Question

Problem 9. A researcher studied how two diets compare in terms of weight loss after 6 months. 40 people used the first diet. Their sample mean was 44, and their sample standard deviation was 10. 60 people used the first diet. Their sample mean was 37, and their sample standard deviation was 15. Give the 92% confidence interval for the true difference between the mean weight losses.

Problem 10. Refer to the information in Problem 9. Can we conclude that the two diets really differ in terms of the mean weight loss?

Answer #1

6) A researcher studied how two diets compare in terms of weight
loss after 6 months. 40 people used the first diet. Their sample
mean was 44, and their sample standard deviation was 10. 60 people
used the first diet. Their sample mean was 37, and their sample
standard deviation was 15. Give the 92% confidence interval for the
true difference between the mean weight losses.
7)
Refer to the information in the previous
question.
Can we conclude
that...

A researcher studied how two diets compare in terms of weight
loss after 6 months.
40 people used the first diet.
Their sample mean was 44, and their sample standard deviation was
10.
60 people used the first
diet. Their sample mean was 37, and their sample standard deviation
was 15.
Give the 92% confidence interval
for the true difference between the mean weight losses.
Can we conclude that the two diets really differ in terms of...

are low fat diets or low carb diets more effective for weight
loss? a sample of 70 subjects went on a low carbohydrate diet for 6
months. a the end of that time, the sample mean weight loss was
10.5 pounds with a sample standard deviation of 7.09 pounds. a
second sample of 76 subjects went on a low fat diet. their sawith a
sample mean weight loss was 18.0 with a standard deviation of 7.26.
test the claim that...

Are low-fat diets or low-carb diets more effective for weight
loss? A sample of 46 subjects went on a low-carbohydrate diet for
six months. At the end of that time, the sample mean weight loss
was 4.6 kilograms with a sample standard deviation of 6.28
kilograms. A second sample of 49 subjects went on a low-fat diet.
Their sample mean weight loss was 2.3 kilograms with a standard
deviation of 4.66 kilograms. Can you conclude that the mean weight
loss...

Low-fat or low-carb? Are low-fat diets or low-carb diets more
effective for weight loss? A sample of 77 subjects went on a
low-carbohydrate diet for six months. At the end of that time, the
sample mean weight loss was 4.7 kilograms with a sample standard
deviation of 7.16 kilograms. A second sample of 79 subjects went on
a low-fat diet. Their sample mean weight loss was 2.6 kilograms
with a standard deviation of 5.90 kilograms. Can you conclude that
the...

A study was conducted in order to compare the weight loss for
two diet plans, Plan A and Plan B. Two hundred dieters were
randomly selected. Of this sample 100 were placed on the Plan A
diet and the remaining 100 were assigned to the Plan B diet. After
the dieters were on the diet for 2 months the average weight loss
and sample standard deviation of the weight losses were recorded.
For the Plan A group there was an...

Are low-fat diets or low-carb diets more effective for weight
loss? A sample of 70 subjects went on a low-carbohydrate diet for
six months. At the end of that time, the sample mean weight loss
was 10.5 pounds with a sample standard deviation of 7.09 pounds. A
second sample of 76 subjects went on a low-fat diet. Their sample
mean weight loss was 18.0 with a standard deviation of 7.26. Can
you conclude that their was no difference in the...

1. In order to compare two diets, 75 individuals were randomly
assigned to one of the diets. The weight loss (in kg) was recorded
for each subject. Summary data is given below.
Sample Size Diet A 40
Diet B 35
Mean Standard Dev 4.2 2.1
3.2 2.7
(a) Use an appropriate procedure, with justification, to test if
the mean weight loss differs for the two diets (alpha = 0.01).
(b) Construct a 95% confidence interval for the difference of
mean...

Find the test statistic for the t test and state the
conclusion. Are low-fat diets or low-carb diets more
effective for weight loss? A sample of 78 subjects went on a
low-carbohydrate diet for six months. At the end of that time, the
sample mean weight loss was 15.0 pounds with a sample standard
deviation of 7.77 pounds. A second sample of 74 subjects went on a
low-fat diet. Their sample mean weight loss was 16.3 with a
standard deviation of...

Determine the test used for the following problem: Does the
standard deviation in the weight loss of dieters who follow the
low-carb diet differ from the standard deviation of the dieters who
follow the low-fat diet?

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