Hypothesis Testing. U.S. Census data for year 2000 indicate a mean age in your hometown of 27 years. You believe that the mean age has decreased since 2000 and wish to test this hypothesis. Using a random sampling technique, you conduct a survey of households in your hometown and collect data on 196 individuals and find a mean age of 26.4 years with a standard deviation of 6 years. Formally state your hypotheses, select the correct test, and interpret the results.

Use alpha = 0.05 and round the numbers to 2 digits after the decimal point

Test effect is equal to ...... ?