BUSN 5760

Final Exam

Question 1.

Ten subjects participate in a problem-solving experiment.  Two judges are asked to rank order the solutions with regard to their creativity (1=most creative, 10=least creative).  The experimenter wishes to know if the judges are in substantial agreement.  The rankings are shown below; what should the experimenter decide?  Construct a scatter diagram. Perform a correlation.
Describe the strength of the relationship between the judges.

Subject                 Judge 1                 Judge 2
1                          5                           4
2                          8                           9
3                          2                           2
4                          9                           8
5                          2                           3
6                           4                           3
7                           10                         10
8                           3                           4
9                           6                           6
10                          8                           8

Question 2.

An industrial psychologist asks a group of 15 assembly-line workers and 15 workers not on an assembly line (but doing similar work) to indicate how much they like their jobs on a nine-point scale (9=like, 1=dislike).  The results are as follows:

Assembly-line workers:   4  3  4  2  1  3  3  4  3  3  2  4  3  2  4
Other workers:                 6  5  7  5  5  7  6  8  7  6  6  6  7  5  7

Test the null hypothesis that the assembly line and other workers mean job satisfaction are equal by computing a t-test at the .05 level of significance. What are the findings? What is your conclusion

Question 3.

The experimenter is interested in the number of errors made by rats in a maze as a function of the kind of reward they are given.  Group 1 receives 100% water reward; Group 2 receives a sugar solution; and Group 3 receives beer.  Perform an ANOVA to determine if the difference among groups is likely to be statistically significant? Perform t-tests. Which groups have significantly different means at the .05 level of significance?

Group         1                 2                 3
4                 13               26
5                 15               21
3                 12               19
9                 15               21
6                 15               23
5                 13               24
7                 14               19

Question 4.

A market researcher is interested in who spends more time (in minutes) shopping (looking) in Victoria Secret.  The researcher recorded time of day they entered the store and recorded the time when the subject left.  Here is a sample of 15 men and women and their recorded time spent in the store.  The researcher’s null hypothesis is men and women spend equal amount of time.  Perform a t – test at the .05 level of significance.  What is the decision?  Conclusion?

Groups                       Time in minutes_______________________________

Men           9, 8, 12, 10, 11, 12, 10, 14, 9, 6, 10, 10, 6, 4, 6

Women      18, 19, 16, 32, 28, 18, 23, 25, 18, 17, 26, 15 26, 19, 25

Question 5.
Confidence Interval – Tea Bags Analysis
Prepare a recommendation of what action(s) should the company follow after the confidence interval is performed on the sample testing of tea bags.  What are the financial impact(s) for leaving the production machines as they are currently?
The company wants exactly 5.5 grams of tea in each bag.  Are the machines operating at their correct calibration?

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