1.36 randomly selected BRU students were surveyed to determine how much they spend buying textbooks each semester. This sample produced an average of$1350. We are told that the standard deviation of all BRU students' spending is of $234. Determine a 94% confidence interval for the corresponding population mean.

2.A researcher claims that at least 80% IBT students drink coffee. A representative from Starbucks Coffee is interested in testing whether a different proportion of IBT students drink coffee.

The Starbucks Coffee representative conducted a simple random sample of 50 STU students and found that 42 of these 50 students drink coffee.Using the p-value approachgiven a 5% significance level,what is your conclusion about theresearcher's claim?

3. A researcher wants to make a 93% confidence interval for a population mean. She wants the margin of error to be within 2.0 of the population mean. The population standard deviation is 9.0. Calculate the appropriate sample size.