MGMT305
HW #4- Assignment- Due March 20
th
Quiz- March 20
th
Problems:
Questions 1-9 are from Anderson Sweeney Williams, 11edition.
Chapter-10
1. #14. Are nursing salaries in Tampa, Florida, lower than those in Dallas, Texas? Salary data show staff nurses in Tampa earn less than staff nurses in Dallas (The Tampa Tribune, January 15,
2007). Suppose that in a follow-up study of 40 staff nurses in Tampa and 50 staff nurses in
Dallas you obtain the following results.
Tampa
Dallas
n
1
=40
n
2
=50
=$56,100 , s
1
=$6000
=$59,400,S
2
=$7000
a. Formulate hypothesis so that, if the null hypothesis is rejected, we can conclude that
salaries for staff nurses in Tampa are significantly lower than for those in Dallas.
Use α =
.05.
b. What is the value of the test statistic?
c. What is the p-value?
d. What is your conclusion?
Two-Sample T-Test and CI
Sample
N
Mean
StDev
SE Mean
1
40
56100
6000
949
2
50
59400
7000
990
Difference = mu (1) - mu (2)
Estimate for difference:
-3300
95% upper bound for difference:
-1020
T-Test of difference = 0 (vs <): T-Value = -2.41
P-Value = 0.009
DF = 87
14. a.
H
0
:
H
a
:
b.
c.
= 87.55
Rounding down, we will use a
t
distribution with 87 degrees of freedom. From the
t
table we see that
t
= -2.41 corresponds to a
p
-value between .005 and .01.
Exact
p
-value corresponding to
t
= -2.41 is .009.
d.
p
-value .05, reject
H
0
. We conclude that the salaries of staff nurses are lower in
Tampa than in Dallas.

2.
#16. The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based
on the highest level of education attained by the test taker’s parents. A research hypothesis was
that students whose parents had attained a higher level of education would on average score
higher on the SAT. During 2003, the overall mean SAT verbal score was 507 (The World
Almanac, 2004 ). SAT verbal scores for independent samples of students follow. The first sample
shows the SAT verbal test scores for students whose parents are college graduates with a
bachelor’s degree. The second sample shows the SAT verbal test scores for students whose
parents are high school graduates but do not have a college degree.(
SATVerbal.xls
)
a. Formulate the hypotheses that can be used to determine whether the sample data
support the hypothesis that students show a higher population mean verbal score on the
SAT if their parents attained a higher level of education.

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- Spring '08
- Priya
- Statistics, Normal Distribution, Null hypothesis, Statistical hypothesis testing, Tampa