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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In a clinical trial of a? vaccine, 10000 children were randomly divided into two groups. The...
In a clinical trial of a? vaccine, 10000 children were randomly
divided into two groups. The subjects in group 1? (the
experimental? group) were given the vaccine while the subjects in
group 2? (the control? group) were given a placebo. Of the 5000
children in the experimental? group, 74 developed the disease. Of
the 5000 children in the control? group, 107 developed the disease.
Determine whether the proportion of subjects in the experimenta
group who contracted the disease is less...
A group of volunteers are randomly divided into two groups. One group of participants takes a...
A group of volunteers are randomly divided into two groups. One
group of participants takes a pill each morning for a year which
contains antioxidants (Vitamins A, C, E, etc), while the other
group takes a placebo pill for the same time period. Following this
they are measured on a problem solving task given under stressful
conditions. The number of errors is counted during solution.
Results were:
GROUP 1 GROUP 2
ANTIOXIDANTS PLACEBO (CONTROL)
N = 14 ...
Human blood is largely divided in to four blood groups (A, B, AB, and O) and...
Human blood is largely divided in to four blood groups (A, B,
AB, and O) and also (separately) into
Rh-positive
and Rh-negative. (There are also some very rare blood groupings,
such as Mumbai, Lutheran, Kell, and Kipp.) This is very important
in medicine, since a person may die or suffer serious harm if they
receive a transfusion from an incompatible donor. According to the
Stanford University School of Medicine Blood Center, the
distribution of blood groups/types in the United States...
A sample obese adult males were randomly divided into two groups in a clinical program. In...
A sample obese adult males were randomly divided into two groups
in a clinical program. In the experimental group, participants were
involved in a vigorous 30-minute-per-day exercise program and also
given instructions on the importance of diet. The control group
only received the diet instructions. The program directors want to
determine if the exercise program had an impact on LDL cholesterol
levels. Below are the LDL cholesterol data after one month in the
program. What can be concluded with an...
Use SPSS ..... A pool of participants was randomly divided into four treatment groups. The groups...
Use SPSS .....
A pool of
participants was randomly divided into four treatment groups. The
groups were administered daily doses of vitamin C over a 12-month
period. The data in the table represents severity of cold and flu
viruses reported as a function of virus concentration in the blood.
In other words, the higher the concentration of virus, the more
severe the symptoms.Assume the sample sizes are
large and that the instrumentation to measure virus activity, used
an appropriate measurement....
Ten females were divided into two equal groups. One group was taught how to concentrate on...
Ten females were divided into two equal groups. One group was
taught how to concentrate on their breathing (a breathing
meditation). A second group was told to imagine that the day was
very hot and that they would be allowed to place their hand in cool
water. Both groups placed their right hand in buckets of ice water
for three minutes. Afterward, they rated their pain on a scale of
one to seven (with seven meaning intense pain). Analyze the...
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 α = .05, analyze the data using the
correct statistical procedure.
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...
6 women and 7 men were randomly divided into two groups, with 9 individuals in one...
6 women and 7 men were randomly divided into two groups, with 9
individuals in one group and 4 individuals in the other group.
a) Calculate the probability that there will be at least two
women in each of the groups.
b）Calculate the probability that there are at least five men in
the 9-person group, if we know that there is at least one women in
the 4-person group.
c) Calculate the expected value of the number of women in...
Twenty laboratory mice were randomly divided into two groups of 10. Each group was fed according...
Twenty laboratory mice were randomly divided into two groups of
10. Each group was fed according to a prescribed diet. At the end
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data in the following table justify the conclusion that the mean
weight gained on diet B was greater than the mean weight gained on
diet A, at the α = 0.05 level of significance? Assume normality.
(Use Diet B - Diet A.) Diet A...
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