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 34 hours. To investigate this claim, a consumer advocacy group asked the company for the raw data, which are shown to the right. Find a 90% confidence interval and state your conclusion. Explain how you dealt with any outliers.
Time 30, 31, 32, 34, 32, 32 / 31, 32, 34, 56, 31, 33
1. Find the confidence interval usisng all the data (Round to two decimal places)
2. if outliers are present, find the confidence interval without the outlier ( Round to two decimal places)