Hypothesis Test Assignment (1) f man Bod 5. A professor at a community college claims that a college algebra student can increase his or her score on an exam if the person is provided with a pre-test the week before the exam. To test her theory, she selected 16 college algebra students at random and gave these students a pre-test the week before an exam. She also selected a random sample of 12 students who were given the same exam but did not have access to a pre-test. The first group had a mean score of 79.4 with standard deviation 8.8. The second group had a mean score of 71.2 with standard deviation 7.9. Test to see if the population mean score of students who get a pre-test is different from the population mean score of those who do not. Use a 5% significance level. a) State the null and alternate hypotheses. b) Would you use the normal distribution (z) or Student's (t) distribution? Why? c) State the test statistic and p-value of your test. Round your answers to four decimal places. F C would ther up on is- pposite admill kes to

An anger-management course claims that, after completing its seminar, participants will lose their tempers less often. Always a skeptic, you decide to test this claim. A random sample of 12 seminar participants is chosen, and these participants are asked to record the number of times that they lost their tempers in the two weeks prior to the course. After the course is over, the same participants are asked to record the number of times that they lost their tempers in the next two weeks. The following table lists the results of the survey. Using these data, test the claim at the 0.01 level of significance assuming that the population distribution of the paired differences is approximately normal. Let participants before completing the anger-management course be Population 1 and let participants after completing the anger-management course be Population 2. Number of Times Temper Was Lost during a Two-Week Period Before 10 6 8 10 6 3 10 3 8 After 6 7 4 4 8 6 4 9 3 7 Copy Data Step 2 of 3:…

A recent survey of 1030 U.S. adults selected at random showed that 627 consider the occupation of firefighter to have very great prestige. Estimate the probability (to the nearest hundredth) that a U.S. adult selected at random thinks the occupation of firefighter has very great prestige.

In statistics, the hypothesis that is formally tested by the data is the: Alternative hypothesis Null hypothesis

1. (Hypothesis Testing) Dr. Ayati claims that 90% of her students are satisfied with the data science course. Jose was not very satisfied, and he suspected the student evaluation is false. He surveyed a random sample of 80 of Dr. Ayati's students and found that only 80% were satisfied. He also run 1000 simulation, each simulating a sample of 80 students assuming there are 90% satisfied students. % of satisfied students Frequency 80 5 82.5 24 85 72 87.5 181 90 281 92.5 272 95 136 97.5 27 100 2 (a) What is the null hypothesis and alternative hypothesis Jose is testing? (b) According to the simulation, what is the probability of getting a sample with 80% satisfied students or less? (c) What should Jose conclude regarding the hypothesis?

Students in a Psychology Stats class gathered 1st and 2nd year university students to gather self-report data on UFO, sightings during the past year. A year later the same students took the survey after taking LSD. The results of the self-report survey are as follows: Participant ID UFO sightings UFO sightings before LSD after LSD 1 1 2 1 3 2 2 4 1 3 3 1 7 3 A) State the Null and Alternative Hypothesis. B) Find the calculated "t" value and the critical "t" value C) State weather to accept or reject the Null Hypothesis

Your statistics instructor claims that 60 percent of the students who take her Elementary Statistics class go through life feeling more enriched. For some reason that she can’t quite figure out, most people don’t believe her. You decide to check this out on your own. You randomly survey 64 of her past Elementary Statistics students and find that 34 feel more enriched as a result of her class. Now, what do you think? Solve the following problems using the steps in conducting hypothesis tests.