Household size: For the past several years. The mean number of people in a household has been declining. A social scientist believes that in a certain large city, the mean number of people per household is less than 2.5. To investigate this, she takes a simple

a. What are the null and alternate hypotheses?
b. What is the value of the test statistic?
c. What is the P-value?
d. Do you reject Ho at the a = 0.05 level?
e. Do you reject Ho at the a = 0.01 level? II. Interpret calculator display: The following 11-84 Plus display presents the results of a hypothesis test.

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Test of mu 4.7 vs not 4.7 The assumed standard deviation 2.0 N Mean SE Mearn 35 5.401 0.3381 (4.738, 6.064) 2.074 0.038 95% CI