Hip surgery:In a sample of

120

hip surgeries of a certain type, the average surgery time was

136.3

minutes with a standard deviation of

22.3

minutes.

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Part 1 of 2

(a) Construct a

95%

confidence interval for the mean surgery time for this procedure. Round your answers to one decimal place.

A

95%

confidence interval for the mean surgery time for this procedure is

33

<<

3434

.

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Part 2 of 2

(b) If a

98%

confidence interval were constructed with these data, would it be wider or narrower than the interval constructed in part (a)? Explain.

The new confidence interval would be (Choose one) than the interval constructed in part (a).