ST aisintre to Sca istical Reasoning. Mw spring 17.25153 Quiz: Quiz 3 (Chapters
ID: 3218943 • Letter: S
Question
ST aisintre to Sca istical Reasoning. Mw spring 17.25153 Quiz: Quiz 3 (Chapters 12, 15, 16, 17) This Question: 1 pt 17 of 21 (2 This Quiz: 21 pts possible Acatalog sales company promises to deliver orders placed on the Internet within 3 days Follow up aalsto show that a 95% coldenceintena teproportion 78% 8%. What does this mean?For each conclusion, state whether toatew parts a through e below. it is corect or not and explain why Complete ol al orders that arrive on tmeis a) Between T0% and 86% of al orders anive on time. State whether the conckiesion is comect or not and explain why Choose the corect answer below A The statement is comect assuming that al conditions and assumptions are met. B. The statement is not conect because exactly 78% orders amive on time. O C. The statement is not corect because the interval is from 74.0% to 82.0% O D. The statement is not correct because it implies certainty Ninety-five percent of all random samples of customers will show that T8% of orders arrive on time. is conect or not and explain why Choose the comect answer below State whether the conclusion O A. The statement is comect, assuming that all conditions and assumptions are met. o B. The statement is not correct Much less than 99% of random samples will show that exactly Ta%of orders amive on time O c. The statement is not correct None ofthe andom samples wil show that exactly 78%of orders amve on time O D. The statement is not correct A of the random samples wil show that exactly 78% of orders amive on time that arrive within 3 is 1219 oExplanation / Answer
(a)
Answer: (D) This statement is not correct because it implies certainity. (It is talking about all orders certainly)
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(b)
Answer: (C) This statement is not correct. Much less than 95% of all random samples will show that exactly 78% of orders arrive on time.
(The sample proportion might vary from sample to sample)
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(c)
Answer: (A) This statement is not correct. The interval estimates the population proportion, not the sample proportion.
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(d)
Answer: (C) This statement is not correct. One can never be certain of the exact sample proportion.
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(e)
Answer: (C) This statement is not correct. The interval is about the proportion, not the days.
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