Question

A company that produces cell phones claims its standard phone battery lasts longer on average than other batteries in the market. To support this​ claim, the company publishes an ad reporting the results of a recent experiment showing that under normal​ usage, their batteries last at least 35 hours. To investigate this​ claim, a consumer advocacy group asked the company for the raw​ data, which are shown to the right. Find a 95 ​% confidence interval and state your conclusion. Explain how you dealt with any outliers. 31 35 30 33 34 31 32 31 34 56 32 31

Plot the data. Choose the correct histogram below.

Are any of the observations​ outliers? Explain.

Find a 95​% confidence interval for the true mean. What do you conclude about the​ claim? If there are​ outliers, find intervals with and without the outliers present.

Find the confidence interval using all of the data.

The confidence interval is

If outliers are​ present, find the confidence interval without the outliers. Select the correct choice below​ and, if​ necessary, fill in the answer boxes within your choice.

Answer 1