A survey examined public opinion about the effectiveness of the criminal justice system in Baltimore (based on a scale of 1 - 10, with a response of 1 being the least favorable and a response of 10 being the most favorable). The overall view of the criminal justice system was measured in a national study and was positive - an average of 6.5 out of 10. The Baltimore survey had 150 respondents and a mean of 5.7 with a sample standard deviation of 1.5. What kind of test of averageswould be used to examine the difference between the average attitudetoward police in Baltimore and the average attitude toward police in the USA as a whole?

1. What is the null Hypothesis and the non alternative/ Research Hypothesis for the survey outlined.

State the Null Hypothesis and non alternative in sentences rather than symbols

1. Explain why you chose the specific procedure for this survey research that you selected in Question 1.

Dr. A and Dr. B want to test whether violent video games have an effect on aggressive thinking in high school youth. In order to measure aggressive thinking, the researchersare going to use a test developed at GTA University. The test has shown thatscores greater than 70 on the test indicate that the subject is more likely to agree with statements that endorse aggressive behavior. The researchersselect a randomsample of n = 250 youth from a after school program for the study. Each of the students spends an hour playing a first-person shooter-type video game and then takes the test. The mean and standard deviation for the sample are mean = 71.75 and standard deviation = 20. The researcherswould like to know if the sample mean of 71.75 is statistically significantly different from 70 using a two-tailed test with < .05 and critical values of t of 1.96.

1. The null Hypothesis for this test would that be the test average?H_o: =
2. What is the estimated standard error for this test
3. Calculate the value of the t- statistic
4. Is this test one tailed or two tailed?
5. Does the T statitstic fall tin the critical region
6. Do you accept or reject the null Hypothesis
7. Why are the researchers describes using a t test rather than a Z test.