Question

A consumer group claims that the mean acceleration time from 0 to 60 miles per hour...

A consumer group claims that the mean acceleration time from 0 to 60 miles per hour for a sedan is 6.8 seconds. A random sample of 33 sedans has a mean acceleration time from 0 to 60 miles per hour of 7.6 seconds. Assume the population standard deviation is 2.3 seconds. Find the standardized test statistic and the corresponding p-value.

z-test statistic = -1.998, p-value = 0.023
z-test statistic = 1.998, p-value = 0.046
z-test statistic = -1.998, p-value = 0.046
z-test statistic = 1.998, p-value = 0.023

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