Problem #3 on your calculation sheet. The Marine Life Institute has developed a media campaign designed to decrease the amount of trash pollution in the local harbors. Before the campaign began, researchers measured the amount of pollution (in pounds) pulled from each of the local harbors. After the campaign was over, they returned to the same harbors and measured the amount of pollution (in pounds) left in the harbors. The third data set on your calculation sheet (problem #3) shows how much pollution were present both before and after the media campaign. Column “Pre” shows the amount of pollution before the campaign and Column “Post” shows the amount of pollution after the campaign. We would like to know if the campaign made a difference in the amount of pollution the people caused in the harbors. What is the independent (or quasi-independent) variable in this study?

Problem #3 in your calculation sheet. Report the outcome of the hypothesis test and how you decided whether or not to reject the null hypothesis.

Problem #2 on your calculation sheet. How would you explain the results of this hypothesis test to a non-statistician? Explain any conclusions about the differences observed, or the lack thereof. If there was a statistically significant difference, be specific about the direction of the difference (i.e. which group had more or less of the outcome of interest). You do not need to include your APA statistical values, just explain the results in sentence format. 

Problem #1 on your calculation sheet The Academic Scholars committee is currently having a fundraising campaign. Their goal is to obtain an average of $20.00 from each contributor. The first data set you worked with (Problem #1) consists of contributions given to the alumni foundation so far. The foundation wants to determine whether the contributions they have received so far are significantly different from their goal of $20.00. What value(s) does the null hypothesis predict for the mean?

The average age for licensed drivers in a certain county is 42.6 years with a standard deviation of 12.2. years. A researcher obtained a sample of 25 drivers who received parking tickets and computed the average age of these drivers. Which test should he use to determine if the average age of the drivers who received parking tickets is significantly different from the average age of drivers in the entire county?

Please scan the calculation sheet and upload to Blackboard (link can be found in the Exam 2 folder). This is just a placeholder to assign points.

You are interested in determining whether the grades of current high school students in Grand Forks are different than the grades of past students. The state board of education is able to tell you that the mean GPA for students graduating in Grand Forks in the past 40 years is 2.82, but that is all the information they have. You randomly select 90 students who are about to graduate and compute their mean GPA. Which statistical test will tell you if there is a difference in GPA between the current students and students from the past 40 years?

Did you begin a Yuja Proctoring Session? If not, start one now before proceeding to the rest of the test. 

Based on the z-score you reported in your previous answer, what is the probability of getting a score of 17 or lower?

Which of the following are advantages to a repeated-measures design?