1. A survey of 64 BAN 280 students at UNCW was conducted to assess the average of extra hours students study for midterms. The sample size of 64 shows us that on average, students study 10 hours per week. Find a 95% confidence interval for the true population mean given that = 1.75 hours per week.

Confidence Interval with Unknown

1. Time to register for classes! You look into a system that shows final exam grades for the Stats II class you really want to take. The final exam scores are:

87	71	54	90	67	83	99
66	80	79	85	92	90	88

If these final exam grades were to predict the Stats II grades for next semester, what is your best guess for the mean grade once you enroll? Compute a 90% confidence interval for the population mean grade.

Confidence Interval for Population Proportion

1. The Cameron School of Business conducted a survey of its 2500 students about Business Week involvement. The survey results show that 1600 respondents desire additional internship opportunities. Develop a 90% Confidence Interval for the population proportion.

Sample Size for a Mean

1. What sample size is required to estimate the mean amount of Dr. Pepper in 16.9 oz bottle with 99% confidence if = 0.10 oz and keeping error within +/- 0.02 oz?

Sample Size for a Proportion

1. You just received an internship to be a Blue Bell Ice Cream quality control analyst and are tasked with using your knowledge from BAN 280 to determine what sample size is required to estimate the proportion of Peppermint Bark ice cream half gallon containers weighing less than 2.5 lbs with 95% confidence and the error within 1.75% when initial estimate shows = 0.75?