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According to the College Board's report, the average tuition and fees at four year private colleges and universities in the United States was $18,273 for the academic year 2002 - 2003 and the standard deviation was $2100. For a random sample of 100 four year private U.S. colleges, answer the following:
a. What is the mean of the sampling distribution?
b. What is the standard deviation of the sampling distribution?
c. What is the probability that the mean tuition and fees of the sample is greater than $20,000?
d. What is the probability that the mean tuition and fees of the sample is less than $16,000?
e. What is the probability that the mean tuition and fees of the sample is within $550 of the population mean?
Find out a plausible value r for correlation between vehicle weight and miles per gallon (mpg) shown in the scattergram below?
Consider binomial distribution with 14 identical trials, and probability of success of 0.4.
The average score of all pro golfers for a particular course has a mean of 70 and a standard deviation of 3.0. Assume 36 golfers played the course today. Find the probability that the average score of the 36 golfers exceeded 71.
Determine the probability that we would reject null hypothesis given that it is true?
Two groups of students are asked to rank their preference for six types of soft drinks. The following table shows their rankings.
At the .05 significance level, can we conclude that the guideline is still reasonable?
a) Explain why it would be hard to take a Simple Random Sample? b) Describe how to take a cluster sample of chocolate chip cookies.
A computer is used and it is found that the P-value = 0.0016. What can you state about the sample (independent or dependent) and what can you conclude about the evidence?
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
There are 500 employees in a firm, 45% are female. A sample of 60 employees is selected randomly. (a) Determine the standard error of the proportion.
A store asked 250 of its customers whether they were satisfied with the service or not. The responses were also classified according to the gender of the customers. We want to study whether there is a relationship between satisfaction and gender.
One environmental group did a study of recycling habits in a California community. It found that 73% of the aluminum cans sold in the area were recycled. (Round your answers to four decimal places.)
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