Question

Suppose you take two random samples of dieters to show that
those on a Low-Carb Diet lose more weight than those on a Low-Fat
Diet. Use the following table to test the hypothesis H_{0}:
µ_{1} ≤ µ_{2} versus H_{1}: µ_{1}
> µ_{2} at 0.10 level of significance (Assume that the
population variances are equal but unknown). Which of the following
statements is true?

weight loss(in pounds) , low carb diet group 1 , low fat diet group 2

mean , 9.7 , 8.3

variance , 3.0 , 3.4

observations , 30 , 30

pooled variance , 3.2

df

t stat

p(t<=t) two-tail , 0.0024

Select one:

The appropriate p-value for the test is 0.0012.

None of these are correct.

The critical values for the test are ±1.671.

All of these are correct.

There is no evidence that the average weight loss for those on the Low-Carb Diet is more than those on the Low-fat Diet.

Answer #1

Suppose you take two random samples of dieters to show that
those on a Low-Carb Diet lose more weight than those on a Low-Fat
Diet. Use the following table to test the hypothesis H0:
µ1 ≤ µ2 versus H1: µ1
> µ2 at 0.05 level of significance (Assume that the
population variances are equal but unknown). What is the
pooled-variance?
weight loss(in pounds)
low carb diet group 1, low fat diet group 2
mean 9.70
8.30
variance 3.55
...

According to a study published in the New England Journal of
Medicine, overweight people on low-carbohydrate and
Mediterranean diets lost more weight and got greater cardiovascular
benefits than people on a conventional low-fat diet (The Boston
Globe, July 17, 2008). A nutritionist wishes to verify these
results and documents the weight loss (in pounds) of 30 dieters on
the low-carbohydrate and Mediterranean diets and 30 dieters on the
low-fat diet. Let Low-carb or Mediterranean and Low-fat diets
represent populations 1...

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...

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...

The following independent samples show the delivery times for
two suppliers of raw materials (in days). A company
currently uses Supplier A but will switch to Supplier B if its
average delivery time is less than that for Supplier A. (1
point)
Supplier A
Supplier B
10
12
13
13
12
14
14
10
14
8
12
8
10
12
3
6
15
4
7
6
2
4
18
16
20
18
9
4
5
8
t-Test: Two-Sample Assuming Unequal
Variances...

A cohort study is conducted to assess the effectiveness of a
4-week weight-loss intervention program among overweight men. Sixty
participants were randomized into two groups. Group 1 worked with a
personal trainer to come up with a physical activity regimen that
would best fit their lifestyle, while Group 2 worked with a
dietician to co-design a diet program to which the men would most
likely adhere. Mean BMI was assessed for each group at the end of
the 4 weeks....

1. For a pair of sample x- and y-values, what is the difference
between the observed value of y and the predicted value of y? a) An
outlier b) The explanatory variable c) A residual d) The response
variable
2. Which of the following statements is false:
a) The correlation coefficient is unitless. b) A correlation
coefficient of 0.62 suggests a stronger correlation than a
correlation coefficient of -0.82. c) The correlation coefficient,
r, is always between -1 and 1....

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 7 minutes ago

asked 7 minutes ago

asked 15 minutes ago

asked 41 minutes ago

asked 54 minutes ago

asked 58 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago