Author: Anonymous

According to a recent opinion piece, over 50% of eligible voters favor legalization of marijuana.  Determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed.

A survey of 2,500 U.S. citizens yielded 1,600 who are in favor of gun control legislation. Estimate the proportion of all Americans who are in favor of gun control legislation using a 90% confidence interval.

An insurance company sets up a statistical test with a null hypothesis that the average time for processing a claim is 7 days, and an alternative hypothesis that the average time for processing a claim is greater than 7 days. After completing the statistical test, it is concluded that the average time is 7 days. However, it is eventually learned that the mean process time is greater than 7 days. What type of error occurred in the statistical test?

A politician claims that 70% of his constituents favor a new ballpark. You wish to test this claim. Determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed.

Find the critical value, tα/2, for confidence level = 0.90 and n = 14. Round to 3 decimal places.

The engineering school at a major university claims that 30% of its graduates are women. In a graduating lass of 300 students 84 were women. Use

An insurance company sets up a statistical test with a null hypothesis that the average time for processing a claim is 7 days, and an alternative hypothesis that the average time for processing a claim is greater than 7 days. After completing the statistical test, it is concluded that the average time exceeds 7 days. However, it is eventually learned that the mean process time is really 7 days. What type of error occurred in the statistical test?

In a test of H0: μ = 200 against Ha: μ > 200, a sample of n = [n] observations possessed mean 

Hair cells

A solid sphere of undifferentiated cells.