Question

Part I: Two different firms design their own version of the same aptitude test, and a psychologist administers both versions to the same randomly selected subjects with the results given below. At the .05 significance, test the clam that both versions produce the same mean. Assume both populations are normal.

Test A(before) | 109 | 118 | 104 | 127 | 126 | 99 | 104 | 108 | 113 |

Test B (After) | 102 | 115 | 107 | 116 | 104 | 91 | 113 | 112 | 112 |

Claim:

Null Hypothesis:

Alternative Hypothesis:

Calculator Screen Name in Ti 183:

test statistics:

Pvalue/alpha conversion

decision:

Conclusion:

Part II Construct a 95% confidence interval for Ud, **the
mean difference of the before minus the after times. Interpret the
interval in a complete sentence.**

Answer #1

The difference of true means lieing between -3.138 to 11.318.

Problem: The IQ test scores of 45 seventh-grade girls
in a Midwest school district are below.
111
107 100
107 115
111
97
112
104
106 113
109 113
128 128
118
113 124
127 136
106 123
124
126
116 127
119
97
102 110
120
103 115
93
123
79
119 110
110
107 105
105 110
77 90
Here are the IQ test scores of 30 seventh-grade boys in the same
school district. Is there good evidence...

Open Three Hospitals data. SETUP: It is
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different from the number of injuries recorded in hospital 2. Given
the data your job is to confirm or disprove this assertion.
10. What test/procedure did you perform? (4
points)
a. Regression
b. Two sided t-test
c. One sided t-test
d. Confidence Interval
11. What is the statistical interpretation? (4
points)
a. Average of data is inconsistent with the claim
b. P-value...

Researchers in a 2015 study by Flannery et al. sought to
estimate the effectiveness of the seasonal influenza vaccine in
preventing acute respiratory infection (ARI). A total of 507
subjects from Texas who showed symptoms of ARI were recruited for
this study. The data provided show the result of each subject's
test for influenza.
Click to download the data in your preferred format.
CrunchIt! CSV Excel
JMP Mac-Text Minitab
PC-Text R ...

Historically, the MBA program at Whatsamattu U. has about 40% of
their students choose a Leadership major, 30% choose a Finance
major, 20% choose a Marketing major, and 10% choose no major. Does
the most recent class of 200 MBA students fit that same pattern or
has there been a shift in the choice of majors. Using the sample of
200 students (in the data file), conduct a Chi Square Goodness of
Fit test to determine if the current distribution...

While job opportunities for men and women are considerably more
balanced than they were 40 years ago, the career aspirations may
still differ. Is there a difference in majors chosen by men and
women? Using the sample of 200 MBA students (in the data file),
conduct a Chi Square Test of Independence to determine if one's
choice of major is independent of their gender. Use a .05
significance level.
ID
Gender
Major
Employ
Age
MBA_GPA
BS GPA
Hrs_Studying
Works FT...

4) In order to determine the best-selling style
of tennis rackets that are sold in State College, you have
collected data from all sporting goods stores in town. A tennis
racket is classified by both its head size and grip size. The Excel
sheet “Sales Data Tennis Rackets” in Module 3 contains the data you
collected for sales of tennis rackets. Each entry in the Excel
sheet represents the sale of one tennis racket. You will have to
separate your...

Bivariate Data & Probability
After completing the calculation by hand in Q1 you can use
Excel to check your answers before submitting. Q2 assesses your
general understanding of probability and linear associations using
Excel to analyse a large dataset.
Question 1
Covariance and Correlation
The table below shows a set of sample bivariate data. Calculate
the covariance and correlation coefficient by completing the below
table. Show all working.
X
Y
(X - )
(Y - )
(X - )(Y -...

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