Tennis magazine (feb. 2000) claims that “tennis players who tie the knot often see their games unravel.” (in other words the player’s game worsens just after marriage) use data in ‘tennis’ sheet which lists a sample of former players and their rankings on their wedding days and on their first anniversaries. (if you are interested, try reading a journal article by farrelly and nettle. it discusses some topics which we did not cover in class though! ) a. construct a scattergram from the given data. does it tend to support, or refute the magazine’s claim? justify your answer. b. use simple linear regression to model the relationship between wedding day ranking (x) and first anniversary ranking (y). c. does the linear model you developed in part b contribute information for predicting players’ rankings on their first anniversaries? test at 5% significance level. d. if the player rankings don’t change (on average) after getting married, what would the true values of β0 and β1 be?

Apoll is being conducted at a mall nothingto obtain a sample of the population of an entire country. what is the frame for this type of​ sampling? who would be excluded from the survey and how might this affect the results of the​ survey? what is the frame for this type of​ sampling? a. the frame is people who need new clothes. b. the frame is people who shop at the mall. c. the frame is people who like to shop. d. the frame is the entire population of the country. who would be excluded from the survey and how might this affect the results of the​ survey? a. any person that does not need new clothes is excluded. this could result in sampling bias due to undercoverage. b. any person who does not shop at the mall is excluded. this could result in sampling bias due to undercoverage. c. any person who does not shop at the mall is excluded. this could result in nonresponse bias due to people not participating in the poll. d. there is nobody that is being excluded from the survey.