Question

1a.) Do employees perform better at work with music playing? The music was turned on during the working hours of a business with 45 employees. Their productivity level averaged 5.2. On a different day the music was turned off and there were 40 workers. The workers' productivity level averaged 4.8. What can we conclude at the .01 level, if computed p-value is 0.12?

a. Yes. Employees perform better at work when music playing.

b. No. Employees don’t perform better at work when music playing.

c. Not sufficient information to answer the question.

d. None of the above

1b.) Samples of Republicans and Democrats have been tested for their level of support for welfare reform and the null hypothesis has been rejected. What may we conclude?

a. The difference is significant; there are differences between the parties on this issue

b. The difference is significant; the parties are the same on this issue

c. The difference is not significant

d. A Type I error has occurred

1c.) From a University population, random samples of 145 men and 237 women have been asked if they have ever cheated in a college class. 8% of the men and 6% of the women said that they have. What is the appropriate test to assess the significance of this difference?

a. Test for the significance of the difference between two sample proportions, large samples.

b. Test for the significance of the difference between two sample proportions, small samples.

c. Test for the significance of the difference between two sample proportions, paired samples.

d. Test for the significance of the difference between two sample means, large samples.

Answer 1