What’s the logic of the Pearson’s rformula?
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What’s the logic of the Pearson’s rformula?
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- Here is the headline of an MPR news story, "MPR News/Star Tribune poll: 56 percent approve of Walz performance" Tim Pugmire | MPR News Feb 25, 2020. This story is from before the current COVID-19 crisis and we don't know how much opinions might have changed recently. A new MPR News/Star Tribune Minnesota Poll shows 56 percent of those surveyed said they approve of his job performance, 25 percent disapprove and 19 percent are unsure. The poll of 800 registered voters was conducted by Mason-Dixon Polling and Strategy from Feb. 17-19. There were at least six other questions asked in the poll, ranging from questions on spending priorities to questions on mining and marijuana legalization. Since there are many questions asked in the poll, we don't construct several confidence interval estimates for each proportion, we calculate the sample proportions and report one margin of error for the entire poll or survey. Choose the best response below for what the "margin of error" means. O It is a…Answer correcttly for upvote1 Suppose you want to conduct McNemar’s test to see if the prevalence of anemia changed significantly between baseline and follow-up in a single group of study participants (n=112) who were offered iron folic acid supplements between the two time points. The variables AnemiaPre and AnemiaPost are both 0-or-1 indicators of having anemia. Write out the complete SPSS syntax that you would use to obtain McNamar’s test.
- Here is the headline of an MPR news story, "MPR News/Star Tribune poll: 56 percent approve of Walz performance" Tim Pugmire | MPR News Feb 25, 2020. This story is from before the current COVID-19 crisis and we don't know how much opinions might have changed recently. A new MPR News/Star Tribune Minnesota Poll shows 56 percent of those surveyed said they approve of his job performance, 25 percent disapprove and 19 percent are unsure. The poll of 800 registered voters was conducted by Mason-Dixon Polling and Strategy from Feb. 17-19. There were at least six other questions asked in the poll, ranging from questions on spending priorities to questions on mining and marijuana legalization. Since there are many questions asked in the poll, we don't construct several confidence interval estimates for each proportion, we calculate the sample proportions and report one margin of error for the entire poll or survey. What margin of error would you report for this poll? Use a confidence level of…[SOA 146] A survey of 100 TV watchers revealed that over the last year:(i) 34 watched CBS.(ii) 15 watched NBC.(iii) 10 watched ABC.(iv) 7 watched CBS and NBC.(v) 6 watched CBS and ABC.(vi) 5 watched NBC and ABC.(vii) 4 watched CBS, NBC, and ABC.(viii) 18 watched HGTV and of these, none watched CBS, NBC, or ABC.Calculate how many of the 100 TV watchers did not watch any of the four channels (CBS, NBC, ABC or HGTV).Show full answers and steps to part d) & e) of the exercise. Please explain how you get to the answers without using stata, R or excel
- Consider that the results of a research study conclude that the “effect of social media use on anxiety depends on gender.” Which statement below is correct based on this conclusion? a. The research study uncovered a main effect of social media use, but no main effect of gender or interaction between gender and social media use. b. The research study uncovered a main effect of gender and interaction of gender and social media use, but not main effect of social media use. c. The research study uncovered an interaction between social media use and gender, but no main effects. d. The research study uncovered no main effects of gender or social media use, as well as no interaction between gender and social media use.In order to determine the effects of a new pill that is supposed to reduce hair loss, a researcher conducts the following experiment: 500 volunteer subjects (300 men and 200 women) all of which suffer some degree of hair loss are selected to participate in the study. The researcher gives to the women the real pill and the men a sugar pill, but only the researcher knows this.The results of the experiment are likely to be invalid mostly because the gender of the patient could be a confounding variable in this experiment. the subjects were volunteers. the subjects did not know if they were getting the real treatment. the treatment group and control group were not the same size. None of the aboveAn online clothing retailer is testing a new e-mail campaign by sending one version of the e-mail with the word “free” in the subject line (version A) to a group of 1,500 customers and another version of the e-mail with word “discount” in the subject line (version B) to a different group of 1500 customers. After tracking the responses to the two versions of the e-mail advertising, the retailer finds that 75 responded to version A and 105 responded to version B. At 0.05 significance level, can it be concluded that the response rate for version B is higher than the response rate to version A Determine which of the following formulations of the hypotheses is appropriate and enter the corresponding number in the answer text box. Index “a” refers to the population of the customers who respond to version A and index “b” refers to the population of customers who are responsive to version B. Identify and enter the number corresponding to the most appropriate formulation for the…
- The 2001 Patriot Act was enacted in response to the 9/11 terror attack (Loftus, 2011). Since intelligence failures like poorA company produces mood music, and wants to study the music and whther it substantially helps peoples mood. the first intern decides to survey adults, asking them if they are feeling cheerful at the moment. 280 adults who do not listen to the mood music are asked if they are feeling cheerful at the moment. 112 say they are. the intern then asks 172 adults who listen to mood music regurlarly of they are feeling cheerful: 87 say they are. The intern will only claim that the music enhances peoples mood if he can state with 95% certainty that the % of adult mood music listeners who feel cherful beats thes rest of the adult population more than 4% the Second intern surveys auldts who dont regurlarly listen to mood music and those who do and asks them to rate ther mood on a 0 to 10 sclae the results are as follow People who dont listen to the mood music: 5, 8, 3, 5 ,4,6,5,7,7,1,2,6,4,5,8,2,8,10,2,4,6 people who do listen to the mood music:…A psychologist develops a test to detect malingering in criminal defendants who have entered NGRI (not guilty by reason of insanity) pleas. (Malingering is faking psychological symptoms for the purpose of secondary gain, such as avoiding time in prison.) She wants her test to be able to distinguish between those who really are experiencing psychotic symptoms and those who are faking. She recruits 30 individuals from a local psychiatric facility. All 30 have been independently diagnosed with a psychotic disorder (with symptoms of hallucinations and delusions). The patients are group 1; they are given the test with instructions to respond honestly. The comparison group consists of 30 inmates at a local jail who have exhibited no significant signs of mental illness. The inmates are group 2; they are given the test with instructions to make it look like they are psychotic (i.e., that they have hallucinations and delusions). They are further told that they are trying to “fool the experts.”…