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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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The five-number summary for a data set is given by , , , , . If you wanted to construct a modified boxplot for the data set (that is, one that would show outliers, if any existed), what would be the maximum possible length of the right-side 鈥渨hisker鈥�? (a) (b)(c) (d) (e)
Cold cabin? The Fathom screenshot below shows the results of taking SRSs of temperature readings from a population distribution that鈥檚 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鈥檚 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)
The candy machine Suppose a large candy machine has orange candies. Use Figure 7.13 (page 435) to help answer the following questions.
(a) Would you be surprised if a sample of 25 candies from the machine contained 8 orange candies (that's orange)? How about 5 orange candies ( orange)? Explain.
(b) Which is more surprising: getting a sample of 25 candies in which are orange or getting a sample of 50 candies in which are orange? Explain.
Larger sample Suppose that the blood cholesterol level of all men aged follows the Normal distribution with mean milligrams per deciliter (mg/dl) and standard deviation
(a) Choose an SRS of men from this population What is the sampling distribution of ?
(b) Find the probability that estimates within . (This is the probability thattakes a value between .) Show your work.
(c) Choose an SRS of men from this population. Now what is the probability that falls withinof? show your wrok.in what sense is the large sample "better".
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