25. Individual weights of direct mail advertisements sent by El Dominguez Compan

Question

25. Individual weights of direct mail advertisements sent by El Dominguez Company are normally distributed with unknown population standard deviation. Currently, management believers that the population mean weight is exactly equal to 2 ounces (no more, no less). In order to test this hypothesis, a random sample of 9 direct mail advertisements were weighted to obtain a sample mean weight of 2.4 ounces and a sample standard deviation of 0.6 ounce. Use a level of significance of 0.20 to test the null hypothesis that the population mean weight is exactly 2 ounces against the alternative hypothesis that it is not. Based on these information, the critical t is/are A. +1.397 B.-1.397 and +1.397 c.-1.397 D. Not enough infornmation given to answer this question E. None of the above

Explanation / Answer

n=9 alpha=0.2

H0: Mu=2

H1: Mu is not equals to 2 (two tailed test)

t critical value at 19 df with 0.2 level is -1.397 and 1.397

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