Answer the next three questions with the following table. The relative cumulativ

Question

Answer the next three questions with the following table. The relative cumulative frequency table for the number of hours worked per week by 400 students is shown in this table. The number of students working 19 hours or less is: a. 80 b. 100 c. 20 d. 25 e. none of these The number of students working between 20 and 29 hours is: a. 80 b. 75 c. 200 d. 300 e. none of these The percent relative frequency of the (20 - 29) class is: a. 50% b. 30% c. 20% d. 75% e. none of these Which of the following corresponds to the Central Limit Theorem? a. The expected value of the estimator is equal to the parameter. b. The standard error of the estimator is equal to the standard deviation of the population. c. As the sample size gets larger, the estimator's value approaches the parameter's value. d. As the sample size gets larger, the sampling distribution of x-bar has a normal distribution. e. none of these. Which of the following corresponds to the property of Consistency? a. The expected value of the estimator is equal to the parameter. b. The standard error of the estimator is equal to the standard deviation of the population. c. As the sample size gets larger, the estimator's value approaches the parameter's value. d. As the sample size gets larger, the sampling distribution of x-bar has a normal distribution. e. none of these. Which of the following corresponds to the property of Unbiasedness? a. The expected value of the estimator is equal to the parameter. b. The standard error of the estimator is equal to the standard deviation of the population. c. As the sample size gets larger, the estimator's value approaches the parameter's value. d. As the sample size gets larger, the sampling distribution of x-bar has a normal distribution.

Explanation / Answer

Total number of students: n=600

9)

The total relative frequency of students working 19 hours or less is 0.05+0.25 = 0.30

So number of students working 19 hours or less is 400 *0.30 = 120

Answer: e

10)

The relative frequency of students working between 20 and 29 hours is 0.75.

So number of students working between 20 and 29 hours is 400 *0.75 = 300

Answer: d

11)

The percent relative frequency of the class (20 -29) is 0.75 * 100 = 75%

12)

Answer : d

13)

Answer : c

14)

Answer: a

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