Do students perform worse when they take an exam alone than when they take an exam in a classroom setting? Eight students were given two tests of equal difficulty. They took one test in a solitary room and they took the other in a room filled with other students. The results are shown below. Exam Scores Alone 85 84 90 77 79 90 86 82 Classroom 92 78 91 85 82 91 86 83 Assume a Normal distribution. What can be concluded at the the a = 0.05 level of significance level of significance?

assist with A,B,C,D

What about b and C?

Problem 1: Acme Trucking claims the average hourly salary of its mechanics is $9.25, with a standard deviation of $1.55. An employment agency researching local businesses randomly samples 81 mechanics and finds that they have an average hourly salary of $8.95. The employment agency suspects that the average salary given by Acme might be inaccurate, and the true average is lower. Use a 1% level of significance to test this theory. Let x be a random variable representing the hourly salary of mechanics. State the null and alternative hypotheses using x to be the mean of x. X X Assuming x is true, compute the test statistic for the results of the given sample. Should you reject, or fail to reject, the null hypothesis? Problem 2: Determine the correct hypothesis test to use and complete the test.   Boys of a certain age are known to have a mean weight of x pounds. A complaint is made that the boys living in a municipal children's home are underfed. As one bit of evidence, x boys (of…

I'm getting that the B is incorrect. Thank you for writing this out so I can go over and practice.

b. a = Vx-36, b = 6

5. Find AB ?