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Recent Homework Questions About Statistics
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statistics
Two group of male students cost their past on a particular proposal.the result are as follows: Group infavour against A 128 32 B 96 48 <a> if a student in favour of proposal is selected for a post. What is the probability that he is from group A ? if a student is chosen ...
statistics
The camp dining room has two tables. One that seats 10ppl & the other seats 8ppl. If 4pizzas are placed on the large table & 3 pizzas are placed on the small table. Will both tables recv the same amt of pizzas? How do you solve this equation?
statistics
The camp dining room has two tables. One that seats 10ppl & the other seats 8ppl. If 4pizzas are placed on the large table & 3 pizzas are placed on the small table. Will both tables recv the same amt of pizzas? How do you solve this equation?
statistics
If a value of 64 is given and the standard deviation is 5 what is the range
Statistics
Assume that the sample is taken from a large population and the correction factor can be ignored. The average teacher's salary is $43152. Suppose that the distribution is normal with standard deviation equal to $7000. If we sample 100 teachers' salaries, what is the ...
Statistics
Suppose an automobile association reports that the average time it takes to respond to an emergency call is 25 minutes. Assume the variable is approximately normally distributed and the standard deviation is 4.5 minutes. If 104 calls are randomly selected, approximately how ...
Statistics
When a distribution is mound-shaped symmetrical, what is the general relationship among the values of the mean, median, and mode?
statistics
For a particular sample of 80 scores on a psychology exam, the following results were obtained. First quartile = 65 Third quartile = 98 Standard deviation = 8 Range = 56 Mean = 83 Median = 81 Mode = 59 Midrange = 64 Answer each of the following: I. What score was earned by ...
statistics
I am working on a problem in which you've helped someone else on a z-score percentile problem. I have my z-score and my number from the z-table. I'm trying to input it correct in spss but I'm not sure how to set it up. This is what I have so far... Question:What is...
Psychology
A theory can be defined as: a. an attempt to test behavior and thought process b. an accurate description of problem-solving behavior c. the basis for relationships among facts and principles d. the application of the scientific method through statistics I believe the answer ...
STATISTICS
1. What if the size for each sample were increased to 20? Would a sample mean of 115 or more be considered unusual? Why or why not? 2. Why is the Central Limit Theorem used? 3. Consider situations in your work or home that could be addressed through a continuous probability ...
statistics
Construct a frequency distribution table to organize the following set of data: 44 36 38 40 41 36 39 43 43 35 44 35 43 37 44 37 38 38 40 36
statistics
Suzie watched 47 random movies from each nearby video store. Is this sample of the movies at nearby video stores likely to be representative?
statistics
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?
Statistics
A study was conducted to investigate relationships between different types of standard test scores. On the Graduate Record Examination verbal test, 18 women had a mean of 538.82 and a standard deviation of 114.16, and 12 men had a mean of 525.23 and a standard deviation of 97....
Statistics
For a math assignment we need to design a dice roll game with different expected values of winning. The game should require a player to make a bet on the sum of one roll of two dice. If the dice sum to that number, the player wins; otherwise, he loses. We need to create a fair...
statistics
A researcher is measuring problem-solving times for a sample of n = 20 children. However, one of the children fails to solve the problem so the researcher has an undetermined score. What is the best measure of central tendency for these data?
statistics
the distribution of scores on a test is mound shaped and dsymmetric with a mean score of 78. if 68 percent of the scores fall between 72 and 84, what is the stand deviaition
Math-Statistics-please doublecheck my answers
In the fall of 2000, 54% of the almost 34,000 first-year students attending one of the California State Universities had strong enough math skills to take an entry level course. 1)Based on a sample of 20 students, can we assume our calculations will be accurate? My answer is: ...
statistics
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statistics
The following data lists the average monthly snowfall for January in 15 cities around the US: 20 9 35 46 44 17 32 25 30 14 28 14 9 15 20 Find the mean, variance, and standard deviation. Please show all of your work.
statistics
The following data lists the average monthly snowfall for January in 15 cities around the US: 26 6 5 45 44 10 39 33 15 33 11 36 36 4 32 Find the mean, variance, and standard deviation. Please show all of your work.
statistics
A population is normally distributed with a man of 100 and a standard deviation of 15. is it unusual for themean of a sample of 3 to be 115 or more? Why or why not?
statistics
random samples of 40 drivers average commuting time 0.05 level of significance standard deviation 7.2 and 9.1
statistics
If I need to validate 900 results, what percentage must I check to have 95% confidence the results are correct?
statistics
If the score on a test has a mean of 52 and a standard deviation of 5, what is the z-score for a score of 58
Statistics
A forest fire is burning down a narrow valley 3 miles wide at a speed of 40 feet per minute. The fire can be contained by cutting a firebreak through the forest across the valley. It takes 30 seconds for one person to clear one foot of the firebreak. The value of lost timber ...
statistics
Someone who has never seen a normal die before decides to estimate the mean value of all its faces (μ) by rolling it many times. First, they are told that the standard deviation is σ = 1.7. Then, they roll the die 50 times and get a sample mean of x-bar = 3.7. ...
statistics
you are given 9 to 1 odds aganist tossing three heads with three coins, meaning you win $9 if you succeed and you lose a $1 if you fail
statistics
find the probability of by taking a coin tossed 50 times
Statistics
Two fair six-sided dice are rolled and total of results on the top of each doe observed. Find the probability that total is 8
statistics
Suppose that the mean score of an exam was 77 when taken 30 students took it on time with a standard deviation of 2. A makeup of the same exam is given to 6 students. The retakes averaged a score of 83 with a standard deviation of 2.9. What is the average of the test scores?
Supplementwhat: Misues of statistics.
8. “Vitamin E is a proven antioxidant and may help in fighting cancer and heart disease.” Is there anything ambiguous about this claim?
statistics
Suppose that the mean score of an exam was 77 when taken 30 students took it on time with a standard deviation of 2. A makeup of the same exam is given to 6 students. The retakes averaged a score of 83 with a standard deviation of 2.9. What is the average of the test scores?
statistics
A survey about the art program at a school found that 250 students wanted an after-school art program, 150 students wanted art classes during the day, and 100 students thought that the school should have no art program. If a circle graph were made from this data, what would be...
statistics
What is the probability that the following system works if each unit fails independently with probability p? ____o_____o_____ | | _______o________ | | ____o_____o_____ Note: In the above circuit "o" represents 5 relays in the circuit with propability p
STATISTICS
the percentage of adults who have at some point in their life been told that they have hypertension is 23.53%. If 8 adults are randomly selected, find the probability that between 2 and 4 of then inclusive have been told that they have hypertension
Statistics
. A random sample is selected from a normal population with a mean of __40 and a standard deviation of __10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M _ 42. a. How large a sample is necessary for this sample mean to be...
statistics
What is the alternative hypothesis for a null hypothesis stating that the average time a person keeps a cell phone is at most three years. Answer: Ha: mu > 3 State the null and alternative hypotheses for the following: You are investigating a complaint that "special ...
Statistics-Probability
Consider a binomial random variable X with parameters(4,1/2). Find the conditional probability mass function of X given that X is odd
statistics
In a group of 100 students, 60 are taking math and 12 are taking English, but no one is taking both. What is the probability that a randomly selected student from this group is taking either math or English?
statistics
If a piece of toast falls off your breakfast plate, is it more likely to land with the buttered side down? According to Murphy’s Law (the assumption that if anything can go wrong, it will), the answer is “Yes.” Most scientists would argue that by the law of ...
statistics
Start with x = 100 and add four x values to make a sample of five data such that the standard deviation of these data equals 0.
Statistics
Suppose that the average annual salary for city employees is $36,000 with an SD of $12,000. The city council decides to give everyone a raise of $400 per year. What is the new average salary and the new SD?
Math - Statistics
Eight people in a room have an average height of 66 inches. A ninth person enters the room. How tall would he have to be to raise the average height by 0.5 inches?
Statistics-Probability
Data collected on volcanic eruptions give a mean time between eruptions of 29 months. Assume these eruptions occur as a Poisson process in time, find the: (a) Expected number of eruptions during the five-year period beginning from the time you have read this question. (b) ...
statistics
A researcher wishes to estimate the mean height of women aged between 60 and 65 in the US. She desires a margin of error of 0.2 inches. Past studies suggest that a population standard deviation deviation of 3.2 inches is reasonable. Estimate the minimum sample size needed to ...
statistics
Heights of young adult U.S. women are approximately normal with mean 64" and standard deviation 2.7". What proportion of all U.S. young adult women are taller than 6 feet?
math (statistics)
Suppose you are looking for a job. You interview with a company that has 10 general employees each make $100 per day, 7 assistants each make $400 per day, 3 managers each make $900 per day, and the owner who makes $1900 per day. The interviewer tells you that the average ...
Statistics-Probability
Data collected on volcanic eruptions give a mean time between eruptions of 29 months. Assume these eruptions occur as a Poisson process in time, find the: (a) Expected number of eruptions during the five-year period beginning from the time you have read this question. (b) ...
Statistics
Shown below are the data giving the length of life of lights in an underground tunnel. 9.0 months 7.0 months 8.2 months 8.3 months 7.8 months 8.1 months 7.5 months 7.6 months 9.1 months 7.4 months I calculated the standard deviation to be about 0.679. Estimate the probability ...
Statistics
Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is
statistics
Can someone guide me on how to solve this problem: A sample of 52 night students ages is obtained in order to estimate the mean age of night school students. sample mean = 25.9 years. the population variance is 23. Give a point estimate for the mean. Find the 95% confidence ...
Statistics
Data collected on volcanic eruptions give a mean time between eruptions of 29 months. Assume these eruptions occur as a Poisson process in time, find the: (a) Expected number of eruptions during the five-year period beginning from the time you have read this question. (b) ...
statistics
about 13% of the population is nervous around strangers. If 2 people are randomally seclected, what is the probability that both are nervous around strangers?
Statistics
Select a random sample of 30 student responses to question 6, "How many credit hours are you taking this term?" Using the information from this sample, and assuming that our data set is a random sample of all Kaplan statistics students, estimate the average number of...
Statistics
Select a random sample of 30 student responses to question 6, "How many credit hours are you taking this term?" Using the information from this sample, and assuming that our data set is a random sample of all Kaplan statistics students, estimate the average number of...
statistics
The answer to which of the following questions will produce ordinal data? Answer How much time in minutes does it take you to travel to campus? How many hours do you study every week? What is your height in inches? Please mark the age group that best describes you: 15-19, 20-...
statistics
If we know that the length of time it takes an MBA student to find a parking spot near the DePaul Center follows a normal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute, find the point in the distribution that 75.8% of the MBA students exceed when...
statistics
Suppose that we want to test the claim that the majority (> 50% ) of UOB students read newspapers on a daily basis. We sampled 70 students and found out that 42 of them read newspapers on a daily basis? Test the claim using á=0.10.
statistics
The time required to travel downtown at am on Monday morning is known to be normally distrubted with a mean of 40 minutes and a standard deviation of 5 minute what is the probability that it will take less than 40 minutes?
appl,ied business research & statistics
When would you use Chebyshev’s theorem and the empirical rule in health administration? How are they calculated? Provide one real-life example that requires Chebyshev’s theorem and one that requires the empirical rule.
Statistics
EU (European Union) countries report that 46% of their labor force is female. The United Nations wants to determine if the percentage of women in the U.S. labor force is the same. Representatives from the United States Department of Labor plan to check a random sample of more ...
Statistics
The levels of the Homeland Security Advisory System are listed. Severe High Elevated Guarded Low What data set level of measurement is this? Ordinal, Nominal, Interval, or Ratio?
Statistics
Are Social Security numbers of employees at an accounting firm qualitative or quantitative? Why?
statistics
for the following data, calculate the sampling distribution parameters. u=120, o= unknown, s= 18, n=36
statistics
8. Assume that the MM207 Student Data Set is a random sample of all Kaplan students; estimate the proportion of all Kaplan students who are male using a 90% level of confidence.
statistics
what is the value of P(6,4)?
Statistics Summary
A bakery has an average daily expense of $1350. The standard deviation is $150. The owner takes a sample of 50 bills, what is the probability the mean of his sample will be between $1200 and $1500? how do i solve this
Statistics - Standardizing
I still feel a bit confused, but let's say after all the calculations, I get up to this : P(Z <= -3.36) If I need to look up the normal table, should I change the above to 1 - P(Z >= 3.36) before checking the table? Thank you.
Statistics - Central Limit Theorem
Actually I'm asking this question because I found my answer for the HW question somewhat weird, but I still can't determine where did I make mistakes. Given: A basketball player can score on a particular shot with p = 0.3. Let S be the number of successes out of 25 ...
statistics
A manufacturer knows that their items have a normally distributed length, with a mean of 7.3 inches, and standard deviation of 0.6 inches. If one item is chosen at random, what is the probability that it is less than 5.5 inches long?
statistics
a male children born to women who smoke during pregnancy run the risk of violent and criminal behavior that lasts well into adulthood. can we infer that smoking during pregnancy is responsible for criminal behavior in people?
Statistics-Confidence Interval
Can someone please help me on how to work this out?? I'm so super confused. Thanks! A professor at Kaplan University claims that the average age of all Kaplan students is 36 years old. Use a 95% confidence interval to test the professor's claim. Is the professor's ...
Literacy
6. To avoid plagiarism in your written research paper, you must provide a citation for which of the following? A. The United Nations ruling on the Soviet-bloc countries B. Former President John F. Kennedy's birthday C. Statistics about Web usage you found in the Journal of...
statistics
Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?
statistics
A building has a market value of $229,000.00. If it is assessed at 50% of market value and the tax rate is 40 mills, find the property tax. I got 4,580
statistics
Assume that it takes a college student an average of 5 minutes to find a parking spot in the main parking lot. Assume also that this time is normally distributed with a standard deviation of 2 minutes. Find the probability that a randomly selected college student will take ...
statistics
5. The ages of husbands and wives in a community were found to have a correlation coefficient equal to +0.8; the average of husbands’ ages was 25 years and that of wives’ ages 22 years; their standard deviations were respectively 4 and 5 years. Find the two lines of ...
psychology statistics
15. Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the ...
statistics
a research participant has her brain scanned while listening to music and solving math problems, and the brain area of interest has a percent signal change of 58. From many previous studies with this same math-problems procedure (but not listening to music), it is known that ...
statistics
Start with x = 100 and add four x values to make a sample of five data such that the standard deviation of these data equals 0.
Statistics
The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.9 grams per mile and standard deviation 0.15 grams per mile . (a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile ?
statistics
Mean class scored 74 w/ standard deviation of 4.3. What is range of scores for 68% of class?
statistics
Determine the critical value of t in the following circumstance: 1-alpha=0.99, n=10 t9 = 2.2498 t9 = 3.2498 t9 = 1.2498 t9 = 4.2498
Statistics
I need 28oz of soda and I have 20oz already made what percentage of syrup and carbonated water do I need to get to the 28 oz.
statistics
show that in the binomial distribution (q+p)^n the ratio of the mean deviation about about the mean to standard deviation is 2/(npq)^0.5*n-1 cµ-1p^µ-1 q^n-µ where µ is the greatest integer contained in np+1 . find the limits of the above ratio as n ...
statistics
I'm stuck on a question in MM207... Assume you want to estimate with the proportion of students who commute less than 5 miles to work within 2%, what sample size would you need?
statistics
A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 hours and 900 hours?
statistics
A random sample of 12 joggers was asked to keep track and report the number of miles they ran last week. The responses are: 5.5 7.2 1.6 22.0 8.7 2.8 5.3 3.4 12.5 18.6 8.3 6.6 Compute the three statistics that measure central location
Statistics
The fracture strength of a certain type of manufactured glass is normally distributed with a mean of 579 MPa with a standard deviation of 14 MPa. (a) What is the probability that a randomly chosen sample of glass will break at less than 579 MPa? (b) More than 590 MPa? (c) Less...
Statistics
Daily output of Marathon’s Garyville, Lousiana, refinery is normally distributed with a mean of 232,000 barrels of crude oil per day with a standard deviation of 7,000 barrels. (a) What is the probability of producing at least 232,000 barrels? (b) Between 232,000 and 239,...
statistics
using excel find the variance of a sample of 30 observations selected randomly. Given that the median is 14.7, the mode is 11 and the coefficientof variation is 45%.
statistics
A sudent is analyzing data from an experiment using a linear model. when the student entered the data into his calculator and ran a least squares linear regression the calculator gave a correlation coefficient of 0.01. what can the student infer from this coefficient? 1. the ...
re-post statistics
a weather girl predicts there is a 50% chance of rain and a 10% chance that the rain will turn into snow. What is the probability that it will snow? statistics - Ms. Sue, Friday, January 6, 2012 at 9:08pm What on earth is a "weather girl?" That's what the ...
statistics
one of six radios in a crate is known to be defective. the radios are tested one at a time. if the first two radios are not defective, what is the probability that the third radio tested is defective.
statistics
a weather girl predicts there is a 50% chance of rain and a 10% chance that the rain will turn into snow. What is the probability that it will snow?
probability and statistics
welsh, davis, burke, and williams (2002) conducted a study to evaluate the effectiveness of a carbohydrate-electrolyte drink on sports performance and endurance. experienced athletes were given either s carbohydrate-electrolyte drink or a placebo while they were tested on a ...
probability and statistics
the average age for licensed drivers in the country is u=40.3 years with a standard deviation of o= 13.2 years. a. a researcher obtained a random sample of n=16 parking tickets and computed an average age of m=38.9 years for the drivers. is it reasonable to conclude that this ...
probability and statistics
a population forms a normal distribution with a mean of u=80 and a standard deviation of o=15. for each of the following samples, compute the z-score for the sample mean and determine whether the sample mean is a typical, representative value or an extreme value for a sample ...
probability and statistics
the population of sat scores forms a normal distribution with a mean of u=500 and a standard deviation of o=100. if the average sat score is calculated for a sample of n=25 students. a. what is the probability that the sample mean will be greater than m=510? in symbols, what ...
statistics
You are conducting an experiment to see if a given therapy works to reduce test anxiety in a sample of college students. A standard measure of test anxiety is known to produce a = 19. In the sample you draw of 86 the mean is equal 17.5 with standard deviation s = 10. a- ...
socials
demographer 1. calculate following increases or decreases in population for following countries. Country A Births/1000 = 90 Deaths = 36 Immigrants = 20 Emigrants = 10 I calculate this I get 64/1000 Country B Births/1000 = 75 Deaths = 15 Immigrants = 10 Emigrants = 2 I ...
socials
picture u to open sport store. wat demographic info u wnt to know about ur targt market? how u would use info to choose type of sports products u would hope tosell. what new trends they want to go after. what they most attracted to. i do research abt them, look at statistics ...
statistics
how many different license plates can be made consisting of three letters by four digits?
statistics
A group is studying age distribution of people living in town. The mean age is 45, the modal age is 59, the median age is 56, the range is 96, and the standard deviation is 20.5. Is the data positively or negatively skewed
statistics
a point is randomly selected within the rectangle with vertices at (2,0), (2,2), (-4,2), and (4,0). What is the probability that the point's x-coordinate and y-coordinate are both positive?
statistics
a computer system requires all users to log on using a 6 character password. if each character can be either a digit from 0 to 9 or a letter of the alphabet, what is the number of possible passwords. please show formula used
socials
picture u to open sport store. wat demographic info u wnt to know about ur targt market? how u would use info to choose type of sports products u would hope tosell. what new trends they want to go after. what they most attracted to. i do research abt them, look at statistics ...
socials
definitions developed country: Country with a highly developed economy, with a strong service sector and often an industria base. Citizens have the highest standards of living in the world, with high levels of literacy, health services, and food supplies. some things in here ...
statistics
If there were 10 distribution centers that have an output mean of 78 (in thousands), median of 65 and mode of 50, what would be the total output of the distribution centers?
statistics
If there were 10 distribution centers that have an output mean of 78 (in thousands), median of 65 and mode of 50, what would be the total output of the distribution centers?
statistics
The abc shoe factory manufactures shoes 24 hours a day. the workers produce 50,000 shoes every 2.3 days How many hours does it take to produce 50,000 shoes
statistics
Use the data given in table 13.1 on page 846 to construct a frequency distribution with a first class ( in ten thousands ) of 150-296.
Prob. & Statistics
If one event, say Black, has P(.70) and another event, say Red, has P(.30). What is the probability in ten events of alternating choices, Red then Black, and being 100% correct, 90% correct. What should be the expected % correct and what is the standard deviation?
statistics
marbles come in 10 different varieties and there are 15 marbles in a pack.how many packs must a person buy in order to be sure of having at least 10 of one kind?
statistics
A college professor believes that students take an average of 15 credit hours per semester. A random sample of 24 students in his class of 250 reported the following number of credit hours that they were taking: 12,13,14,14,15,15,15,16,16,16,16,16,17,17,17,18,18,18,18,...
Statistics
2. You are given the following data. Number of Absences Final Grade 0 93 1 90 2 79 3 66 4 60 5 56 - Find the correlation coefficient for the data. - Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days. Show all ...
statistics
Use the given confidence level and sample data to find a confidence interval for the population standard sigma. Assume that a simple random sample has been selected from a population that has a normal distribution. salaries of college graduates who took a geology course in ...
statistics
A department store management claims that families spend an average of $625 on gifts during the Christmas season. A sample of 120 families showed that they spent an average of $665 on gifts during the past Christmas season with a standard deviation of $135. Test at the 10% ...
statistics
According to a Louis Harris poll, 63% of men drivers always use seat belts. A recent sample of 900 men drivers showed that 60% of them always use seat belts. Test at the 1% significance level if the proportion of men drivers who always use seat belts is less than .63
statistics
A sample of 400 high school students showed that they spend an average of 70 minutes a day watching television with a standard deviation of 14 minutes. Another sample of 500 college students showed that they spend an average of 55 minutes a day watching television with a ...
statistics
2. Classify the following variable as nominal, ordinal, discrete, or continuous and state why it is such a variable: number of automobile accidents per year (Points : 3)
statistics
P(proportion) is 0.05446, n is 863 and a 90% confidence interval is required. What is this confidence interval?
statistics
3. Nationally, the distribution of weapons used in robberies is as shown in the table along with the weapon used in 1652 robberies on school property. Weapon Overall 1652 Robberies Gun 0.42 329 Knife 0.09 122 Strong-arm 0.40 857 Other 0.09 344 Does the distribution of weapons ...
statistics
Below are the top 20 U.S. football teams in the seventh and eighth weeks of the 2003 season, along with the points awarded to each team by the ESPN/USA Today coaches poll. Research question: At á = .01, based on this data, is there a significant rank correlation between...
AP STATISTICS
Mens shirt sizes are determined by neck sizes. suppose the mens nexck sizes are approximatley normally distributed with mean 15.7 inches and standard deviation 0.7 inch.retailer sells men shirts in S,M,L,XL where the shirt sizes are defined in the table below. S: 14 ≤ ...
statistics
the assets (in billions of dollars)of the four wealthiest people in a particular country are 46,34,12,10. Assume that the samples of size 2 are randomly selected with replacement from this population of four values. After listing the possible sample and finding the mean of ...
Statistics
suppose the correla tion between SAT Verbal scores and Math scores is .57 and that these scares are normally distributed. IF a student's Verbal score places her at the 90th percentile, at what percentile would you expect her Math scores to be?
statistics
the life of electric bulbs has a normal distribution with a mean of 35 months and a standard deviation of 4 months. What should the warranty period be if the company that manufactures these bulbs does not want to replace more than 2% of the bulbs?
statistics
The following are all quiz scores of a student in a statistics course. Each quiz was graded on a 10-point scale. 10,6,7,6,5,8 Assuming that these scores constitute an entire population, find the standard deviation of the population. Round your answer to at least two decimal ...
Science
A repair shop tested two methods(a & B) of replacing a broken roller. In testing method A, these times in minutes were measured (5 trials), 2,4,9,3,2. In testing methods B, these times in minutes were measured (6 trials), 3,7,5,8,4,3. Use the 0.10 significance level, and ...
statistics
Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?
SMU
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with a standard ...
statistics
you are asked to estimate the average weight of an adult male passenger for a study to maximize the number of seats in a certain airplane. you collect random weights of 1000 men passengers from a population of 100,000. you find that the average man in the sample weighs 180 ...
statistics
Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 400 and a standard deviation of 100. Find the probability that a student will score over 500.
statistics
a distribution of scores has 6, but the value of the mean is unknown, a researcher plans to select a sample from the population in order to learn more about the unknown mean, if the sample consist of n= 9 scores , how accurately should sample mean represent the population mean
statistics
Do you think there is a correlation between CEO salaries and the degree of success of a company? If you were to take a sample of companies with comparable size, market capitalization, and product category, and plot CEO salaries against the net profit of their respective ...
Statistics
6. If we reject H0:µ = 10 in favor of Ha:µ 10 at a given level of significance with a positive value of the test statistic z, then if we test H0:µ = 10 versus Ha:µ > 10 using the same sample, Ha:µ > 10 will ______ be rejected at the same ...
statistics
suppose a company receives 60% of its order the internet. what is the probability that the fifth order received is the first internet order? what is the probability that the eight order received is the fifth internet order?
statistics
A study is discussed the purity of oxygen from a certain supplier. Assume that the mean was 99.61 with a standard deviation of 0.08. Assume that the distribution of purity was normal. Below what purity value would you expect to represent the smallest 25% of the population?
statistics
Twenty percent of all adult males did not visit their physicians’ offices last year. The probability that less than 23% of adult males in a sample of 800 did not visit their physicians' offices last year is approximately:
AP Statistics
Nurse practitioners are nurses with advanced qualifications who often act much like primary care physicians. Medical researchers wnat to design a study to compare the effectiveness of nurse practitioners and physicians. They recruit 1200 volunteer subjects for the tudy, each ...
statistics
The times taken to complete a statistics test by all students are normally distributed with a mean of 120 minutes and a standard deviation of 12 minutes. Find the probability that the mean time taken to complete this test by a random sample of 16 students would be between 122 ...
statistics
The times taken to complete a statistics test by all students are normally distributed with a mean of 120 minutes and a standard deviation of 12 minutes. Find the probability that the mean time taken to complete this test by a random sample of 16 students would be between 122 ...
statistics
What is the probability that the student is from UCLA or chooses football
statistics
the admissions policy at a certain university requires that incoming students score in the upper 20% on a standardized test. if the mean score on the test is 510 and the standard deviation of the scores is 80, what is the minimum score that a student can earn on the test to ...
statistics
the admissions policy at a certain university requires that incoming students score in the upper 20% on a standardized test. if the mean score on the test is 510 and the standard deviation of the scores is 80, what is the minimum score that a student can earn on the test to ...
Statistics
Assume that 150 scores are normally distributed with a mean of 92 and a standards deviation of 11.5 WHat percentage of the scores fall between 69 and 115?
Algebra: Statistics
Five years ago, you bought a house for $151,000, with a down payment of $30, 000, which meant you took out a loan for $121,000. Your interest rate was 5.75% fixed. You would like to pay more on your loan. You check your bank statement and find the following information. ...
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