STP 226. MODULE 8 HW

# STP 226. MODULE 8 HW - Q Li estion 1 2 out oF2 poinls Find...

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Unformatted text preview: Q Li estion 1 2 out oF2 poinls Find the conﬁdence interval specified. Assume that the population is normally distributed. A sociologist develops a test to measure attitudes about public tra nsportao'on, and 2? randomlyr selected subjects are given d'1e test. Their mean score is T62 and their standard deviation is 21.4. Construct [he 95% conﬁdence interval for the mean score of all such su bjecE. Selected Answer: 5 513' to 84.? Correct Answer: a 51? to 34.? Q Ll estion 2 2 out of2 poinls Find the requested value. A researcher wish es to estimate the mean resting heart rate for long-distance mnners. A random sample of 12 lung—m runners yields the following heart ratesr in beau per minute. ?653E9?36461 6537552535063 Use the data to obtain a point esljmate ofthe mean resting heart rate for all longr distance runners. Selected Answer: a 51? heals per minute Correct Answer: a 57".? heals per minute Q uestion 3 2 out oF2 poinls Find the conﬁdence interval specified. A sample of 35 people were randomly selected From among the workers in a shoe factory. The time taken ‘For each person to polish a ﬁnished shoe was measured. The sample mean was 4.? minutes. Assume d1atg = I141 minim Construct a 913% conﬁdence interval for the true mean lime, LI, to polish a shoe. Selected Answer: 9 4.5913481 minutes Correct Answer: '5‘ 4.5913481 minutes Q ”35th" 4 2 out oF2 poinls Find the necessary sample size. Weights ofmmen in one age group are normally distributed with a standard deviation G of 18 lb. A researcher wishes to estimate the mean weight of all women in this age group. Fin-cl how large a sample must be drawn in order to be 91] percent conﬁdent that the sample mean will not differ from d1e populaljon mean by more man 3.8 lb. Selectedhnswer: a 51 CorrectAnswer: a 51 Q Ll estion 5 2 out of2 poinls Find the specified twalue. For a t-curve wid'l df= 4, ﬁnd WILDE- Selected Answer: a 2.132 Correct Answer: a 2.132 ...
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