Question

- A group of 78 people enrolled in a weight-loss program. They also had to adhere to a regular exercise program. After six months, the mean weight loss was 25 pounds with a standard deviation of 9 pounds. A second group of 43 people enrolled in the same program with the exception of regular exercise. After six months, their mean weight loss was 14 with standard deviation 7 pounds. Construct a 99% confidence interval for the mean difference in weight losses.

Answer #1

researchers studied the effects of adding an exercise program to
dieting in the achievement of weight loss. A sample of 75 men ages
18-20 (Group 1) were observed for weight loss using a diet only,
and another indeperndent sample of 66 men ages 18-20 (Group 2) were
put on the same diet, but with an added exercise program. The mean
weight loss of Group 1 was 9.5 pounds with a standard deviation of
4 pounds, and the eman weight loss...

Forty adults participated in a new weight loss program for 12
months. The mean weight loss was found to be 2.1 lb. with a
standard deviation of 4.8 lb. Construct a 90% confidence interval
for the true mean weight loss for all people who participate in the
program.

Researchers studied the effects of adding an exercise program to
dieting in the achievement of weight loss. A sample of
45 men ages 18-20 (Group 1) were observed for
weight loss using a diet only, and another independent sample of
52 men ages 18-20 (Group 2) were put on the same
diet, but with an added exercise program. The mean weight loss for
Group 1 was 5.7 pounds with a standard deviation of 5.4 pounds, and
the mean weight loss...

Researchers studied the effects of adding an exercise program to
dieting in the achievement of weight loss. A sample of
45 men ages 18-20 (Group 1) were observed for
weight loss using a diet only, and another independent sample of
52 men ages 18-20 (Group 2) were put on
the same diet, but with an added exercise program. The mean weight
loss for Group 1 was 7.1 pounds with a standard deviation of 5.2
pounds, and the mean weight loss for...

3. In a test of weight loss programs, 40 adults used the Atkins
weight loss program. After 12 months, their mean weight loss was
found to be 2.1 lb, with a standard deviation of 4.8 lb. Construct
a 90% confidence interval estimate of the standard deviation of the
weight loss for all such subjects. Does the confidence interval
give us information about the effectiveness of the diet?

Atkins Weight Loss Program: In a test of weight loss programs,
40 adults used the Atkins weight loss program. After 12 months,
their mean weight loss was found to be 2.1 lb, with a standard
deviation of 4.8 lb. Construct a 90% confidence interval estimate
of the mean weight loss for all such subjects. Does the Atkins
program appear to be effective? Does it appear to be practical?
Can this be constructed in XLSTAT? Where would you find the data...

The producer of a weight-loss pill advertises that people who
use the pill lose, after one week, an average (mean) of 1.85 pounds
with a standard deviation of 0.95 pounds. In a recent study, a
group of 60 people who used this pill were interviewed. The study
revealed that these people lost a mean of 1.73 pounds after one
week. If the producer's claim is correct, what is the probability
that the mean weight loss after one week on this...

A study was conducted to determine the effectiveness of a diet
program in reducing weight of obeys people. Eight randomly selected
patients were put on this diet and the amount of weight losses (in
pounds) were recorded. Suppose the sample mean and the sample
standard deviation of weight losses were 38 and 4.598136 pounds,
respectively. Construct a 90% confidence interval for the average
weight loss and based on the confidence interval constructed
determine if you would expect to see an...

A study was conducted to determine the effectiveness of a diet
program in reducing weight of obeys people. Eight randomly selected
patients were put on this diet and the amount of weight losses (in
pounds) were recorded. Suppose the sample mean and the sample
standard deviation of weight losses were 36 and 5.291503 pounds,
respectively. Construct a 90% confidence interval for the average
weight loss and based on the confidence interval constructed
determine if you would expect to see an...

The producer of a weight-loss pill advertises that people who
use the pill lose, after one week, an average (mean) of pounds with
a standard deviation of pounds. In a recent study, a group of
people who used this pill were interviewed. The study revealed that
these people lost a mean of pounds after one week. If the
producer's claim is correct, what is the probability that the mean
weight loss after one week on this pill for a random...

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