An industrial psychologist is investigating the effects of work environment on employee attitudes. A group of 44 recently hired sales trainees were randomly assigned to one of 11 different home rooms - four trainees per room.
Each room is identical except for wall color, with 11 different colors used. The psychologist wants to know whether room color has an effect on attitude, and, if so, wants to compare the mean attitudes of the trainees assigned to the 11 room colors. At the end of the training program, the attitude of each trainee was measured on a 100-pt. scale (the lower the score, the poorer the attitude). How many treatments are in this study?
A) 44 B) 100 C) 11 D) 4
Q. 2A recent article in the paper claims that business ethics are at an all-time low. Reporting on a recent sample, the paper claims that 30 of all employees believe their company president possesses low ethical standards.
Suppose 20 of a company's employees are randomly and independently sampled. Assuming the paper's claim is correct, find the probability that more than eight but fewer than 12 of the 20 sampled believe the company's president possesses low ethical standards. Round to six decimal places.
A) 0.108193 B) 0.226286 C) 0.152990 D) 0.077376
Q. 3A Type I error occurs when we accept a false null hypothesis.
A) True B) False
Q. 4In a test of hypothesis, the sampling distribution of the test statistic is calculated under the assumption that the alternative hypothesis is true.
A) True B) False
Q. 5A random sample of 250 students at a university finds that these students take a mean of 15.8 credit hours per quarter with a standard deviation of 2.3 credit hours.
Estimate the mean credit hours taken by a student each quarter using a 90 confidence interval. Round to the nearest thousandth.
A) 15.8 .010 B) 15.8 .015 C) 15.8 .158 D) 15.8 .239
Q. 6A literature professor decides to give a 10-question true-false quiz. She wants to choose the passing grade such that the probability of passing a student who guesses on every question is less than .10.
What score should be set as the lowest passing grade?
A) 8 B) 7 C) 9 D) 6
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