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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7)A researcher wishes to estimate, with 99% confidence, the population proportion of adults who think Congress...
7)A researcher wishes to estimate, with 99% confidence, the
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A researcher wishes to test claim that there is no difference in the life span of...
A researcher wishes to test claim that there is no difference in
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Nile Crocodile
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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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selected from each group. Their ages are recorded below. Can you
conclude that the distributions of teachers' ages at these
different levels of education are different? Use the Kruskal-Wallis
test. Use α = 0.05. Elementary 28,33,32,57,42,30 High school
41,46,43,52,47,36 Comm. College 44,50,41,66,50,40 need work
shown
A researcher believes that 7% of pet dogs in Europe are Labradors. If the researcher is...
A researcher believes that 7% of pet dogs in Europe are
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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
1414
5656
Total
105105
5656
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214214
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.
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
students. Can we conclude that freshman housing location and
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Location
Average
Below Average
Above Average
Total
On campus
7777
4242
3939
158158
Off campus
2828
1414
1414
5656
Total
105105
5656
5353
214214
Copy Data
Step 6 of 8 :
Find the critical value of the...
A researcher wishes to test claim that that the average cost of a coke in Mexico...
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a coke in Mexico is different than the average cost for a coke in
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Mexico
Russia
X ¯ 1 =1.26
s 1 =0.11
n 1 =14
X ¯ 2 =1.52
s 2 =0.09
n 2 =14
State the claim:
H 0 μ 1
H 1 μ 1≠ μ 2 claim...
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