Population Proportion

Question 1

The president of a bowling league wanted to estimate the average highest bowling score of all its 200 members. Instead of surveying all 200 members, she randomly selected 20 members and recorded their highest scores. She found the sample mean to be 237. What inference can she make based on the sample mean?

Revolt · Accepted Answer

The average of the highest games bowled in the league was 237.

Question 2

0.100.13✔ 0.31X 0.40

Revolt · Accepted Answer

✔ 0.31

Question 3

0.31X 0.6✔ 0.690.87

Revolt · Accepted Answer

✔ 0.69

Question 4

✔ 4.2X 5.17.68.1

Revolt · Accepted Answer

✔ 4.2

Question 5

equal to✔ less thanX more than

Revolt · Accepted Answer

✔ less than

Question 6

What is the minimum sample size, n, that he needs in order to meet these requirements? Complete the statements.

Revolt · Accepted Answer

The value of 3% represents the .: margin of error; In the formula n = (1 – ) • , the value of (1 – ) is .: 0.59; When n is calculated, the result after rounding is .: 1,033

Question 7

0.030.41✔ 0.59X 0.97

Revolt · Accepted Answer

✔ 0.59

Question 8

✔ 1,0331,750X 2,1782,519

Revolt · Accepted Answer

✔ 1,033

Question 9

Complete the statements to find the margin of error.

Revolt · Accepted Answer

✔ 800; The sample size in this problem is students.: 800; Estimate the population proportion as .: 0.31; (1 – ) = .: 0.69; When the margin of error is calculated using the formula E = z* , to the nearest tenth of a percent, the result is %.: 4.2

Question 10

Which confidence interval represents the estimated proportion of people willing to pay higher prices for gas?

Revolt · Accepted Answer

between 55.3% and 62.7%

Population Proportion Answers

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