1. Anationalrepresentativesurveyofstudentsingrades7-12askedaboutthe experience of these students with respect to sexual harassment. The students were asked whether or not they were harassed in person and whether or not they were harassed online. Here are the data for the boys:
1. (a) What is the sample proportion of being harassed in person given being harassed online? (call it ????”) What is the sample proportion of being harassed in person given not being harassed online? (call it ????#)
2. (b) Is there a difference between the two sample proportions? (Conduct a two sample proportion test with significance level 0.05)
3. (c) Is there an association between being harassed online and in person? (significant level 0.05)
(d) What do you find when you compare your statistics in part (b) and (c)? [Check the squared z statistic in part (b)]
2. APewInternetsurveyaskedcollegepresidentswhetherornottheybelieved that online courses offer an equal educational value when compared with courses taken in the classroom. The presidents were classified by the type of educational institution. Here are the data:
(a) Show the distribution of response using barplots for each of the institution type. (?barplot in R, check the argument ‘beside’)
(b) Is there an association between the presidents’ opinion to the question above with their institution types? (significant level 0.05)
Harassed in person Harassed online
Yes No
Yes 183 154
No 48 578
Response Institution Type
4-year private 4-year public 2-year private For profit
Yes 36 50 66 54
No 62 48 34 45

3. Asurveyof13,691Canadianstudentswhoenrolledinprivatecareercolleges was conducted to understand student participation in the private postsecondary education system. Students were asked about their field of study and how they paid for their education. A major source of funding was government loans. Here are the survey percents of Canadian private students who use government loans to finance their education by field of study:
Field of study Number of students Percent using government loans
Trades 942 45%
Design 599 53%
Health 5234 55%
Media/IT 3238 55%
Service 1378 60%
Other 2300 47%
1. (a) Construct the 6 by 2 table of counts from above table. (No need to round up to integers)
2. (b) Test the null hypothesis that the percent of students using government loans to finance their education does not vary with field of study. What is your conclusion? (significant level 0.05)
4. RecalltheexampleoflongleafpinetreesintheWadeTract.Wewantto examine whether the distribution of trees in the tract is random or not. First, we divide the tract into four equal parts, or quadrants, in the east-west direction. Call the four pars Q1 to Q4. Then we take a random sample of trees and count the number of trees in each quadrant. Here are the data:
1. (a) If the trees are randomly distributed, we expect to find 26 trees in each quadrant. Why? Explain your answer.
2. (b) However, we do not really expect to get exactly 26 trees in each quadrant. Why?
3. (c) Perform the goodness-of-fit test for these data to determine if these trees are randomly scattered. What is your conclusion. (significant level 0.05)
Quadrant Q1 Q2 Q3 Q4
Count 40 18 24 22

5. Kiplinger’s“BestValuesinPublicColleges”providesarankingofU.S.public colleges based on a combination of various measures of academics and affordability. We’ll consider a random collection of 40 colleges from Kiplinger’s 2011-2012 report and focus on the average debt in dollars at graduation (AvgDebt) and the percent of students who borrow (PercBorrow). Below is the output from R for the simple linear regression of AvgDebt on PercBorrow.
1. (a) State the least-squares regression line.
2. (b) Construct a 95% confidence interval for the slope. What does this interval tell you about the change in average debt for a change in the percent who borrow?
3. (c) At Miami University, 51% of the students borrow, and the average debt is $27,315. What is the residual?

You are the newly hired Director of Performance Improvement at the Brownville Memorial Hospital. You were hired to improve the hospital’s compliance with federal, state, and local regulations. Additionally you are responsible to ensure that all standards related to quality assurance, patient protections, infection control, safety, risk management, and staff education are followed. You report directly to the hospital Chief Executive Officer (CEO) and you oversee the Quality Assurance and Performance Improvement (QAPI) staff.
The CEO wants the hospital to upgrade to a higher patient centered medical home (PCMH) recognition level in 18 months. He has given you your first project which is to improve patient and family ratings on the hospital satisfaction survey. As you review previous Press Ganey Satisfaction Surveys you note that patients and families consistently rated the hospital staff poorly on providing information that made it easy to understand and improve their health. Many survey comments stated that patients “found the health information they were given confusing and did not know how to act on it.”
Brownville is a 500 bed hospital situated in a large metropolitan area with more than 750,000 residents, many of whom are Black, Asian, and Hispanic. 35% of the residents are foreign-born and speak a language other than English at home. The median household income is $35,000 per year and more than 30% of residents did not graduate from high school. The hospital provides primary care, specialty care, and support services to area residents with a large direct patient care staff (including physicians, nurses, physician assistants, medical assistants, nursing assistants, social workers, therapists, technologists, technicians, phlebotomists, and pharmacists).
To begin your first project, you have decided to develop and implement a long-term staff education program that will focus on “health literacy.” You and your staff will be rolling out this program to all hospital staff members. The first activity will be a workshop for all existing and new staff. You will deliver the workshop in person to small groups (40 staff members) over the next 2 months.
Your key areas of concern are that all staff (address 2 key areas for assignment):
● communicate clearly with patients
● utilize the patient friendly health education materials available and disseminate take-home materials
● address language and cultural differences (with support from translation services available through telephone)
● help patients to remember how and when to take their medicines
● encourage patients to ask questions
Therefore, you will develop a 20-minute (maximum) workshop presentation that clearly explains health literacy, key communication principles, and addresses 2 of your key areas of concern. You have decided to give the CEO a preview of your workshop at your next meeting so that he knows that you are dedicated to performance improvement.