A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
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.
A two-tailed test is conducted at the 5% significance level. What is the P-value required to reject the null hypothesis?
A two-tailed test is conducted at the 5% significance level. What is the right tail percentile required to reject the null hypothesis?
What is the difference between an Type I and a Type II error? Provide an example of both.