Please check answers. Thanks The correlation between the height and weight of ch
ID: 3234862 • Letter: P
Question
Please check answers. Thanks
The correlation between the height and weight of children aged 6 to 9 is found to be about r = 0.8. Suppose we use the height x of a child to predict the weighty of the child. We conclude that: about 80% of the time, age will accurately predict weight. the least-squares regression line of y on x would have a slope of 0.8. height is generally 80% of a child's weight. the fraction of variation in weights explained by the least-squares regression line of weight on height is 0.64. 20. A political party sends a mail survey to 1500 randomly selected registered voters in a community. The survey asks respondents to give an opinion about the job performance of the current President. Of the 1500 surveys sent out, 480 are returned, and of these, only 120 say they are satisfied with the President's job performance. The sample is the: 1500 randomly selected voters receiving the questionnaire. 480 surveys returned. voters in his district. 120 voters surveyed that are satisfied with the President's job performance. Import customs officials sometimes randomly select crates of cargo for close, but time-consuming, inspection. Suppose there are nine crates of cargo from the following companies, each containing several hundred items. Customs officials will randomly select four for close inspection. Ravenburg Corsair Sapphire Dallhoise Baggate Strommond Cherry port Foxwood Bamboro To do this, use the numerical labels attached to the previous names and the following list of random digits. Read the list of random digits from left to right, starting at the beginning of the list. 748803 12009 45287 71753 98236 66419 84533 11793 20495 05907 11384 The simple random sample is: 7483 Cherry port, Dallhoise, Foxwood, and Sapphire. Cherry port, Foxwood, Bamboro, and Strommond. 7488.Explanation / Answer
19. Answer : the fraction of variation in weights explained by the least square regression line of weight on height is 0.64
20. Answer : 1500 randomly selected voters receiving the questionnaire
21. Answer: Cherryport, Dalhousie, Foxwood and Sapphire
All answers given by you are correct