Section 13

In a random sample of n = 40 mammals, the mean gestation period was 194 days with a standard deviation of 143 days. A hypothesis test is carried out to determine if the mean gestation period for all mammals is more than 180 days.

The null and alternative hypotheses for the test are:

H0:=180

Ha:>180

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Which of the following formulas would you use to calculate the test statistic?

t=x0sn t=x0sn xdtsdnd z=pp0p0(1p0)n 2=(ObservedExpected)2Expected xdtsdnd

Calculate the test statistic tothree decimal places (3dp).

Test statistic=

The p-value associated with the test statistic is 0.27. Which image below is the most representative of the distribution and p-value (area shaded in red)?

The pValue associated with the test statistic is 0.27. Which image below is the most representative of the distribution and pvalue (area shaded in red)? B AA A B AA