Question
In: Statistics and Probability
ab Company, they’ve randomly divided the company’s cabs into two groups of equal size. Graphlex was...
ab Company, they’ve randomly divided the company’s cabs into two groups of equal size. Graphlex was added to the engine oil of the 45 cabs in the experimental group, while the 45 cabs in the control group continued to operate with the usual lubricant. Drivers were not informed of the experiment. After 1 month, fuel efficiency records were examined. For the 45 cabs using Graphlex, the average cab achieved 18.94 miles per gallon (mpg), with a standard deviation of 3.90 mpg. For the 45 cabs not using Graphlex, the average mpg was 17.51, with a standard deviation of 2.87 mpg. Graphlex is preparing a national advertising campaign to promote its ability to improve fuel efficiency. Assuming normality, perform a hypothesis test to determine whether cabs using Graphlex (group 1) get better fuel economy than cabs without it (group 2). Use the ߙ ൌ 0.05 level of significance.
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A pool of participants was randomly divided into FIVE treatment groups. The groups were administered daily...
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0mg
250mg
500mg
1000mg
2000mg
6
3
3
4
1
5
4
3
1
0
3
4
5
2...
A pool of participants was randomly divided into FIVE treatment groups. The groups were administered daily...
A pool of participants was randomly divided into FIVE treatment
groups. The groups were administered daily doses of vitamin C over
a 12-month period. The data in the table represents the number of
cold and flu viruses reported by the participant as a function of
their vitamin C dosage. Using a=.05, analyze the data using the
correct statistical procedure.
0mg
250mg
500mg
1000mg
2000mg
6
5
3
4
3
2
3
5
3
3
3
4
4
5
4
3...
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