Question
In: Statistics and Probability
A coach uses a new technique to train gymnasts. 7 gymnasts were randomly selected and their...
- A coach uses a new technique to train gymnasts. 7 gymnasts were randomly selected and their competition scores were recorded before and after the training. The results are shown below
|
Subject |
A |
B |
C |
D |
E |
F |
G |
|
Before |
9.6 |
9.7 |
9.7 |
9.4 |
9.7 |
9.5 |
9.5 |
|
After |
9.7 |
9.9 |
9.7 |
9.3 |
9.8 |
9.8 |
9.3 |
Using a 0.01 level of significance, test the claim that the training technique is effective in raising the gymnasts’ score.
Use the traditional method of hypothesis testing with critical value t= -3.143.
Solutions
orchestra answered 3 years agoRelated Solutions
A coach uses a new technique to train gymnasts. 7 gymnasts were randomly selected and their...
A coach uses a new technique to train gymnasts. 7
gymnasts were randomly selected and their competition scores were
recorded before and after the training. The results are shown
below
Subject A B
C D E F
G
Before 9.6 9.7 9.7 9.4 9.7 9.5 9.5
After 9.7 9.9 9.7 9.3 9.8 9.8
9.3
Using a 0.01 level of significance, test the claim that the
training technique is effective in raising the gymnasts’...
A coach uses a new technique to train gymnasts. 7 gymnasts were randomly selected and their...
A coach uses a new technique to train gymnasts. 7 gymnasts were
randomly selected and their competition scores were recorded before
and after the training. The results are shown below. Use a 0.01
significance level to test the claim that the training technique is
effective in rising the gymnasts’ scores.
Subject
A
B
C
D
E
F
G
Before
9.6
9.7
9.7
9.1
9.7
9.2
9.1
After
9.7
9.9
9.7
9.3
9.8
9.8
9.3
Question #4 A coach uses a new technique to train gymnasts. 7 gymnasts were randomly selected...
Question #4
A coach uses a new technique to train gymnasts. 7 gymnasts were
randomly selected and their competition scores were recorded before
and after the training. The results are shown below.
Before
9.4
9.0
9.2
9.4
9.2
9.3
9.7
After
9.5
9.3
9.5
9.6
9.4
9.5
9.9
Using a 0.10 level of significance and Critical Value method to
test the claim that the training technique is effective in raising
the gymnasts' scores. (Mean difference is less than zero)
A coach uses a new technique in training middle distance runners. The times for 9 randomly...
A coach uses a new technique in training middle distance
runners. The times for 9 randomly selected, independent athletes to
run 800 meters before and after this training are shown below.
Assume the distribution of differences are normally distributed
Before 115.2 120.9 108.0 112.4 107.5 119.1 121.3 110.8 122.3
After 116.0 119.1 105.1 111.9 109.1 115.1 118.5 110.7 120.9
Build and Interpret 90% confidence interval for the true mean
difference in 800-meter times.
A coach times 6 randomly selected runners to measure their times early in the week and...
A coach times 6 randomly selected runners to measure their times
early in the week and at the end of the week (in minutes). Using
the parts below, help the coach run a paired t-test to determine if
the runners were faster (had lower times) at the end of the week.
Use α = 0.05.
Runner
Monday time
Fridays time
1
26.2
25.8
2
25.2
24.9
3
24.8
24.9
4
24.1
24.6
5
25.9
25.2
6
25.1
24.5
A. State...
For a new study conducted by a fitness magazine, 240 females were randomly selected. For each,...
For a new study conducted by a fitness magazine,
240
females were randomly selected. For each, the mean daily calorie
consumption was calculated for a September-February period. A
second sample of
230
females was chosen independently of the first. For each of them,
the mean daily calorie consumption was calculated for a
March-August period. During the September-February period,
participants consumed a mean of
2385.3
calories daily with a standard deviation of
206
. During the March-August period, participants consumed a...
For a new study conducted by a fitness magazine,285 females were randomly selected. For each, the...
For a new study conducted by a fitness magazine,285 females were
randomly selected. For each, the mean daily calorie consumption was
calculated for a September-February period. A second sample of 275
females was chosen independently of the first. For each of them,
the mean daily calorie consumption was calculated for a
March-August period. During the September-February period,
participants consumed a mean of 2383.5 calories daily with a
standard deviation of 208. During the March-August period,
participants consumed a mean of...
For a new study conducted by a fitness magazine, 270 females were randomly selected. For each,...
For a new study conducted by a fitness magazine, 270 females
were randomly selected. For each, the mean daily calorie
consumption was calculated for a September-February period. A
second sample of 285 females was chosen independently of the first.
For each of them, the mean daily calorie consumption was calculated
for a March-August period. During the September-February period,
participants consumed a mean of 2387.2 calories daily with a
standard deviation of 216. During the March-August period,
participants consumed a mean...
For a new study conducted by a fitness magazine, 240 females were randomly selected. For each,...
For a new study conducted by a fitness magazine,
240
females were randomly selected. For each, the mean daily calorie
consumption was calculated for a September-February period. A
second sample of
210
females was chosen independently of the first. For each of them,
the mean daily calorie consumption was calculated for a
March-August period. During the September-February period,
participants consumed a mean of
2385.5
calories daily with a standard deviation of
222
. During the March-August period, participants consumed a...
The following sample observations were randomly selected:
The following sample observations were randomly selected:12345X:213832Y:18132249 a. Not available in Connect.b. Determine the regression equation.(Negative answer should be indicated by a minus sign. Do
not round intermediate calculations. Round the final answers to 4
decimal places.) b = a =Y' = + X c. Determine the value of Y' whenX is 11. (Do not round intermediate calculations.
Round the final answer to 4 decimal places.)
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