Question

Given in the table are the BMI statistics for random samples of men and women. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.010.01 significance level for both parts. Male BMI Female BMI muμ mu 1μ1 mu 2μ2 n 4545 4545 x overbarx 28.274128.2741 25.171825.1718 s 7.4101397.410139 4.3731854.373185

Answer #1

t*= t0.005,88 =2.6329

with

Given in the table are the BMI statistics for
random samples of men and women. Assume that the two samples are
independent simple random samples selected from normally
distributed populations, and do not assume that the population
standard deviations are equal. Complete parts (a) and (b) below.
Use a 0.01 significance level for both parts.
Male BMI
Female BMI
μ
μ1
μ2
n
50
50
x̄
27.7419
26.4352
s
8.437128
5.693359
a) Test the claim that males and females have...

7. Given in the table are the BMI statistics for random samples
of men and women. Assume that the two samples are independent
simple random samples selected from normally distributed
populations, and do not assume that the population standard
deviations are equal. Complete parts (a) and (b) below. Use a
0.05 significance level for both parts.
Male BMI
Female BMI
µ
µ1
µ2
N
48
48
xˉ
27.6431
26.5609
s
7.105107
4.438441
The test statistic, t, is ____
(Round to...

Researchers conducted a study to determine whether
magnets are effective in treating back pain. The results are shown
in the table for the treatment (with magnets) group and the sham
(or placebo) group. The results are a measure of reduction in back
pain. Assume that the two samples are independent simple random
samples selected from normally distributed populations, and do not
assume that the population standard deviations are equal. Complete
parts (a) and(b) below. Use a 0.05significance level for both...

In Exercises 5–20, assume that the two samples are independent
simple random samples
selected from normally distributed populations, and do not assume
that the population standard
deviations are equal. (Note: Answers in Appendix D include
technology answers based
on Formula 9-1 along with “Table” answers based on Table A-3 with
df equal to the smaller
of n11 and n21.)
BMI We know that the mean weight of men is greater than the mean
weight of women, and the mean height...

The heights of randomly selected men and women were recorded.
The summary statistics are below. Construct a 90% confidence
interval for the difference between the mean height (in cm) of
women and the mean height of men. Assume that the two samples are
independent and that they have been randomly selected from normally
distributed populations. Do not assume that the population standard
deviations are equal. Women n1=10 x1=162.4cm s1= 11.8cm Men n2=10
x2=10 s2=5.3cm

Use the given statistics to complete parts (a) and (b). Assume
that the populations are normally distributed. (a) Test whether mu
1μ1greater than>mu 2μ2 at the alphaαequals=0.10 level of
significance for the given sample data. (b) Construct a 90%
confidence interval about mu μ1−μ2.
Population 1 Population 2
n 23
19
x 46.2
45.1
s 5.1
13.4
Find the test statistic for the hypothesis test

The body mass index (BMI) for a sample of men and a sample of
women are given below. Assume the samples are simple random samples
obtained from populations with normal distributions.
Men
23.8
22.3
32.9
27.4
27.5
31.7
25.9
23.3
22.1
25.7
Women
17.5
21.5
22.6
31.8
17.9
20.6
17.2
38.3
19.5
24.6
Construct a 99% confidence interval estimate of the standard
deviation of BMIs for men
_ < σ men < _
Construct a 99% confidence interval estimate of...

Perform the indicated hypothesis test. Assume that the
two samples are independent simple random samples selected from
normally distributed populations.
1) A researcher was interested in comparing the amount of time
spent watching television by women and by men. Independent simple
random samples of 14 women and 17 men were selected, and each
person was asked how many hours he or she had watched television
during the previous week. The summary statistic are as follows.
Women: xbar1= 12.2hr s1= 4.4...

Given below are the BMI statistics for random samples of males
and females.
Male BMI
n=40
x bar=28.44075
s=7.394076
Female BMI
n= 40
x bar= 26.6005
s=5.359442
note: x bar is the sample mean.
Type you answers in the box below.
a) Find Ho and H1
b) Find the p-value

Researchers conducted a study to determine whether magnets are
effective in treating back pain. The results are shown in the table
for the treatment (with magnets) group and the sham (or placebo)
group. The results are a measure of reduction in back pain. Assume
that the two samples are independent simple random samples selected
from normally distributed populations, and do not assume that the
population standard deviations are equal. Complete parts (a) and
(b) below. Use a 0.050.05 significance level...

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