A company that produces cell phones claims its standard phone battery lasts long

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 90% confidence interval and state your conclusion. Explain how you dealt with any outliers Time 31 31 34 32 31 34 31 58 34 34 34 35 Plot the data. Choose the correct histogram below B. O C. 60 Battery Life (hours) 60 Battery Life (hours) 60 Battery Life (hours) 60 Battery Life (hours)

Explanation / Answer

The statistical software output for this problem is:

One sample T confidence interval:
: Mean of variable

90% confidence interval results:

90% confidence interval results (without outliers):

Hence,

Histogram: Option C is correct.

Are any of the observations outlier? Option B is correct.

90% confidence interval: (31.07, 38.77)

90% confidence interval without outlier: (31.94, 33.69)

Conclusion: Option A is correct.

Variable Sample Mean Std. Err. DF L. Limit U. Limit Time 34.916667 2.1442606 11 31.065822 38.767512

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