Mathematics, 07.03.2020 02:30 caro74
Consider a binomial distribution of 200 trials with expected value 80 and standard deviation of about 6.9. Use the criterion that it is unusual to have data values more than 2.5 standard deviations above the mean or 2.5 standard deviations below the mean to answer the following questions.
(a) Would it be unusual to have more than 120 successes out of 200 trials? Explain.
Yes. 120 is more than 2.5 standard deviations above the expected value.
Yes. 120 is more than 2.5 standard deviations below the expected value.
No. 120 is less than 2.5 standard deviations above the expected value.
No. 120 is less than 2.5 standard deviations below the expected value.
(b) Would it be unusual to have fewer than 40 successes out of 200 trials? Explain.
Yes. 40 is more than 2.5 standard deviations above the expected value.
Yes. 40 is more than 2.5 standard deviations below the expected value.
No. 40 is less than 2.5 standard deviations above the expected value.
No. 40 is less than 2.5 standard deviations below the expected value.
(c) Would it be unusual to have from 70 to 90 successes out of 200 trials? Explain.
No. 70 to 90 observations is within 2.5 standard deviations of the expected value.
Yes. 70 to 90 observations is within 2.5 standard deviations of the expected value.
No. 90 observations is more than 2.5 standard deviations above the expected value.
Yes. 70 observations is more than 2.5 standard deviations below the expected value.
Answers: 1
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Amovie producer conducted a survey after the screening of his movie to find out how the film would be received by viewers from different age groups. the columns in the two-way table indicate the numbers of viewers who rated the film on a four-point scale: excellent, good, average, and poor. viewer's age group excellent good average poor marginal totals 16-25 52 42 12 7 113 26-35 33 50 5 9 97 36-45 58 12 28 34 132 which of these observations is supported by the data in the table? note: a rating of good or excellent means the audience liked the movie, while a rating of poor means the audience disliked the movie. a. the majority of the audience in the 26-35 age group disliked the movie. b. among those who liked the movie, the majority were in the oldest age group. c. among those who disliked the movie, the majority were in the 26-35 age group. d. the majority of the audience in the 16-25 age group liked the movie. e. the majority of the audience from all the age groups disliked the movie
Answers: 3
Consider a binomial distribution of 200 trials with expected value 80 and standard deviation of abou...
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