Test Hypotheses About a Population Proportion
-In 1990, the Mean $\sigma = 1.1$

Short Answer

Test Hypotheses about a Population Proportion
-In 1990, the mean for the number of pets owned per household was 1.9. A poll of 1023 households conducted this year reported the mean for the number of pets owned per household to be 1.8. Assuming $\sigma = 1.1$ , is there sufficient evidence to support the claim that the mean number of pets owned has changed since 1990 at the $\alpha =$ $0.1$ level of significance?