According to the Census Bureau, 3.20 people reside in the typical American household. A sample of 26 households in Arizona retirement communities showed the mean number of residents per household was 2.86 residents. The standard deviation of this sample was 1.20 residents. At the .05 significance level, is it reasonable to conclude the mean number of residents in the retirement community household is less than 3.20 persons? Compute the value of the test statistic. ( Round your answer to 3 decimal places.)
Explanation / Answer
H0: mean = 3.2 H1: mean 3.2 So mean is less than 3.2