Person
Before
After
Ho: ud >= 0
1
320
340
H1: ud < 0
2
390
380
3
420
470
tTest: Paired Two Sample for Means
4
510
510
5
610
630
Before
After
6
410
400
Mean
472.5
490
7
630
640
Variance
9784.09
11090.91
8
560
560
Observations
12
12
9
360
370
Pearson Correlation
0.97
10
430
440
Hypothesized Mean Difference
0
11
510
540
df
11
12
520
600
t Stat
2.33
P(T<=t) onetail
0.02 >.01
t Critical onetail
2.72
P(T<=t) twotail
0.04
t Critical twotail
3.11
conclusion
Do not Reject Null Hypothesis: There is evedence test scores increase if you take the GMAT prep course.
BUS 2810
Exam 3
Name Brian Ayers
RETEST SP07
100 points
Section 9 am class
Show ALL Null and Alternative Hypotheses, crtitical values, p values, calucated tests, and conclusions.
...
Problem 1: 15 points
A
GMAT prep course claim that taking their course will result in improved scores. A random sample of 12 people took the GMAT before
the course and than again after the GMAT prep course.
At the .01 significance level, can we conclude GMAT results improved?
Use an appropriate hypothesis test at the .01 significance level.
What is the pvalue?
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2.82
Sample
Weight
Test statistic
4.32
1
45.6
pvalue
0 > .01
2
47.7
population mean
90
3
47.6
Ho: u <= 50
sample std dev
1.63
4
46.3
sample size
10
5
46.2
H1: u> 50
6
47.4
Weight
7
49.2
8
50.8
Mean
47.78
9
47.5
Standard Error
0.51
10
49.5
Median
47.55
Mode
#N/A
Standard Deviation
1.63
Sample Variance
2.64
Kurtosis
0.29
Skewness
0.58
Range
5.2
Minimum
45.6
Maximum
50.8
Sum
477.8
Conclusion
Count
10
Do not reject Null Hypothesis: There is evidence that the mean weight of the bags is less than 50 pounds
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 Spring '07
 Wilson
 Statistics, Variance, Null hypothesis, Statistical hypothesis testing, Freshmen Sophomore Junior

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