A study estimates the mean annual family income for families living in public housing in Chicago. For a random sample of 30 families, the annual incomes (in hundreds of dollars) are in the Chicago data file at the text website and here:

133 140 127 150 133 114 128 142 123 172 146 110 135 136 158 120 189 106 144 134 161 143 170 120 142 150 174 109 162 129

(a) Based on a descriptive graphic, what do you predict about the shape of the population distribution?

(b) Find and interpret point estimates of μ and σ, the population mean and standard deviation.

(c) Construct and interpret a 95% confidence interval for μ.