Question
In: Statistics and Probability
7. Suppose a researcher wishes to discern if there is a significant difference in the running...
7. Suppose a researcher wishes to discern if there is a
significant difference in the running times of two computer programs.
He performs a hypothesis test with the null hypothesis being that
there is no difference in their average running times, and the
alternative hypothesis being that there is a difference. The
signficance level is set at α =0.05. The first program was run n1 = 5
times with an average running time of ¯ x1 = 53.72 seconds and a
sample standard deviation of s1 = 11.72 seconds. The second program
was run n2 = 6 times with an average running time of ¯ x2 =60.64
seconds and a sample standard deviation of s2 =8.21 seconds. What
conclusion should the researcher reach? Hints: You may estimate the
difference of means as a t-distribution with 4 degrees of freedom.
You may use the following formula for the standard error
SE¯ x2−¯ x1 =ss2 1 n1
+ s2 2 n2
Solutions
orchestra answered 2 years agoRelated Solutions
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X ¯ 1 = 45
s 1 ==2.6
n 1 =12
X ¯ 2 =44
s 2 =6.5
n 2 =10
State the claim:
H 0 μ 1 claim
H 1 μ...
2. A researcher wishes to test the claim that there is a difference in the distribution...
2. A researcher wishes to test the claim that there is a
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shown
A researcher believes that 7% of pet dogs in Europe are Labradors. If the researcher is...
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If the researcher is right, what is the probability that the
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An educational researcher wishes to know if there is a difference in academic performance for college...
An educational researcher wishes to know if there is a
difference in academic performance for college freshmen that live
on campus and those that commute. Data was collected from 214214
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academic performance are related?
Location
Average
Below Average
Above Average
Total
On campus
7777
4242
3939
158158
Off campus
2828
1414
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5656
Total
105105
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Copy Data
Step 1 of 8 :
State the null and alternative hypothesis....
An educational researcher wishes to know if there is a difference in academic performance for college...
An educational researcher wishes to know if there is a
difference in academic performance for college freshmen that live
on campus and those that commute. Data was collected from 336
students. Can we conclude that freshman housing location and
academic performance are related?
Location Average Below
Average Above Average Total
On campus 99 89 89 277
Off campus 41 10 8 59
Total 140 99 97 336
Step 1 of 8: State the null and alternative hypothesis.
Step 2 of...
A researcher at a major hospital wishes to estimate the proportion of the adult population of...
A researcher at a major hospital wishes to estimate the
proportion of the adult population of the United States that has
high blood pressure. How large a sample is needed to be 90%
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proportion by more than 5%
A. If no preliminary estimate is available
B. If a recent survey indicated that 43% of the population
suffers from high blood pressure.
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difference in academic performance for college freshmen that live
on campus and those that commute. Data was collected from 214214
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Below Average
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Off campus
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1414
1414
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Total
105105
5656
5353
214214
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Step 6 of 8 :
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X ¯ 1 =1.26
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X ¯ 2 =1.52
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n 2 =14
State the claim:
H 0 μ 1
H 1 μ 1≠ μ 2 claim...
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