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Recent Homework Questions About Statistics
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precal
The Census Bureau reported that the population of the United States in 1995 was 262.9 million. Referring to the statistics on the second page of the Background Information for Project 4, how many crimes committed in 1995 occurred in the South? The statistics were: with a popul...
STATISTICS
DEPENDENT MEANS OF EXPERIMENTAL GROUP OF 20, MEANS OF 38, STD 3, CONTROL GROUP OF 30, MEANS 35, STD 5- SIGNIFICANCE LEVEL OF .05 IN HYPOTHESIS TESTING FORMAT
precal
You can find the size of a population after t years using the formula N = No(1 + r)^t where No is the initial size of the population, N is the final size of the population, r is the rate of growth or decay per time period, and t is the number of time periods. Use this formula ...
statistics
A population of N=8 scores has a mean of µ = 20. If one score is changed from X=14 to X=50, what will be the value for the new mean?
statistics
A population of N=8 scores has a mean of µ = 20. If one score is changed from X=14 to X=50, what will be the value for the new mean?
planning
Ms. Sue, you told me last time to search up my college to see what courses are required for hygienist, and so this is what I got. 2. The course choices that I make today lead to the fulfillment of this dream by them providing all the knowledge that I need to know to become wha...
statistics
• Prepare a 700- to 1,050-word paper in which you interpret the statistical significance of a study.
Statistics
One of the tests for Outlier is anything greater or smaller than 1.5 IQR. Why is 1.5 chosen to be the benchmark, instead of 2 or 1 IQR?
COM 155
I am to label each paragraph as either: Summary, Analysis, Synthesis, and Evaluation. I am confused by #2 and #4 can someone please check my answers 1. Alice Axia’s article discussed overlooked tax deductions. It talked about some of the most commonly missed deductions. ...
Statistics
Calculate each binomial probability: a. Fewer than 4 successes in 12 trials with a 10 percent chance of success. b. At least 3 successes in 7 trials with a 40 percent chance of success. c. At most 9 successes in 14 trials with a 60 percent chance of success. d. More than 10 su...
Statistics
Calculate each binomial probability: a. X = 2, n = 8, ð = .10 b. X = 1, n = 10, ð = .40 c. X = 3, n = 12, ð = .70 d. X = 5, n = 9, ð = .90
Statistics
A lottery ticket has a grand prize of $28 million. The probability of winning the grand prize is .000000023. Based on the expected value of the lottery ticket, would you pay $1 for a ticket? Show your calculations and reasoning clearly.
STATISTICS
Can a ANOVA be compared to a blood test?
U.S. statistics
What is the least populated state in the United States today? My best guesses would be Rhode Island, Alaska, or Hawaii.
statistics
A simple random sample of 25 has been collected from a normally distributed population for which it is known that 17.0. The saMPLE MEAN HAS BEEN CALCULATED AS 342.0 AND THE sample standard deviation s=14.9. Construct and interpret the 95% and 99% confidence intervals for the p...
Statistics
What is the difference between the null and alternative hypotheses statements in one-tailed and two-tailed tests? How can manufacturing companies use the standard normal distribution to determine quality control of their products?
AP Statistics (math)
Find a set of numbers that will satisfy the following conditions: - the median of a set of 20 numbers is 24. - the range is 42. - to the nearest whole number the mean is 24. - no more than three numbers are the same.
math
The United Nation declared that the world's six-billionth inhabitant was born on October 12, 1999 in Bosnia. Don't discuss what is not said. Discuss what is said. what is wrong with this statement according to what is allowed in statistics?
statistics
. A statistician needs to survey a sample of 50 people that is representative of voters in his community. He prepared a list of phone numbers of 50 randomly selected, expected voters. Next morning, he came to work at 8:00 and began to make calls. By 11:00 a.m., his survey was ...
fiance
Use the following statistics from Robert Morris Associates' Annual Statement Studies to answer the following question(s). Net sales 100.0 percent Cost of sales 59.9 percent Gross profit 40.1 percent Operating expenses 31.2 percent Net profit (before taxes) 8.9 percent Usin...
statistics
The standard deviation of a distribution is 28. If a sample of 289 is selected, what is the standard error of the mean?
statistics
What is the value for for a 95% confidence interval for the sample variance when n=10?
statistics
Use the random-number table to simulate the outcomes of tossing a quarter 25 times. Assume that the quarter is balanced (i.e., fair). (Start at row 1, and let 0, 1, 2, 3, 4 indicate heads and 5, 6, 7, 8, 9 indicate tails. Enter H for heads and T for tails, and enter your answe...
statistics
A researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff "t" needed is -1.8333. The standard deviation of the distribution of me...
Statistics
In a study to estimate a population mean, i start with a sample size 10 and calculate the 95% confidence interval. Suppose i am not satisfied with the size of the confidence interval and want to reduce it by half. Give an estimate of sample size that i need.
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
2. The director of admissions at a large university advises students that the cost of textbooks will average more than $300 for a typical semester. A random sample of 80 students enrolled in the university shows a sample mean cost of $315.40 and a sample standard deviation of ...
statistics
Why am I stuck? How do I figure I must be really stressed because I cannot figure this out. you exmple 9.408^2 =88.51046? How do you get it? I have squared 9.408 on calculator and get 3.08 what am I missing?
statistics
Construct two different datasets such that the range of the first set is greater than the range of the second set, but the standard deviation of first set is less than the standard deviation of the second set. Can you say that one of your datasets has the smaller variation of ...
english
please give me an oratorical piece about statistics..
statistics
It is thought that prehistoric Indians did not take their best tools, pottery, and household items when they visited higher elevations for their summer camps. It is hypothesized that archaeological sites tend to lose their cultural identity and specific cultural affiliation as...
statistics
Use the list of random numbers given below to simulate the outcomes of tossing a quarter 11 times. Assume that the quarter is balanced (i.e., fair) and an even digit is assigned to the outcome heads (H) and an odd digit to the outcome tails (T). 9 1 9 7 2 3 9 8 0 0 4
Statistics
63.4 65.0 64.4 63.3 54.8 64.5 60.8 49.1 51.0 Assume that these observations are an SRS from the late Cretaceous atmosphere. What is the mean percent of nitrogen in ancient air with a 90% confidence level? Hint: uses one-sample t confidence
statistics
Suppose that about 20% of those called will find an excuse (work, poor health, travel out of town, etc.) to avoid jury duty. If 14 people are called for jury duty, what is the probability that all 14 will be available to serve on the jury? Round your answer to three decimal pl...
statistics
Is the magnitude of an earthquake related to the depth below the surface at which the quake occurs? Let x be the magnitude of an earthquake (on the Richter scale), and let y be the depth (in kilometers) of the quake below the surface at the epicenter. Suppose a random sample o...
statistics
Find the sample variance s2 for the following sample data. Round your answer to the nearest hundredth. x: 23 17 12 35 29 a. 84.20 b. 67.36 c. 101.00 d. 88.84 e. 126.25
statistics
Consider the data that was obtained from a random sample of 45 credit card accounts. Identify all the averages (mean, median, or mode) that can be used to summarize the outstanding balance on each account. a. mean, median, and mode if it exists b. only median if it exists c. o...
statistics
The director of the campus-computing center did a study to determine the patterns of student computer usage. He found that 15% of the total student computer hours occurred during the first 5 weeks of the term, 25% during the middle five weeks, and 60% during the last 5 weeks. ...
statistics
Find the sample variance s2 for the following sample data. Round your answer to the nearest hundredth. x: 23 17 12 35 29
statistics
without the use of the standard normal tables, should techniques of calculus be used to find the probabilities concerning a normal distribution?
statistics
what is the most likely answer for the confidence coefficient of linear correlation if x = the number of hours spent studying for a test, and y = the number of points earned on the test?
statistics
the random variable x is normally distributed with a mean of 75 and a standard deviation of 15.0. For this distribution, what is the twenty-third percentile?
Statistics
Assume the body temperature of healthy adults are normally distributed with a mean of 98.2F and a standard deviation of 0.62F. If you have a body temperature of 99.00F, what is your percentile score? Convert 99.00F to a standard score(or a z-score). Is a body temprature of 99....
statistics
using the 68- 95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard diviation of 20. Use the 68-95-99.7 rult to find the following quantities: percentage of scores less than 100 relative frequency of scores less than 120. perc...
statistics
A normal distribution is any distribution that is not unusual. True or false?
statistics
Given the following scatter diagram , the sample correlation coefficient r: Has a positive linear correlation Has a negative linear correlation. Has little or no correlation. Looks close to + 1.00
statistics
if the equation for the regression line is y1=6x-8,what is the result in a predicted value for y if the value of x =4
statistics
Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for the Vanguard Total Stock Index (all Stocks). Let y be a random variable representing annual return for the Vanguard Balanced Index (60% stock and 40% ...
statistics
What is meant by the 95% confidence interval of the mean ? That 95% of my sample is OK to do more tests. That I am 95% confident that the confidence interval will contain the parameter being estimated. That 5% of my sample is not OK. That I am 95% sure that the population mean...
statistics
2. Assume that the population proportion of adults having a college degree is 0.35. A random sample of 200 adults is to be selected to test this claim. A) What is the shape, mean, and standard deviation of the sampling distribution of the sample proportion for samples of size ...
statistical psychology
Do students at various universities differ in how sociable they are? Twenty-five students were randomly selected from each of three universities in a region and were asked to report on the amount of time they spent socializing each day with other students. The result for Unive...
Statistics
How many ways are there to choose a three-digit lottery number? Note that numbers like 003, 014, 222, 232 or 123 are all allowed.
statistics
GIVEN THE FOLLOWING STATISTICAL VARIABLES A:m(A)=5 B:m(B)=13 var(A)=25 Var(B)=6 1.calculate mean of Z= 4B-2A 2.Calculate the Standard Deviation assuming cov (A,B)=0
statistics
Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20 °F and a standard deviation of 0.62 °F (based on data from the University of Maryland researchers). a. If you have a body temperature of 99.00 °F, what is your percentile s...
statistics
Using the 68-95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: Suggest you make a drawing and label first… a. Percentage of scores less than 1...
statistics
which of the following statements are correct? a. a normal distribuiton is any distribution that is not unusual. b. the graph of a normal distribution is bell-shaped. c. if a population has a normal distribution, the mean and the median are not equal. d. the graph of a normal ...
Statistics
I don't know where to start with this in Excel. Player Rating TD% Inter% Steve Young 96.8 5.6 2.6 Kurt Warner 95.7 5.5 3.5 Daunte Culpepper 93.2 5.4 3.1 Peyton Manning 92.3 5.6 3.1 Joe Montana 92.3 5.1 2.6 Trent Green 87.9 4.7 2.9 Tom Brady 87.5 4.8 2.6 15.34 For the data ...
statistics
A researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff "t" needed is -1.8333. The standard deviation of the distribution of me...
statistics
A researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff "t" needed is -1.8333. The standard deviation of the distribution of me...
statistics
If a data set has a mean of 10.0 seconds and a standard deviation of 2.0 seconds, what is the Z score corresponding to the time of 4.0 seconds?
Statistics
. Using Excel, find the t-score that corresponds to the following Confidence Levels and Sample Sizes: a. 95% with n = 25 b. 96% with n = 15 c. 97% with n = 21 d. 91% with n = 10
statistics
indicate whether the given statement could apply to a data set consisting of 1,000 vlaues that are all differnt. a. the 29th percentile is greater thatn the 30th percentile b. the median is greater thatn the first quartile c. the third quartile is greater than the first quarti...
statistics
Annual household incomes in a certain region have a distribution that is skewed right, with mean 30.25 thousand dollars and a standard deviation of 4.50 thousand dollars. If a random sample of 100 households is taken, then the probability that the sample mean ¯ x will be ...
statistics
A data set consists of a set of numerical values. Which, if any, of the following statements could be correct? a. There is no mode. b. There are two modes. c. There are three modes.
statistics
Given a sample size of 38, with sample mean 660.3 and sample standard deviation 95.9 we are to perform the following hypothesis test. Null Hypothesis H0: ƒÊ = 700 Alternative Hypothesis H0: ƒÊ ‚ 700 At significance level 0.05 3. Calculate the t...
statistics
In Los Angeles there are three network television stations, each with it own evening news program from 6:00 to 6:30 PM. According to a report in this morning’s local newspaper, a random sample of 150 viewers last night revealed 53 watched the news on KNBC (channel 2), 64 ...
statistics
Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc tests.
statistics
Formulate a hypothesis statement and perform the five-step hypothesis testing procedure
statistics
In a contest in which 8 contestants are entered, in how many ways can the 5 distinct prizes be awarded?
statistics
In a class of 50 students, 31 are Democrats, 13 are business majors, and 3 of the business majors are Democrats. If one student is randomly selected from the class, find the probability of choosing a Democrat or a business major.
statistics
We believe that 77% of the population of all Business Statistics I students consider statistics to be an exciting subject. Suppose we randomly and independently selected 40 students from the population. If the true percentage is really 77%, find the probability of observing 39...
Statistics
Here are heart rates for a sample of 30 students before and after a class break. At á = .05, was there a significant difference in the mean heart rate? Heart Rate Before and After Class Break (a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find ...
Statistics
a random sample of 10 minature tootsie rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were 3.087, 3.131,3.241,3.270,3.353,3.400,3.411,3.437,3.477 a.) construct a 90 percent confidence intervalfor the true meam weight. b...
MTH233/statistics UOP
You work for the public relations department of the Social Security Administration. In an effort to design better advertising campaigns, your department decides to conduct a survey to find out the opinions people in the United States have about the Social Security system. One ...
Statistics
Thomas economic forecasting, Inc. and Harmon econometrics have the same mean error in forecasting the stock market over the last ten years. However, the standard deviation for Thomas is 30 points and 60 points for harmon.At the .05 signifcance level can we conclude that there ...
math
"ThermoStar has been producing residential thermostats for over 50 years. Looking over the past 20 quarters (5 years) of the different product lines, the general manager has been trying to get a handle on sales, costs, and production, and has asked for your help. Your res...
statistics
1.For 10 pairs of data, the correlation coefficient is computed to be r = -1. Wht do you know about the scatter diagram? 2.You are considering the most expensive purchase that you are likely to make: the purchase of a home. Identify at least five different variables that are l...
algebra
This is actually part of a statistics problem I'm working but I forgot how to do this and if someone can refresh my memory, I might be able to solve these. The problem is with factorials. 20! / 5! (20-5)! I know I can reduce and cancel, but how and where? If I do 20! / 5! ...
Statistics
Many women take oral contraceptives to prevent pregnancy. Under ideal conditions, 1% will become pregnant within one year. In typcal use, 5% become pregnant. Choose 20 random women taking the pill. How many become pregnant in the next year? a. What is the probability that at l...
Statistics
If many random samples of 64 students who took the second midterm examination in Math 10 are taken, what is the 95th percentile of the average time to completion for these samples? Explain what this number means.
cultural diversity
what do statistics reveal about Asian diversity in America?
Statistics
a score of 10 indicates severe depression, while a score of 0 indicates no depression. From reports, she is able to find out about past testing. Fourth graders at her school usually score 5 on the scale, but the variation is not known. Her sample of 20 fiftsh graders has a mea...
statistics
Is a score of 35.6 unusual? why or why not?
statistics
Test scores on the ACT exam are normally distributed with a mean of 211 and deviation of 4.8. Using the 68-95-99.7 rule, find the percentage of ACT scores within 9.6 of the mean of 21.1, and 14.4 of the mean of 21.1
MTH233/statistics UOP
. Hypothesis Testing o Please complete the following 5-step hypothesis testing procedure in your Learning Teams: A simple random sample of forty 20-oz bottles of Coke® from a normal distribution is obtained and each bottle is measured for number of ounces of Coke® in t...
Essentials of statistics
A populations of scores forms a normal distribution with a mean of 40 and a standard deviation of 12 what is the probability of selecting a sample of n=9 scores with a mean less than m=34
college
Essentials of statistics is the subject and the question is: The population of IQ scores forms a normal distribution with a mean of u=100 and a standard deviation of sigma=15. What is the probability of obtaining a sample mean greater than M=105 for a random sample of n=36 peo...
MTH233/statistics UOP
Please complete the following 5-step hypothesis testing procedure in your Learning Teams: A simple random sample of forty 20-oz bottles of Coke® from a normal distribution is obtained and each bottle is measured for number of ounces of Coke® in the bottle. The sample m...
statistics
Three cards are drawn from a deck without replacement. Find these probabilities. a)all are jacks b)all are clubs c)all are red cards
statistics
if 25% of U.S. federal prison inmates are not U.S. citizens, find the probility that two randomly selected federal prison inmates will not be U.S. citizens.
statistics
if 18% of all Americans are underweight, find the probability that if three Americans are selected at random all will be underweight.
Statistics
Which of the following mathematical relationships could be found in a linear programming model? Choose YES if the relationship could be, and NO if it could not. A. YES B. NO 1. B-2A + 7B = 45 2. 4A - B less than or equal to 10 3. A + \ 2B greater than or equal to 22 4. 3A + 2...
math
Ok. I pretty much have this one solved but the final answer has me stumped. The probability that Luis will pass his statistics test is 0.51. Find the probability that he will fail his statistics test. This is what I have so far. P(fail)=.51; =1-.51. But I am not sure of the fi...
Probability & Statistics
A basketball player shoots free throws and makes them with probability 1/3. What is the probability the player will miss three in a row?
Statistics
a. Find the mean, median, and range for each of the two data sets. b. Find the standard deviation using the rule of thumb for each of the data sets. c. Compare the two sets and describe what you discover. The following data sets shows the ages of the first seven presidents (Pr...
statistics
A researcher interested in relationships developed a questionnaire that measures the degree of affection adult men feel for their fathers. She has found that for the general population the distribution is skewed to the right, the mean degree of affection is 60, and the standar...
Statistics
Car P(Sale) % Sold Per Sale/ Profit Per Sale VW Golf 10% 15% $1,000 Saab 10% 15% $2,000 BWM Z4 10% 20% $12,000 Skoda Octavia10% 10% $1,200 Lada Niva10% 40% $400 Sum 100% 2.1 What is the expected profit for a VW Golf? 2.2 What is the expected profit for a Saab? 2.3 What is the...
MTH233/statistics UOP
A car company says that the mean gas mileage for its luxury sedan is at least 21 miles per gallon. You believe the claim is incorrect and find that a random sample of five cars has a mean gas mileage of 19 miles per gallon and a standard deviation of 4 miles per gallon. Assume...
MTH233/statistics UOP
Clickfraud has become a major concern as more and more companies advertise on the Internet. When Google places an ad for a company with its search results, the company pays a fee to Google each time someone clicks on the link. That’s fine when it’s a person who’...
statistics
The heights of 1000 students in a college are normally distributed with a mean 5’10” and SD 2”. Find the approximate number of students in each range of the heights: 1) 5’8”-6’ 2) 5’6”-6’2” 3) Above 5’10” 4) Below 6&#...
Statistics
Let’s continue our analysis of liberals and conservatives, taking a look this time at differences in their educational attainment. We obtain the following information from the 2002 GSS – the average educational attainment for liberals is 13.90 years (SY = 3.27) and t...
statistics 3
Exercise #4 Quality control problem: According to U.S. News & World Report, a laboratory in Atlanta is processing snake venom for use in medical research. Five processing methods are being tested to determine which is least likely to contaminate the processed venom. If a venom...
statistics 2
A Keynesian Consumption Function: In his famous 1936 book, A General Theory of Employment, Interest and Money, the noted British economist John Maynard Keynes proposed a theoretical relationship between income and personal consumption expenditures. Keynes argued that as income...
Statistics
Exercise #2 As a marketing analyst for Imperial Products, your task is to determine if a new product is worth marketing nationwide. The director of marketing has stated that at least 85percent of the public must express some desire for the product and, for those who exhibit an...
Statistics
For a normal distribution with a mean of m = 80 and a standard deviation of s = 20, find the proportion of the population corresponding to each of the following scores. a. Scores greater than 85 b. Scores less than 100 c. Scores between 70 and 90 I believe this is the correct ...
statistics
In the July 29, 2001, issue of The Journal News (Hamilton, Ohio) Lynn Elber of the Associated Press reported on a study conducted by the Kaiser Family Foundation regarding parents’ use of television set V-chips for controlling their children’s TV viewing. The study a...
Statistics
3. Indicate whether the given statement could apply to a data set consisting of 1,000 values that are all different. a. The 29th percentile is greater than the 30th percentile. b. The median is greater than the first quartile. c. The third quartile is greater than the first qu...
Statistics
If a completion time for a task is normally distributed with a mean of 15 seconds and a standard deviation of 2.5 seconds, what is the probability of getting a time less than 9.7 seconds?
Statistics
What is the stardard deviation using the rull of thumb for each set of numbers: 57,61,57,57,58,57,61 61,52,69,64,46,554,47
statistics
Using the 68-95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: Suggest you make a drawing and label first… a. Percentage of scores less than 1...
Statistics
Hello...I need help with the following question, I have the answer but am not sure how to solve it. Any help would be greatly appreciated. Thank you What is the 'z' value assuming the normal distribution applies in a right-tailed test within area equal to .01? Answer: ...
statistics
Let x be a random variable representing dividend yield of Australian bank stocks. We may assume that x has a normal distribution with sigma =2.3%. A random sample of 17 Australian bank stocks has a sample mean of x bar 7.74%. For the entire Australian stock market, the mean di...
Statistics
The Academy of Orthopedic Surgeons states that 80% of women wear shoes that are too small for their feet. A researcher wants to be 98% confident that this proportion is within 3% of the true proportion. How large a sample is necessary?
statistics
find the sample variance s2 for the following sample data. Round to the nearest hundred x: 23 17 12 35 29
MTH233/statistics UOP
Industry 1980 1997 Agriculture 290 727 Mining 994 586 Construction 4,473 5,513 Manufacturing 21,165 18,633 Transportation 4,623 6,247 Trade 20,258 28,813 Finance and Insurance 5,295 7,367 Services 17,186 37,380 • • The table above shows the number of employees, in th...
MTH233/statistics UOP
• Best Practices has the following caveats: • • Use a bar chart to show the frequencies of a categorical variable. • • Use a pie chart to show the proportions of a categorical variable. • • Preserve the ordering of an ordinal variable. •...
MTH233/statistics UOP
A manager has portioned the company’s sales into six districts: North, East, South, Midwest, West and International. What graph or table would you use to make the points below in a presentation for management? 1. A figure that shows the slightly more than half of all sale...
MTH233/statistics UOP
Find one quantitative and one qualitative data set from a reliable source and determine the best way to present that data graphically. Show your graph and explain your reasoning for choosing this presentation method. When might the reported median of data be more appropriate t...
math/everything
do you know any website that can help me with all this 1.Language Arts, Writing, in two parts. •Part 1: Organization, Sentence Structure, Usage, and Mechanics •Part 2: Essay 2.Language Arts, Reading •Poetry •Drama and •Fiction •Non-fiction •W...
Data and statistics
If a student had a z score of 2.5 for IQ, whar is his actual IQ? The IQ mean is 100, and standard deviation is 15.
Data and statistics
Calculate the z score for an SAT Verbal score of 510, mean of 500, and standard deviation of 100.
Data and Statistics
Calculate the z score for an ACT score of 12, a mean of 20, and the standard deviation is 5.
statistics
1.On a test the mean is 75 and the standard deviation is 5. A. What is the probability that a randomly selected score is higher than 80? B. What percentage of the students scored higher than 80? C. What percentage of the scores were less than 68? D. What score separates the to...
statistics
Assume that a set of test scores is normally distributed with a mean of 100 and a standard devaiton of 20. Use teh 68-95-99.7 rule to find the following quantities: a. percentages of scores less than 100 b. relative frequency of scores less than 120 c.percentage of scores les...
immediate help needed statistics one tailed hypo
the average weekly earnings of a production worker were $424. to know if wages, on average, have gone up since that time. To test this, you sample 64 production workers, and determine that their average salary is $432.69, with a sample standard deviation of $33.90. Use a 0.05 ...
statistics z or t test
the average weekly earnings of a production worker were $424. to know if wages, on average, have gone up since that time. To test this, you sample 64 production workers, and determine that their average salary is $432.69, with a sample standard deviation of $33.90. Use a 0.05 ...
statistics
what is the probability of 62 with a mean of 60 and a standard deviation of 7?
statistics
Complete the hypothesis test: null hypothesis = 52, alternative hypothesis =<52, a=0.01 usin data set 45,47,46,58,59,49,46,54,53,52,47,41
statistics
M&M plain candies have weights that are normally distrbuted with a mean weight of 0.8565 gram and a standard deviation of 0.0518 gram. A random sample of 100 M&M candies is obtained from a package containing 465 candies: the package label states that the net weight is 396.9 gr...
statistics
the average weekly earnings of a production worker were $424. to know if wages, on average, have gone up since that time. To test this, you sample 64 production workers, and determine that their average salary is $432.69, with a sample standard deviation of $33.90. Use a 0.05 ...
statistics t test
how to know exact t value using sample standard deviation and sample mean and sample size i think df is sample size -1 . we usually use approx value but to use exact value how to use t score table. and how we conclude whether it is two tailed test or one tailed test . (i f the...
INB 205
Wal-Mart Taking on the World Minicase Thank you Ms Sue. Now I need to find: Some statistics in regard to GNP and future growth potential for expanding Wal-Mart into India. What are the Government and Public Attitudes about American Products? Promotional Methods specific to Ind...
statistics
A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the ...
statistics
1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around t...
Statistics
Suppose a certain species bird has an average weight of xbar 3.40 grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with sigma 0.29 grams. Find the sample size necessary for a 98% confidence level with a maximal error of...
statistics
The time it takes to give a man a shampoo and haircut is normally distributed with a mean of 22 minutes and standard deviation of 3 minutes. Customers are scheduled every 30 minutes. (a) What is the probability that a male customer will take longer than the allocated time? *(b...
statistics
The probability that a 30-year old white male will live another year is .99842. What premium would an insurance company charge to break even on a 1-year $1 million dollar term life insurance policy?
Statistics
Half of a set of the parts are manufactured by machine A and half by machine B. Four (.04) of all the parts are defective. Six percent (6%) of the parts manufacture on machine A are defective. Find the probability that a part was manufactured on machine A, given the part is de...
Statistics
1. For the following exercise, complete the following: a. Find the mean, median, and range for each of the two data sets. b. Find the standard deviation using the rule of thumb for each of the data sets. c. Compare the two sets and describe what you discover. The following dat...
statistics
1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around t...
Statistics
Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20 °F and a standard deviation of 0.62 °F (based on data from the University of Maryland researchers). Bellevue Hospital in New York City uses 100.6 °F as the lowest temperatu...
statistics
Among the contestants in a competition are 44 women and 26 men. if 2 winners are randomly selected, what is the probabilty that they are all men?
Statistics
Which of the following statements are correct? 1.A normal distribution is any distribution that is not unusual. 2.The graph of a normal distribution is bell-shaped. 3.If a population has a normal distribution, the mean and the median are not equal. 4.The graph of a normal dist...
statistics
What type of data must you collect to conduct a t-test? Why?
statistics
Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: Suggest you make a drawing and label first… a. Percentage of scores less than 100 b. Relative frequency of...
Statistics
What is the difference between parametric and nonparametric statistical tests?
math
Week 4: Exercises from E-Text 12. Individual Assignment: Exercises From the E-Text Due 7/12/10 • Resource: Applied Statistics in Business and Economics • Prepare answers to the following exercises from the Applied Statistics in Business and Economics e-text: o Chapte...
statistics
Give an estimate for each expression in Exercises, Then state whether you believe that the exact answer is greater than or less than the estimate. Explain how you decided. Use a calculator to check the accuracy of your estimate. 978 X 66
Research
Define the terms “valid” and “reliable” as they relate to statistics. Can a test be reliable and not valid or vise versa? Why or why not?
Statistics
First 7: 57 61 57 57 58 57 61 Second 7: 61 52 69 64 46 54 47 2. Any given data set consists of a set of numerical values. Please indicate by stating yes or no for each of the following statements whether or not it could be correct for any data set. (This question is not referr...
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