Question

At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased. Formulate the null and alternative hypotheses for the study described

Answer 1

Ho: µ = 18.4 -->population mean is equal to 18.4

Ha: µ < 18.4 -->population mean is less than 18.4

This would be a one-tailed test because the alternative hypothesis is showing a specific direction.

Note: The null hypothesis always uses an equals sign!