Question: Charge the battery for one mobile phone model from a random sample of 25 phones mean endurance time was 10 hours and standard deviation was

Charge the battery for one mobile phone model from a random sample of 25 phones

mean endurance time was 10 hours and standard deviation was 1.2 hours.

a. What is the average of the audience?

b. What is the point estimate of the mean of the audience?

c. Establish and interpret a 95 percent confidence interval for this average battery life time.

D. Does it make sense to state that the mean is 11?

to. To evaluate the mass mean with a 95 percent confidence level and an error of 0.2 units

How large a sample is required?

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