Question

1.

A three-digit number is formed from nine numbers (1, 2, 3, 4, 5, 6, 7, 8 & 9). No number can be repeated. How many different three-digit numbers are possible if 1 and 2 will not be chosen together?

Select one:

A. 672

B. 210

C. 462

D. 336

2.

In a recent survey conducted by a professor of UM, 200 students were asked whether or not they have a satisfying experience with the e-learning approach adopted by the school in the current semester. Among the 200 students interviewed, 121 said they have a satisfying experience. What is the 99% confidence interval for the proportion of all UM students who have a satisfying experience with the e-learning approach?

Select one:

A. 0.537 to 0.673

B. 0.548 to 0.662

C. 0.516 to 0.694

D. 0.524 to 0.686

3.

Suppose a professor wants to estimate the proportion of UM students who have a satisfying experience with the e-learning approach adopted by the school in the current semester. What is the minimum sample size that he should use if he wants the estimate to be accurate within 0.06 with a 90% confidence?

Select one:

A. 188

B. 267

C. 456

D. 752

4.

According to a poll on customer behavior, 30% of people say they will only consider cars manufactured in their country when purchasing a new car. Suppose you select a random sample of 180 respondents. The probability is 80% that the sample percentage will be contained within what symmetrical limits of the population percentage?

Select one:

A. 25.6% and 34.4%

B. 27.1% and 32.9%

C. 24.4% and 35.6%

D. 23.3% and 36.7%

Answer 1