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Statistics

Math, Statistics
If P(A)=.3 and P(B)=.45 find… P(A or B) if A and B are 1)mutually exclusive & 2)independent. Also, I need help understanding what independent and mutually exclusive means and what that does.

Statistics
If the standard deviation of a sample is 12 inches, then the variance is 144 sq. inches. Do you agree? Can you try?

Mental Health
If the correlation between one’s interest in statistics and being a “fun date” was –0.70, it would mean that: a. The higher someone’s interest was in statistics, the more likely it would be that he or she is a fun date b. The higher someone’s interest was in ...

behavior health
According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test? a. 0.40 b. 0.50 c. 0.80 d. 0.90 I selected C for my answer 40/50 is the .80 If the correlation between one’s interest in ...

Statistics
An observation was drawn from a normally distributed population with mean 2.397 and standard deviation 0.612. If the observed value is 3.144, find the z-score.

PsyDAG How can i inteview you?
remember that statistics assignment of ours? pleaseee

Data analysis statistics and probability
6. If the average temperature in February was 55°F arch was 64°F April was 74°F, and Ma was 85°F men which month had the smallest gain in average temperature over the previous month? A. February B. March C. April D. May

Math (misleading graphs) (Statistics)
When constructing a graph showing the population of two​ countries, an illustrator draws two different people with heights proportional to the populations. Identify a way in which the graph might be misleading. What is the general name for such graphs that use drawings of ...

statistics
A random variable has aprobability function p(x)=kx; x=1,2,3,4,5.find the value of k, p(x>=3),compute mean and variance of x.

Statistics
in a medical examination, 300 people undergo a height measurement and was found out that the average height of all are 150cm. if the standard deviation is 19, find the number of people that fall under the given conditions: a)with the height less than 132cm. b)with height from ...

American Government
Please check my answers 1. Which kind of policy was the troubled asset relief program (TARP)? A. It was a fiscal policy and I could buy the federal government to prevent inflation B. It was a monetary policy enacted by the federal government to expand the economy C. It was a ...

Statistics
A two-digit number is written down at random.Find the probability that the number will be A)Smaller than 20 B)Even C)Multiple of 5

Statistics
Add a carnival, you play ring toss game 30 times. It's only a dollar to play, and your chances of winning the five dollar prize are advertised at 15%! What are your expected winnings?

Statistics
A population of values has a normal distribution with μ=76.6 and σ=43.9 You intend to draw a random sample of size n=142. Find P75, which is the score separating the bottom 75% scores from the top 25% scores.

Statistics
A driver comes to pick up members of your family for a family reunion. The van holds 7 people, not including the driver. Assuming that none of the babies will be riding in the van, how many different ways can 7 people be chosen to ride in the van?

Probability & Statistics
The life expectancy (in hours) of a fluorescent tube is normally distributed with a mean 8000 and a standard deviation 1000. Find the probability that a tube lasts for more than 11000 hours.

Statistics
The monthly salaries (in thousands of dollars) of a sample of sales representatives are as follows: 13, 7, 10, 9, 8, 13 Find the standard deviation of this sample of monthly salaries. Round your answer to at least two decimal places.

College Statistics
How much should you invest each month in order to have $800,000 if your rate of return is 5.3% compounded monthly and you want to achieve your goal in 40 years? How much interest will you earn? How much should you invest each month in order to have $800,000 if you want to ...

statistics
construct a probability distribution for18 boys and 24 girls

statistics
0.95 of confidence find the confidence interval for the mean

statistics
0.95 degree of confidence find the confidence interval for the mean of the whole population

statistics
a normal distribution has a mean of 20 and a standard deviation of 10. Two scores are sampled randomly from the distribution and the second score is subtracted from the first. What is the probability that the difference score will be greater than 5?

english
What does the author achieve by mixing exact and approximate numbers in "A Contribution to Statistics?"

Math check - Statistics
Can someone (preferably one of the long-term tutors) check my answers: Researchers trap 23 devils, and find that 18 of them are infected. Provide an estimate of disease prevalence. p-hat = (18/23)=0.783 Part II: assuming the same disease prevalence from above. If they trap 2 ...

statistics
Janet has a jar with 8 gold marbles 12 silver marbles and 4 bronze marbles is she chooses two marbles without replacement, what is the probability that she chooses two silver marbles. I think the answer is 11/46 but not sure how to work the prboem

Statistics
Profitability remains a challenge for banks and thrifts with less than $2 billion of assets. The business problem facing a bank analyst relates to the factors that affect return on assets(ROA), an indicator of how profitable a company is relative to its total assets. Data ...

statistics
Scores on the GRE​ (Graduate Record​ Examination) are normally distributed with a mean of 541 and a standard deviation of 101. Use the 68-95-99.7 Rule to find the percentage of people taking the test who score between 238 and 844 The percentage of people taking the test ...

Statistics
Assume the probability of certain material to be detective produced by a company is 0.1 to inspect 10 items are selected so, probability at least one is defective

Statistics
If the probability of randomly choosing a county resident from a class of students is 65%, what is the probability of selecting exactly 7 county resident out of a random group of 10 students?

Statistics
Construct a 99% confidence interval for life expectancy of a new GE light bulb. 64 bulbs are randomly selected and a mean of 750 hours and a standard deviation of 20 hours is found. Assume the distribution of life expectancy is normally distributed.

Statistics
The heights of kindergarten children are normally distributed with a mean of 39.5 inches and a standard deviation of 3.8 inches. In a kindergarten class of 23 children, what is the probability that their mean height is between 38.1 and 41.2 inches?

Math (statistics)
Suppose an employee starts working after completing her MBA at age 30 at a starting salary of $50,000. She expects an annual salary increase to be at minimum 1%, at maximum 5%, with a uniform distribution. Her retirement plan requires that she contribute 8% of her salary, and ...

Statistics (Math 210)
Hi there, I am doing my statistics homework and am having trouble with a few problems. I sincerely appreciate any help I receive! :) According to a local chamber of commerce, in 1993, 5.9% of local area residents owned more than five cars. A local car dealer claims that the ...

Statistics (Math 210)
Hi there, I am doing my statistics homework and am having trouble with a few problems. I sincerely appreciate any help I receive! :) A manufacturer claims the standard deviation of salt in their meat is .5. An SRS of 18 samples shows the standard deviation (s)= .62 (alpha = ....

Statistics (Math 210)
Hi there, I am doing my statistics homework and am having trouble with a few problems. I sincerely appreciate any help I receive! :) A manufacturer claims that the mean lifetime of its lithium batteries if 1200 hours. A homeowner selects 25 of there batteries and finds the ...

Statistics (Math 210)
Hi there, I am working on a few homework assignments and having trouble with a few questions. I sincerely appreciate any and all help! :) A bank claims that the mean waiting time in line is less than 4.1 minutes. A random sample of 60 customers has a mean of 4 minutes with a ...

statistics
10th grade New York public school students taking a standardized English test produced test scores that were normally distributed with a mean of 85 and a standard deviation of 4. Let x be a random variable that represents the test score of a student. Students whose test scores...

Statistics
Thirty-three small communities in Connecticut (population near 10,000 each) gave an average of x = 138.5 reported cases of larceny per year. Assume that σ is known to be 42.9 cases per year. (a) Find a 90% confidence interval for the population mean annual number of reported ...

Statistics
Zhi and her friends needed to decide where to eat. They narrowed their options to eight restaurants, including Zhi's favorite restaurant, Merlin's. To decide where to go, Zhi flipped a coin three times to get eight possible outcomes, where each outcome corresponded to a ...

Math/ Statistics
A group of data elements has a mean M and a standard deviation S. a) Find the new mean and the new standard deviation if a constant number C is added to each data element in the group? Explain thoroughly. b) Find the new mean and the new standard deviation if each data element...

Statistics
The mean height of a certain kind of plant is 185 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 185. State the null hypothesis H0 and the alternative hypothesis H1 that ...

statistics
John runs a computer software store. Yesterday he counted 133 people who walked by the store, 66 of whom came into the store. Of the 66, only 24 bought something in the store.

Statistics
About 74% of young adult Internet users (aged 18 to 29) use social network sites. Suppose that a sample survey contacts an SRS of 2000 young adult Internet users and calculates the proportion p̂ in this sample who use social network sites.

Statistics
Salaries of 50 college graduates who took a statistics course in college have a​ mean, x of $68,200. Assuming a standard​ deviation, σ​, of $12,279​, construct a 95% confidence interval for estimating the population mean μ.

statistics
At a cafeteria the customers arrive at an average of 0.3 per minute. The probability that a)exactly 2 customers arrive in a 10 minute span b)2 or more customers arrive in a 10 minute span c) one customer arrives in a 5 minute span and one customer arrives in the next minute..

statistics
Consider an upper-tail test of hypothesis for the difference in two population means. The sample data from the first population is: n = 50, x-bar = 110, s = 10. The sample data from the second population is: n = 75, x-bar = unknown, s = 11. We conclude the alternative ...

Statistics
18 of the 50 dvrs in an inventory are known to be defective. What is the probability you randomly select an item that is not defective?

Statistics
A box contains 4 red marbles and 5 blue marbles. Michelle picks 3 marbles at a random. If Z is the random variable, representing the number of blue marbles picked from the box. Do the ff: A. Express the probability function in tabular and formula form. B. Complete the ...

Statistics
A cooperation must appoint a president, CEO, coo, CFO. There are 15 qualified candidates. How many ways can the officers be appointed?

STATISTICS
A die is biased and the probability, p , of throwing a six is known to be less than 1 6 . An experiment consists of recording the number of sixes in 25 throws of the die. In a large number of experiments the standard deviation of the number of sixes is 1.5. Calculate the ...

STATISTICS
In the mass production of bolts it is found that 5% are defective. Bolts selected at random and put into packets of ten. A packet is selected at random. Find the probability that it contains (a) three defective bolts. (b) less than three are defective. Two packets are selected...

Statistics
Please help I don't know how to solve this problem : Trevor is interested in purchasing the local hardware/sporting goods store in the small town of Dove Creek, Montana. After examining accounting records for the past several years, he found that the store has been grossing ...

Statistics
The life span of a calculator manufactured by the Intel Corporation has a normal distribution with a mean of 54 months and a standard deviation of 8 months. The company guarantees that any calculator that starts malfunctioning within 36 months of the purchase will be replaced ...

statistics
To observe the effect of increasing sensitivity, assume a blood sugar screening level of 130 mg percent, with a sensitivity of 44.3% and a specificity of 99.0%. Set up a two by two table with the appropriate numbers in each cell. Calculate the following values when the number ...

mathematical methods for economics
in a class of 300 students,they were given mathematics test in three subjects namely,economics,statistics and mathematics,90 students failed in economics,100 failed in statistics,96 failed in mathematics,60 failed in economics and statistics,64 failed in statistics and ...

Statistics
The heights of women in a certain population have a Normal distribution with mean 64 inches and standard deviation 3.5 inches. We select three women at random from this population. Assume that their heights are independent. Find the probability that the tallest of these three ...

Statistics
What is the average miles per gallon (mpg) for all new cars? Using Consumer Reports, a random sample of 35 new cars gave an average of 21.1 mpg. (a) Identify the variable. new cars total miles all cars miles per gallon (b) Is the variable quantitative or qualitative? ...

statistics and probabilities
Suppose you will be taking exams in English, statistics and chemistry tomorrow and from past experience you know that for each exam you have a 50% chance of receiving an A. List all the possibilities for receiving A's on various exams. Letting X represents the number of A's ...

Statistics
Sorry but I don't know how to do this problem. Can someone please help me? In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. Ocean fishing for ...

staistics
7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?

Stats
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: The top 10% receive A's. The next 20% receive B's. The middle 40% ...

Math
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: The top 10% receive A's. The next 20% receive B's. The middle 40% ...

Math
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: The top 10% receive A's. The next 20% receive B's. The middle 40% ...

AP Statistics - Chapter 6
A quiz consists of 20 multiple-choice questions, each with 6 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 50 %. P(pass)=

Statistics
Please help, I do not understand how to do this: Let x be a random variable that represents white blood cell count per cubic milliliter of whole blood. Assume that x has a distribution that is approximately normal, with mean μ = 7400 and estimated standard deviation σ = 2900...

Statistics
Suppose the heights of 18-year-old men are approximately normally distributed, with mean 66 inches and standard deviation 4 inches. (a) What is the probability that an 18-year-old man selected at random is between 65 and 67 inches tall? (Round your answer to four decimal ...

Statistics
In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. Ocean fishing for billfish is very popular in the Cozumel region of Mexico. In the Cozumel region ...

English 10
A Contribution to Statistics" 1.Which of the following words best describes the author's view of humanity in "A Contribution to Statistics"? A. Altruistic B. Optimistic*** C. Pessimistic D. Realistic Read the following lines from the poem "A Contribution to Statistics." Glad ...

Statistics
Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of 32 months before certain electronic components deteriorate, causing the watch to become unreliable. The standard deviation of watch lifetimes is 7 ...

Statistics
find z such that 6.6% of the standard normal curve lies to the right of z. (Round your answer to two decimal places.)

Statistics
A youth group has 7 boys and 5 girls. Experiment is select 5 people at random from the group. Let X be the number of boys in the selected 5 people. (a) Find the probability of exactly 1 boy, i.e., P([X = 1]). (b) Find the probability of exactly 2 boy, i.e., P([X = 2]). (c) ...

Statistics
Before a DVD player leaves the factory, it is given a quality-control check. The probability that a DVD player contains 0, 1, or 2 defectives are 0.90, 0.08, and 0.02, respectively. In a sample of 10 players, (a) Find the probability that 6 have 0 defects, 3 have 1 defect, ...

Statistics
Suppose that the probability that an item produced by a certain machine will be defective is 0.2. A sample of 12 items is chosen. Let X be the number of defectives among the selected 12 items. (a) Find the probability of at most 1 defective item. (b) Find the probability of at...

English
What does the author achieve by mixing exact and approximate numbers in "A Contribution to Statistics?"

Statistics
A random sample of size n is to be drawn from a population with a mean = 1100 and SD = 300. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.

Math Statistics
N= 80 p = 0.7 x = 62? A) Exact: 0.0335; Approximate: 0.0334 B) Exact: 0.0343; Approximate 0.0334 C) Exact: 0.0343; Approximate: 0.0350 D) Exact: 0.0343; Approximate: 0.0342 Which one is the correct answer and can you show work please?

Math Statistics
A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.

Statistics
A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.

English
Which of the following is not an object of satire in "a contribution to the statistics'? A. The self importance of social studies B. The corruption of the powerful C. Thee pride of mankind D. The delusions of common people << Which of the following sentences contains a ...

English
Read the following lines from the poem "a contribution to statistics" "glad to lend a hand if it doesn't take too long -as high as forty-nine, always good because they can't be otherwise -four, well maybe five, the speaker shares high and low statistical data most likely to? A...

Statistics
A basketball team has to play 3 games in an elimination roumd. What is the probability of them winning? A. 0 games B. 1 game C. 2 games D. 3 games

Statistics
John drives to work each morning and the trip takes an average of µ = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of s = 5 minutes. For a randomly selected morning, what is the probability that John’s drive to work will ...

statistics
A music industry researcher wants to estimate, with a 90% confidence level, the proportion of young urban people (ages 21 to 35 years) who go to at least 3 concerts a year. Previous studies show that 21% of those people (21 to 35 year olds) interviewed go to at least 3 ...

statistics
The mean rent of a 3-bedroom apartment in Orlando is $1200. You randomly select 12 apartments around town. The rents are normally distributed with a standard deviation of $75. What is the probability that the mean rent is more than $1000?

statistics
As a manager for an advertising company, you must plan a campaign designed to increase Twitter usage. A recent survey suggests that 85% of adults know what Twitter is. How many adults should you survey in order to be 90% confident that your estimate is within 5% of the true ...

statistics
Assume that men have IQ scores that are normally distributed with a mean of 99 and a standard deviation of 13. Find the IQ score that separated the lower 30% of the others. Round up to the nearest integer.

Statistics
A bag contains 8 red marbles 4 blue marbles and 1 green marbles. Find p(not blue)

Statistics
According to the record of the registrar's office at a state university, 35% of the students are freshman, 25% are sophomore,16% are junior and the rest are senior. Among the freshman, sophomores, juniors and seniors, the portion of the students who live in the dormitory are ...

statistics
there are 7 blue socks,5 red socks,3 green socks and 4 yellow socks in a drawer. 1.find the sample space 2.how many socks should I take out without looking to get a pair of socks 3.what is the probability that the first socks that I draw is red 4.what is the probability that ...

statistics
A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterer’s food. If p ^ is the sample proportion saying that the...

Statistics
A card is drawn from a deck of 52 and recorded. Then the card is replaced and the deck is shiffeled. this process is repeated five times. What is the probability that all five times the car drawn is an ace

statistics
the arithematic mean of two numbers is 15 and geometric meanis 12.Find the two numbers and find harmonic mean of these numbers.

statistics
A crane is designed in such a way that it can lift a maximum load of 2750kg.Is the crane overload if the container is filled with 50 bags of cement 40kg each and 5 machine of average 100kg?

statistics
a person drove on a highway first 5km at a speed of 60km/h ,the second 5km at a speed of 85km/h , third 5km at a speed of 92km/h and last 5km of his journey,the speed was 8okm/h.Use suitable average to find average speed of the journey of 20km.

STATISTICS
If is equal to 0.79, then is equal to ______.

business statistics
1. The average life expectancy of people around the world is 71.30 years with a population standard deviation of 8.00 years. I take a sample of 50 countries now and find that the average life expectancy is 74.37 years. Suppose I’m interested in seeing if there has been a ...

Statistics
Need help with this statistics assignment. Of course not asking for you to do it, just an example or help on how to answer. Find some information in a book, research article, newspaper, magazine, or online about any kind of medical research that includes a measure of center or...

statistics
A factory's worker productivity is normally distributed. One worker produces an average of 72 units per day with a standard deviation of 23. Another worker produces at an average rate of 68 units per day with a standard deviation of 23. A. What is the probability that in a ...

statistics
an archer shoots arrows at the bull's eye of a target and measures the distance from the center of the target to the arrow. identify the random variable of interest, determine whether it is discrete or continuous, and list its possible values

Statistics
Suppose that 30% of all college students smoke cigarettes. A sample of 18 is selected randomly. What is the probability that exactly 10 students smoke? Round your answer to four decimal places.

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