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Chapter 7: Q.21 (page 431)
A newspaper poll reported that of respondents liked business tycoon Donald Trump. The number is
(a) a population.
(b) a parameter.
(c) a sample.
(d) a statistic.
(e) an unbiased estimator.
is a descriptive measure that results from a sample.
Therefore, the correct answer is option (d).
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Suppose we select an SRS of size from a large population having proportion p of successes. Let be the proportion of successes in the sample. For which value of p would it be safe to use the Normal approximation to the sampling distribution of ?
(a)
(b)
(c)
(d)
(e)
Run a mile During World War II, able-bodied male undergraduates at the University of Illinois participated in required physical training. Each student ran a timed mile. Their times followed the Normal distribution with mean minutes and standard deviation minute. An SRS of of these students has mean time minutes. A second SRS of sizehas mean minutes. After many SRSs, the values of the sample mean x follow the Normal distribution with mean minutes and standard deviationminute.
(a) What is the population? Describe the population distribution. (b) Describe the sampling distribution of x. How is it different from the population distribution?
For Exercises 1 to 4, identify the population, the parameter, the sample, and the statistic in each setting
Hot turkey Tom is cooking a large turkey breast for a holiday meal. He wants to be sure that the turkey is safe to eat, which requires a minimum internal temperature of . Tom uses a thermometer to measure the temperature of the turkey meat at four randomly chosen points. The minimum reading in the sample is
For each boldface number in Exercises 5 to 8, (1) state whether it is a parameter or a statistic and (2) use appropriate notation to describe each number; for example, p = 0.65
Florida voters Florida has played a key role in recent presidential elections. Voter registration records show that 41% of Florida voters are registered as Democrats. To test a random digit dialing device, you use it to call 250 randomly chosen residential telephones in Florida. Of the registered voters contacted, 33% are registered, Democrats
In the language of government statistics, you are “in the labor force” if you are available for work and either working or actively seeking work. The unemployment rate is the proportion of the labor force (not of the entire population) who are unemployed. Here are data from the Current Population Survey for the civilian population aged years and over in a recent year. The table entries are counted by thousands of people.
Unemployment () Find the unemployment rate for people with each level of education. How does the unemployment rate change with education?
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