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Chapter 7: Q.66 (page 456)
The standard deviation of the average scores you get should be close to
(a) .
(b) .
(c) .
(d) .
(e) none of these.
The average score's standard deviation is.
The correct answer is (c).
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Sale of eggs that are contaminated with salmonella can cause food poisoning in consumers. A large egg producer takes an SRS of eggs from all the eggs shipped in one day. The laboratory reports thatof these eggs had salmonella contamination. Unknown to the producer, (one-tenth of 1%) of all eggs shipped had salmonella. Identify the population, the parameter, the sample, and the statistic.
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.
A large company is interested in improving the efficiency of its customer service and decides to examine the length of the business phone calls made to clients by its sales staff. A cumulative relative frequency graph is shown below from data collected over the past year. According to the graph, the shortest of calls will take how long to complete?
(a) Less than minutes.
(b) At least minutes.
(c) Exactly minutes.
(d) At least minutes.
(e) Less than minutes.
1) State whether it is a parameter or a statistic and (2)use appropriate notation to describe each
number; for example, p = 0.65.
Get your bearings A large container of ball bearings has mean diameter 2.5003 centimeters (cm). This is within the specifications for acceptance of the container by the purchaser. By chance, an inspector chooses 100 bearings from the container that have a mean diameter of 2.5009 cm. Because this is outside the
A researcher initially plans to take anSRS of size n from a population that has a mean of 80 and a standard deviation of . If he were to double his sample size (to ), the standard deviation of the sampling distribution of the sample mean would be multiplied by
(a) .
(b) .
(c) .
(d) .
(e)
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