Question

Two Cal Poly freshmen gathered data on the prices for a random sample of 30 textbooks from the campus bookstore. They found the average price was $65.02, and the standard deviation of prices was $51.42. The data are not strongly skewed.​

1. identify the observational unit for this study

a. textbooks

b. campus bookstore

c. price

d. average price

2. Identify the variable of interest and whether it is categorical or quantitative.

a. price, quantitative

b. textbooks, categorial

c. price, categorial

d. textbooks, quantitative

3. Using a Theory-Based Inference applet, find the 95% confidence interval for the average cost of a textbook at Cal Poly. Round to two decimal places.

Answer 1