2.1 Wiley Plus

Q1 For this example, the 16.3% of people that identify as Hispanic or Latino would be denoted by

FALSE

Q7 In this exercise, a two-way table is shown for two groups, 1 and 2, and two possible outcomes, A and B. (a) What proportion of all cases had Outcome A? (b) What proportion of all cases are in Group 1? (c) What proportion of cases in Group 1 had Outcome B? (d) What proportion of cases who had Outcome A were in Group 2?

(a) 0.35 (70/200=0.35) (b) 0.25 (50/200=0.25) (c) 0.2 (10/50=0.2) (d) 0.429 (30/70=0.4285714286)

Q10 Help for Insomniacs A recent study shows that just one session of cognitive behavioral therapy can help people with insomnia.1 In the study, forty people who had been diagnosed with insomnia were randomly divided into two groups of 20 each. People in one group received a one-hour cognitive behavioral therapy session while those in the other group received no treatment. Three months later, 14 of those in the therapy group reported sleep improvements while only 3 people in the other group reported improvements. (a) Fill in the following two-way table for this data. (b) What proportion of the 40 people in the study reported sleep improvement? Round your answer three decimal places. (c) Of the people receiving the therapy session, what proportion reported sleep improvements? Round your answer three decimal places. (d) What proportion of people who did not receive therapy reported sleep improvements? Round your answer three decimal places. (e) If we use to denote the proportion from part (c) and use to denote the proportion from part (d), calculate the difference in proportion reporting sleep improvements, , between those getting therapy and those not getting therapy. Round your answer three decimal places.

(a) 0.425 (17/40) (b) 0.7 (14/20) (c) 0.15 (3/20) (d) 0.55 (0.7-0.15)

Q9 Who Smokes More: Males or Females The StudentSurvey dataset includes variables on gender and on whether or not the student smokes. Who smokes more: males or females? The following table shows a two-way table of these two variables. (a) Which gender has a higher percentage of smokers: males or females? (b) What is the percentage of smokers for the entire sample? Round your answer to one decimal place. (c) What percentage of the smokers in the sample are female? Round your answer to one decimal place. (When I found out the answer I wanted to throw my laptop and cry at the same time.)

(a) Males (b) 11.9 (c) 37.2 Basically after you get your decimal, muitiply it by 100 to get the final answer, and of course round.

Which of These Things Is Not Like the Other? Four students were working together on a project and one of the parts involved making a graph to display the relationship in a two-way table of data with two categorical variables: college accept/reject decision and type of high school (public, private, parochial). The graphs submitted by each student are shown in the figure below. Three are from the same data, but one is inconsistent with the other three. Which is the bogus graph?

Graph B is the bogus graph. which shows there are more parochial students than private school students. The other three graphs show that there are more private school students than parochial

Q6 In this exercise, data from the StudentSurvey dataset is given.Of the 361 students who answered the question about the number of piercings they had in their body, 188 had no piercings, 82 had one or two piercings, and the rest had more than two.Construct a relative frequency table of the data using the categories given.Click here for the dataset associated with this question.Give the relative frequencies rounded to three decimal places.

No piercings: 0.521 One or two: 0.227 More than two: 0.252 Total: 1 361-188, 361-82, 361-91. Add all the answers up and it totals to 1.

Q1 The correct notation for the sample proportion is:

P WITH THE HAT

Q2 This exercise provides information about data in a survey of students. The survey included 65 students who smoke and 303 who don't. Find , the proportion who smoke. Round your answer to three decimal places.

P= 0.177 P=65/(303+65)=0.17663 ~0.177 P with the hat

Q4 Give the relevant proportion using correct notation. A recent headline states that "45% Think Children of Illegal Immigrants Should Be Able to Attend Public School". The report gives the results of a survey of 1000 randomly selected likely voters in the US.1 1Rassmussen Reports, October 10, 2013.

P=0.45 P= 45/100 P with the hat

Q3 This exercise provides information about data in a survey of students. The math SAT score is higher than the verbal SAT score for 207 of the 360 students who answered the questions about SAT scores. Find , the proportion for whom the math SAT score is higher. Round your answer to three decimal places.

P=0.575 P= 207/360 P with the hat

Q5 Give the relevant proportion using correct notation. Of all 1,672,395 members of the high school class of 2014 who took the SAT (Scholastic Aptitude Test), 793,986 were minority students.1 1https://www.collegeboard.org/program-results/2014/sat.

p=0.475 It is literally "p" NOT "p with the hat. I`m so mad but at least I got it right on my last attempt lol. Again p is the correct notation. NOT p with the hat.

Q8 Home Field Advantage in Soccer In the book Scorecasting by Moskowitz and Wertheim,1 we learn that "Across 43 professional soccer leagues in 24 different countries spanning Europe, South America, Asia, Africa, Australia, and the United States (covering more than 66,000 games), the home field advantage [percent of games won by the home team] in soccer worldwide is 62.4%." What is the relevant statistical parameter, including correct notation? 1Moskowitz, T. and Wertheim, L., Scorecasting, Crown Archetype, New York, 2011, p. 113.

p=0.624 p without the hat is the correct notation