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A random sample of 1 2 1 automobiles traveling on an interstate showed an average speed of 6 5 mph . From past information, it

A random sample of

121

automobiles traveling on an interstate showed an average speed of

65

mph

.

From past information, it is known that the standard deviation of the population is

22

mph

.

if we are interested in determining an interval estimate for at

96.6 %

confidence, the Z value to use is

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