A survey was conducted that asked 1007 people how many books they had read in the past year. Results

A survey was conducted that asked 1007 people how many books they had read in the past year. Results indicated that x overbarequals11.3 books and sequals16.6 books. Construct a 90% confidence interval for the mean number of books people read. Interpret the interval.

x bar = 11.3
s = 16.6
n = 1007

We use our confidence interval calculator and get 10.4395 < u < 12.1605.

We interpret this as:
If we repeated experiments, the proportion of such intervals containing u would be 90%