Question: A 90 % confidence interval (a t interval) for the lives (in minutes) of Kodak AA batteries is ( 360, 440 ). Assume that this

A 90 % confidence interval (a t interval) for the lives (in minutes) of Kodak AA batteries is ( 360, 440 ). Assume that this result is based on a sample of size 30 .

1)What is the value of the sample mean?

400

390

405

440

360

2)What is the value of the sample standard deviation?

167.0607

129.0839

167.1906

128.9421

3)Construct the 99% confidence interval.

(335.1105,464.8895)

(342.0403,457.9597)

(366.0816,433.9184)

(369.1509,430.8491)

4)If the confidence interval (365.1891 ,434.8109) is obtained from the same sample data, what is the degree of confidence?

88%

85%

90%

95%

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