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Chapter 7: Q.21 (page 431)

A newspaper poll reported that 73%of respondents liked business tycoon Donald Trump. The number 73%is

(a) a population.

(b) a parameter.

(c) a sample.

(d) a statistic.

(e) an unbiased estimator.

Short Answer

Expert verified

73%is a descriptive measure that results from a sample.

Therefore, the correct answer is option (d).

Step by step solution

01

Given Information

A newspaper poll reported that 73%of respondents liked business tycoon Donald Trump.

02

Explanation

The population is the individuals that are being studied.

A sample is the part of the population from which information was actually collected.

A parameter is a descriptive measure for a population, while a statistic is a descriptive measure for a sample.

An unbiased estimator is an estimator whose average of all possible values is equal to the corresponding parameter.

Statistic

since 73%is a descriptive measure that results from a sample.

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Most popular questions from this chapter

A grocery chain runs a prize game by giving each customer a ticket that may win a prize when the box is scratched off. Printed on the ticket is a dollar value (\(500,\)100,\(10)or the statement, 鈥淭his ticket is not a winner.鈥� Monetary prizes can be redeemed for groceries at the store. Here are the distribution of the prize values and the associated probabilities for each prize:

Which of the following are the mean and standard deviation, respectively, of the winnings?
\)15.00,\(2900.00
(b) \)15.00,\(53.85
(c) \)15.00,\(26.9

(d) \)156.25,\(53.85

(e) \)156.25,$26.93

Which of the following statements about the sampling distribution of the sample mean is incorrect? (a) The standard deviation of the sampling distribution will decrease as the sample size increases.

(b) The standard deviation of the sampling distribution is a measure of the variability of the sample mean among repeated samples.

(c) The sample mean is an unbiased estimator of the true population mean.

(d) The sampling distribution shows how the sample mean will vary in repeated samples.

(e) The sampling distribution shows how the sample was distributed around the sample mean

The number of undergraduates at Johns Hopkins University is approximately 2000, while the number at Ohio State University is approximately 40,000. At both schools, a simple random sample of about 3%of the undergraduates is taken. Each sample is used to estimate the proportion p of all students at that university who own an iPod. Suppose that, in fact, p=0.80at both schools. Which of the following is the best conclusion?

(a) The estimate from Johns Hopkins has less sampling variability than that from Ohio State.

(b) The estimate from Johns Hopkins has more sampling variability than that from Ohio State.

(c) The two estimates have about the same amount of sampling variability.

(d) It is impossible to make any statement about the sampling variability of the two estimates since the students surveyed were different.

(e) None of the above

Hispanic workers A factory employs 3000 unionized workers, of whom 30%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.

Are the events 鈥渋n the labor force鈥� and 鈥渃ollege graduate鈥� independent? Justify your answer .
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