The Denver Police Department wants to improve its image with teenagers. A uniformed officer is sent to a school 1 day a week for 10 weeks. Each day the officer visits with students, eats lunch with students, attends pep rallies, and so on. There are 18 schools, but the police department can visit only half of these schools this semester. A survey regarding how teenagers view police is sent to all 18 schools at the end of the semester. (Select all that apply.) a) After the police visits, survey 9 of the schools to see if there is a difference in views between the two groups. b) No placebo is being used. c) Use random selection to pick 18 schools to visit. d) After the police visits, survey all the schools to see if there is a difference in views between the two groups. e) A placebo is used for the remaining 9 schools. f) Use random selection to pick nine schools to visit.

A statistics instructor would like to know whether it is worthwhile to require students to do weekly homework assignments.  For Section1 of the course, homework is assigned, collected and graded each week.  In Section2, students are not required to turn in homework.  At the end of the semester, the students are given the same final exam.  In Section1, the numbers of students getting each grade are: 16 students got A, 22 students got B, 8 students got C, and 4 students got D.  In Section2, the numbers of students getting each grade are: 8 students got A, 18 students got B, 18 students got C, and 6 students got D.  Is there an association between assigning homework and exam grade?  Test at the alpha = 0.05 level.     a. We reject the null hypothesis with two-tailed critical values; there is an association between assigning homework and exam grade.   b. We reject the null hypothesis with one-tailed critical value; there is an association between assigning homework and exam…

A professor has a class with five recitation sections. Each section has 18 students. The question is whether or not the average test score is significantly different for any of the sections. Group-1 Group-2 Group-3 Group-4 Group-5 83.7 84.3 56.6 67.5 60.7 80.8 77.1 83 71.9 80.2 91.3 72.4 77.4 70.5 57.3 80.1 74.4 79.2 79 68.7 93.3 71.9 73 81.8 70 78.1 73.7 74.5 62.8 64.5 76.5 69.7 81.4 75.1 63.1 68.2 72 75.2 83.7 65.5 62.8 71 79.3 85.4 67.6 76.5 73.1 74.5 81.5 67.1 79.2 67.9 74.9 86.7 72.2 62.1 78.7 84.8 63.4 80.8 86.7 97.2 66.8 79.3 68.2 79 74.6 66.4 75.9 67.7 79.1 82.3 69.3 70.3 68.2 71.1 62.2 53.3 71.1 58 61.8 68.9 82.7 60.2 73 70.7 83.2 61.9 64.6 49.5 Conduct a test to determine if the group means are equal using α=0.02α=0.02.  Summary statistics:F-ratio (F-test statistics) =      p-value =     (report accurate to at least 4 decimal places)What is the measure of effect size ω2ω2 ? This is on the Excel sheet and is also a measure of the…

2) Sheila scored 75, 80, 100, 60, and 85 on her last five history tests. She has a final exam that will count as two exams. What score must Shiela obtain on this final exam in order to earn the grade of B? the grading scale for B is 80-89.

A survey of 150 freshmen business students at a local university produced the results listed below. How many students took only religion? 35 took history;42 took science;43 took religion;19 took history but not science;14 took science and religion;15 took history and religion;6 took all three

To help plan the number of meals to be prepared in a college cafeteria, a survey was conducted, and the following data were obtained. 127 students ate breakfast.183 students ate lunch.272 students ate dinner.60 students ate breakfast and lunch.111 students ate breakfast and dinner.90 students ate lunch and dinner.53 students ate all three meals. How many students ate (a) At least one meal in the cafeteria?  students(b) Exactly one meal in the cafeteria?  students(c) Only dinner in the cafeteria? students(d) Exactly two meals in the cafeteria? students

A survey of 400 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school.      Undergraduate Major             Graduate School Business Engineering Other Total   Yes   33   43   61 137   No   90 105   68 263   Total 123 148 129 400 What percentage of the students' undergraduate major is Engineering?   a. 65.75%     b. 520%     c. 152%     d. 37%

Help.

8) In the US, 4.5% of the population identifies as lesbian, gay, bisexual, or transgender (see, for instance, this report). In the UK, the LGBT community accounts for 1.5% of the population. Which of the following can be inferred from the given information? a) The number of LGBT individuals in the US is greater than that in the UK. b) The proportion of LGBT individuals in the US is 3% greater than the proportion of LGBT individuals in the UK. c) The proportion of LGBT individuals in the UK is 3% less than that in the US. d) The proportion of LGBT individuals in the UK is 200% greater than that in the US. e) The proportion of LGBT individuals in the US is 200% greater than that in the UK.