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 random sample of 130 households in the city, and finds that the sample mean number of people is 2.1 with a sample standard deviation of 1.3. Can you conclude that the mean number of people per household is less than 2.5? $H_0: \mu = 2.5$ $H_1: \mu < 2.5$ Part: 0 / 4 Part 1 of 4 (a) Which test is appropriate here? $\circ$ $t$ test $\circ$ $z$ test Part: 1 / 4 Part 2 of 4 (b) Compute the value of the test statistic. Round your answer to three decimal places. The test statistic is
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