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Chapter 7: Q.65 (page 456)
The mean of the average scores you get should be close to
(a) .
(b) .
(c) .
(d) .
(e) none of these.
The correct answer is (a).
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Cold cabin? The Fathom screenshot below shows the results of taking SRSs of temperature readings from a population distribution that’s and recording the sample minimum each time.
(a) Describe the approximate sampling distribution.
(b) Suppose that the minimum of an actual sample is . What would you conclude about the thermostat manufacturer’s claim? Explain.
The number of unbroken charcoal briquets in a twenty-pound bag filled at the factory follows a Normal distribution with a mean ofbriquets and a standard deviation of briquets. The company expects that a certain number of the bags will be underfilled, so the company will replace for free the 5% of bags that have too few briquets. What is the minimum number of unbroken briquets the bag would have to contain for the company to avoid having to replace the bag for free?
(a)
(b)
(c)
(d)
(e)
Graph the population distribution. Identify the individuals, the variable, and the parameter of interest.
The histogram above left shows the intervals (in minutes) between eruptions of the Old Faithful geyser for all recorded eruptions during a particular month. For this population, the median is minutes. We used Fathom software to take SRSs of size from the population. The values of the sample median are displayed in the histogram above right. The mean of the sample median values is 73.5.
Is the sample median an unbiased estimator of the population median? Justify your answer
Hispanic workers A factory employs 3000 unionized workers, of whom are Hispanic. The 15 -member union executive committee contains 3 Hispanics. What would be the probability of 3 or fewer Hispanics if the executive committee were chosen at random from all the workers?
CHALLENGE: See if you can compute the probability using another method.
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