Question
Statistics
Final Exam
1. In no fewer than 200 words explain why one can never prove
on the basis of sample evidence that the Null Hypothesis is “true.
(20 points)
2. A research study was conducted to examine the efficacy of
studying in groups. Students were randomly assigned to one of two
groups: a single person group (individual studying) and a group
that had three study partners. After four weeks of studying, the
students were given an exam. The raw scores on the exam are below.
Construct a hypothesis test. (20 points)
Group 1
Group 2
78
82
87
79
76
82
65
83
92
81
78
90
77
89
88
79
85
83
92
81
a. State the null and research hypothesis
b. Set the level of risk
c. Select the appropriate test
d. Compute the obtained value.
e. Find the critical value
f. Compare the obtained value and the critical value.
g. State your decision.
h. Write the result
Verbal Interpretation
X
Persuasion
Y
62
67
64
66
58
65
68
74
72
78
63
69
65
65
63
66
3. Using Excel make a scatter plot of the data above, label the
dependent and independent variable and show the trend line. (20
points)
4. Using the data in the table what is the correlation
between verbal interpretation and persuasion and describe if the
relationship is direct or indirect, very strong, strong, moderate
or negligible. (20 points)
5. What would you predict the persuasion value to be if the
verbal interpretation score is 58? (20 points)
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