Question

A study was done on proctored and nonproctored tests. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributedpopulations, and do not assume that the population standard deviations are equal. Use a 0.05 significance level for both parts. Proctored: n = 33, x bar = 77.98, s = 10.44 Nonproctored: n = 31, x bar = 81.95, s = 20.69 |

a. The test statistic, t, is ___? (Round to two decimal places as needed.)

b. The P-value is ___? (Round to three decimal places as needed.)

c. Construct a confidence interval suitable for testing the claim that students taking nonproctored tests get a higher mean score than those taking proctored tests.

___ < μ1 − μ2 < ___ (Round to two decimal places as needed.)

d. Does the confidence interval support the conclusion of the test?

(Yes/No), because the confidence interval contains (only positive values/only negative values/zero).

Answer #1

A study was done on prot and non-pro tests. The results are
shown in the table. 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
significance level 0.01 for both parts.
___________________________________________________________________
Pro Non-pro
μ μ1 μ2
n 34 32
x 74.86 83.25
s 10.51 18.27
_______________________________________________...

A study was done using a treatment group and a placebo group.
The results are shown in the table. 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.
Treatment
Placebo
u
u1
u2
n
34
30
x
2.34
2.62
s
0.58
0.95
1. The test statistic is _____ (round...

A study was done using a treatment group and a placebo group. The
results are shown in the table. 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
0.10
significance level for both parts.
Treatment
Placebo
mu
mu 1
mu 2
n
29
40
x overbar
2.34
2.69
s
0.82
0.52
a. Test the claim...

3. A study done on body temperatures of men and women. The
results are shown below: 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. Use a 0.05 significance level To
test the claim that men have a higher mean body temperature than
women. μ1 n1 = 11 X1 = 97.57 S1 = 0.78 degree F degree F μ2 n2 = 59
X2...

A study was done using a treatment group and a placebo group.
The results are shown in the table. 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.
Treatment
Placebo
μ
μ 1
μ 2
n
26
30
x̅
2.34
2.61
s
0.96
0.66
Test the claim that the...

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.
treatment
sham
m
m1
m2...

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...

A study was done using a treatment group and a placebo group.
The results are shown in the table. 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.
treatment, u1, n=25, x=2.35, s=.52
Placebo, u2, n=39, x=2.68, s=.92
Test statistic, t, is=
P value=
?<u1-u2<?
Reject?

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...

A study was done on skull sizes of humans during different time
periods. The results are shown in the table. 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.
4000 B.C.
A.D. 150
muμ
mu 1μ1
mu 2μ2
n
3030
3030
x overbarx
132.01132.01
mm
135.49135.49
mm
s
5.035.03
mm
5.275.27
mm
a. Use a
0.010.01
significance...

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