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For a confidence interval for the population mean, if you decrease the confidence level, what happens to the width of the interval (everything else remains the same)?

Suppose that you took a random sample of 15 students at UF and asked them how many minutes they exercised yesterday. Suppose that you wanted to make a 90% confidence interval for the population mean. What value would you use for t?

The amount of calories in a small serving of French Fries at McDonalds is Normally distributed with a mean of 230 calories and a standard deviation of 25. Suppose that a random sample of 15 small servings was collected. What is the probability that the sample mean is greater than 240 calories?

Fifteen females were recorded on their reaction time to a stimulus. The 95% confidence interval for the population mean was (14.56, 18.75) seconds. What do we know from this confidence interval?

For Ho:p = 0.60 versus Ha: p does not equal 0.60, when the test statistic equals 1.54, what is the p-value?

According to the Georgia department of Labor, as of May 2011, the average salary of all people living in Atlanta was 55,733 dollars. Someone who didn’t know this took a sample of 50 working people in Atlanta and averaged their salaries. For the 50 people, the average salary was 56,771 dollars. Match the following terms with their amounts

Suppose that one of the UF softball players had a 0.34 probability of getting a hit each time at bat. Suppose that there were a total of 60 at-bats. What would be the mean and standard error of the sampling distribution of the sample proportion of hits?

If n is decreased, what happens to the standard error of the sampling distribution of the sample mean?

Suppose that one of the UF softball players had a 0.39 probability of getting a hit each time at bat. Suppose that there were a total of 60 at-bats. What would be the mean and standard error of the sampling distribution of the sample proportion of hits?

The general social survey asked participants (randomly selected Americans) in 2010 how many hours they worked. The 95% confidence interval for the population mean hours spent working was (40.36, 42.36). Finish the following sentence.  “We are 95% confident that  . . .”