A publisher wants to estimate the mean length of time​ (in minutes) all adults spend reading newspapers. To determine this​ estimate, the publisher takes a random sample of 15 people and obtains the results below. From past​ studies, the publisher assumes sigma is 1.8 minutes and that the population of times is normally distributed.
10
11
8
10
10
6
11
6
9
9
8
12
8
8
12

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Part 1
Construct the​ 90% and​ 99% confidence intervals for the population mean. Which interval is​ wider? If​ convenient, use technology to construct the confidence intervals.
The​ 90% confidence interval is ​(
  
enter your response here​,
  
enter your response here​).​ (Round to one decimal place as​ needed.)