A 90 % confidence interval (a t interval) for the mean lives (in minutes) of Kodak...

A 90 % confidence interval (a t interval) for the mean lives (in minutes) of Kodak AA batteries is ( 410, 470 ). Assume that this result is based on a sample of size 15 .

2) What is the value of the sample standard deviation?
66.2785
65.9677
86.6694
86.3843

3) Construct the 99% confidence interval.
(389.2961,490.7039)
(395.2976,484.7024)
(414.8193,465.1807)
(417.1658,462.8342)

Tries 0/2

4) If the confidence interval (414.0575 ,465.9425) is obtained from the same sample data, what is the degree of confidence?
88%
90%
85%
95%

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orchestra answered 1 year ago

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