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Chapter 7: Q. 7.1 (page 438)

A study of voting chose 663 registered voters at random shortly after an election. Of these, 72%said they had voted in the election. Election records show that only 56%of registered voters voted in the election. Which of the following statements is true?

a. 72%is a sample; 56%is a population.

b. 72%and 56%are both statistics.

c. 72%is a statistic and 56%is a parameter.

d. 72%is a parameter and 56%is a statistic.

e. 72%and 56%are both parameters.

Short Answer

Expert verified

(c)72%is a statistic and 56%is a parameter.

Step by step solution

01

Given Information

Shortly after an election, a voting study randomly selected 663 registered voters.

02

Explanation for correct option

A statistic is a descriptive measure for a sample, whereas a parameter is a descriptive measure for a population. Because the proportion is based on a research of 663 randomly selected voters, 72 percent is a statistic.

The parameter is 56 percent The reason for this is that the percentage is calculated using ALL registered voters.

As a result, the best solution is (c)

03

Explanation for incorrect option

a. 72%is a sample; 56%is a population is not the true statements .

b. 72%and 56%are both statistics is not the true statements .

d. 72%is a parameter and 56%is a statistic is not the true statements .

e. 72%and 56%are both parameters is not the true statements .

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Most popular questions from this chapter

According to the U.S. Census, the proportion of adults in a certain county who owned their own home was 0.71. An SRS of 100 adults in a certain section of the county found that 65 owned their home. Which one of the following represents the approximate probability of obtaining a sample of 100 adults in which 65 or fewer own their home, assuming that this section of the county has the same overall proportion of adults who own their home as does the entire county?

a. (10065)(0.71)65(0.29)3510065(0.71)65(0.29)35

b. (10065)(0.29)65(0.71)3510065(0.29)65(0.71)35

c.

P(z≤0.65-0.71(0.71)(0.29)100)Pz≤0.65-0.71(0.71)(0.29)100

d.P(z≤0.65-0.71(0.65)(0.35)100)Pz≤0.65-0.71(0.65)(0.35)100

e.P(z≤0.65-0.71(0.71)(0.29)100)Pz≤0.65-0.71(0.71)(0.29)100

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The amount that households pay service providers for access to the Internet varies quite a bit, but the mean monthly fee is 50\( and the standard deviation is 20\). The distribution is not Normal: many households pay a low rate as part of a bundle with phone or television service, but some pay much more for Internet only or for faster connections. 11 A sample survey asks an SRS of 50 households with Internet access how much they pay. Let x-x¯be the mean amount paid.

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