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?

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The Answer of 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?

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

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