To work in the word-processing department at Dewey, Cheatem, and Howe, a large center-city law firm, you must be able to type at least 80 words per minute. The director of the human resources department is revising the job description. The mean typing speed of 100 samples is 93 words per minute with a population standard deviation of 7 words per minute. Assume that typing speeds follow an approximately normal distribution. What is the confidence level of the interval (91.37, 94.63) for the mean number of words typed by word processors at his law firm? a. 95% b. 90% c. 99% d. 98%

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To work in the word-processing department at Dewey, Cheatem, and Howe, a large center-city law
firm, you must be able to type at least 80 words per minute. The director of the human resources
department is revising the job description. The mean typing speed of 100 samples is 93 words per
minute with a population standard deviation of 7 words per minute. Assume that typing speeds
follow an approximately normal distribution. What is the confidence level of the interval (91.37,
94.63) for the mean number of words typed by word processors at his law firm?
а. 95%
b. 90%
c. 99%
d. 98%
In a random sample of 500 women, 120 are college graduates. With what confidence can we assert
that between 22% and 26% of women are college graduates?
а. 14.75%
b. 76.98%
С. 2%
d. 24%
Which one of the following statements about a confidence interval is TRUE?
a. The width of confidence interval is increased when the sample size is decreased.
b. The width of confidence interval is increased when the sample size is increased.
c. The wider the confidence interval, the least precise the estimate of the population parameter
d. Changes in the required level of confidence, 1-alpha, do not affect the width of the confidence
interval.
Transcribed Image Text:Instruction: Please help me to answer all the questions correctly. To work in the word-processing department at Dewey, Cheatem, and Howe, a large center-city law firm, you must be able to type at least 80 words per minute. The director of the human resources department is revising the job description. The mean typing speed of 100 samples is 93 words per minute with a population standard deviation of 7 words per minute. Assume that typing speeds follow an approximately normal distribution. What is the confidence level of the interval (91.37, 94.63) for the mean number of words typed by word processors at his law firm? а. 95% b. 90% c. 99% d. 98% In a random sample of 500 women, 120 are college graduates. With what confidence can we assert that between 22% and 26% of women are college graduates? а. 14.75% b. 76.98% С. 2% d. 24% Which one of the following statements about a confidence interval is TRUE? a. The width of confidence interval is increased when the sample size is decreased. b. The width of confidence interval is increased when the sample size is increased. c. The wider the confidence interval, the least precise the estimate of the population parameter d. Changes in the required level of confidence, 1-alpha, do not affect the width of the confidence interval.
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