Question

Test for difference in means if two dependent samples are taken
from a normal

population gave the values:

Sample 1: 23, 26, 27, 29, 31, 33

Sample 2: 25, 25, 25, 26, 30, 35

Answer #1

Given the two dependent random samples with the following rests,
find the margin of error for a 95% confidence interval. Round 2
decimal place.
Population 1: 27 26 46 31 47 25 35
Population 2: 30 19 33 36 40 16 30

Construct a 90% confidence interval estimate for the difference
between two population means given the following sample data
selected from two normally distributed populations with equal
variances:
Sample 1 Sample 2
29
25 31
42 39
38
35
35 37
42 40
43
21
29
34
46 39
35

Two samples are taken with the following sample means, sizes,
and standard deviations
x¯1 = 30 x¯2 = 33
n1 = 48 n2 = 45
s1 = 4 s2 = 3
Estimate the difference in population means using a 88% confidence
level. Use a calculator, and do NOT pool the sample variances.
Round answers to the nearest hundredth.
_____< μ1−μ2 < ______

Construct a 90% confidence interval estimate for the difference
between two population means given the following sample data
selected from two normally distributed populations with equal
variances: Use SPSS
Sample
1
Sample 2
29
25 31
42 39
38
35 35
37
42 40
43
21
29
34
46
39

consider the following results frmo two independent random
samples taken from two populations. assume that the variances are
NOT equal.
Population 1
population 2
sample size
50
50
sample mean
35
30
sample variance
784
100
a) what is the "degrees of freedom" for these data?
b) what is the 95% confidence interval difference of the
population means?

Consider the following data for two independent random samples
taken from two normal populations.
Sample 1
10
7
13
7
9
8
Sample 2
8
7
8
4
6
9
(a)Compute the two sample means.
Sample 1:
Sample 2:
(b)Compute the two sample standard deviations. (Round your
answers to two decimal places.)
Sample 1:
Sample 2:
(c) What is the point estimate of the difference between the two
population means? (Use Sample 1 − Sample 2.)
(d) What is the...

Two samples are taken with the following sample means, sizes,
and standard deviations
x 1 = 36 x 2 = 23
n 1 = 61 n 2 = 68
s 1 = 2 s 2 = 5
Estimate the difference in population means using a 91%
confidence level. Use a calculator, and do NOT pool the sample
variances. Round answers to the nearest hundredth.
_______< μ1-μ2 <________

Given two dependent random samples with the following
results:
Population 1
19
26
26
30
48
33
31
Population 2
24
38
40
38
39
41
29
Use this data to find the 98% confidence interval for the true
difference between the population means.
Let d=(Population 1 entry)−(Population 2 entry)d=(Population 1
entry)−(Population 2 entry). Assume that both populations are
normally distributed.
Step 1 of 4 : Find the mean of the paired
differences, x‾d. Round your answer to one decimal place....

The Columbus Dispatch conducted a study. Two identical football,
one filled with helium and one filled with ordinary air, were used.
A casual observer was unable to detect a difference in the two
footballs. A novice kicker was used to punt the footballs. A trial
consisted of kicking both footballs in a random order. The kicker
did not know which football he was kicking. The distance of each
punt was recorded, then another trial was conducted. A total of 39...

Independent simple random samples are taken to test the
difference between the means of two populations whose
variances are not known. Given the sample sizes
are n1 = 11 and n2 = 16; and the sample
variances are S12 = 33 and
S22 = 64, what is the correct distribution to
use for performing the test?
A.
t distribution with 49 degrees of freedom
B.
t distribution with 59 degrees of freedom
C.
t distribution with 24 degrees of freedom...

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