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Question
About 96
%
of all workers employed by the university belong to the workers’ union. Recently, the workers went on strike, and now a local TV station plans to interview a sample of 10
workers, chosen at random, to get their opinions on the strike.
Question
shopper is defined as a shopper for whom at least 70% of the items purchased were on sale or purchased with a coupon. In the following table, income units are in thousands of dollars, and each interval goes up to but does not include the given high value. The midpoints are given to the nearest thousand dollars.
Income range5-1515-2525-3535-4545-5555 or moreMidpoint x102030405060Percent of super shoppers20%14%21%17%18%10%
(a) Using the income midpoints x and the percent of super shoppers, do we have a valid probability distribution? Explain.
Yes. The events are indistinct and the probabilities sum to less than 1.
Yes. The events are distinct and the probabilities sum to 1.
No. The events are indistinct and the probabilities sum to more than 1.
Yes. The events are distinct and the probabilities do not sum to 1.
No. The events are indistinct and the probabilities sum to 1.
(b) Use a histogram to graph the probability distribution of part (a).
(c) Compute the expected income μ of a super shopper. (Round your answer to two decimal places.)
μ = thousands of dollars
(d) Compute the standard deviation σ for the income of super shoppers. (Round your answer to two decimal places.)
σ = thousands of dollars
Question
same expected value. Are the standard deviations of the two distributions necessarily equal? Explain.
Yes, because both distributions have the same sample space, they will have the same standard deviation as well.
No, the standard deviations of two different discrete probability distributions are never equal.
Yes, because both distributions have the same expected value, they will have the same standard deviation as well.
No, the individual probabilities may differ in a way that produces the same expected value but a different standard deviation.
Question
= 4 years
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