Question

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

Answer #1

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 data from two independent samples with
equal population variances. Construct a 90% confidence interval to
estimate the difference in population means. Assume the population
variances are equal and that the populations are normally
distributed.
x1 = 37.1
x2 = 32.2
s1 = 8.9
s2 = 9.1
n1 = 15
n2 = 16

Construct the indicated confidence interval for the difference
between the two population means. Assume that the two samples are
independent simple random samples selected from normally
distributed populations. Do not assume that the population standard
deviations are equal.
Two types of flares are tested and their burning times are
recorded. The summary statistics are given below.
Brand X
Brand Y
n = 35
n = 35
x-bar = 19.4 min
x-bar = 15.1 min
s = 1.4 min
s =...

Construct the indicated confidence interval for the difference
between the two population means. Assume that the two samples are
independent simple random samples selected from normally
distributed populations. Do not assume that the population standard
deviations are equal. A paint manufacturer wished to compare the
drying times of two different types of paint. Independent simple
random samples of 11 cans of type A and 9 cans of type B were
selected and applied to similar surfaces. The drying times, in...

Create and interpret the confidence interval at 90%,for the
population mean with the following data: Mintab can be used if
easier.
Age
31
29
38
35
29
36
43
30
27
36
33
42
43
32
63
45
37
37
42
35
54
36
30
26
41
27
36
27
33
36
37
36
30
30
31
36

In constructing a confidence interval estimate for the
difference between two population proportions, we: A. never pool
the population proportions B. pool the population proportions when
the populations are normally distributed C. pool the population
proportions when they are equal D. pool the population proportions
when the population means are equal The ratio of two independent
chi-squared variables divided by their degrees of freedom is: A.
normally distributed B. Student t-distributed C. F-distributed D.
chi-squared distributed

Use the t-distribution to find a confidence interval
for a difference in means μ1-μ2 given the relevant sample results.
Give the best estimate for μ1-μ2, the margin of error, and the
confidence interval. Assume the results come from random samples
from populations that are approximately normally distributed.
A 90% confidence interval for μ1-μ2 using the sample results
x¯1=81.1, s1=10.3, n1=35 and x¯2=67.1, s2=7.9, n2=20
Enter the exact answer for the best estimate and round your answers
for the margin of...

Confidence Interval for 2-Means (2 Sample T-Interval)
Given two independent random samples with the following
results:
n1=11
n2=17
x1¯=118
x2¯=155
s1=18
s2=13
Use this data to find the 99% confidence interval for the true
difference between the population means. Assume that the population
variances are equal and that the two populations are normally
distributed. Round values to 2 decimal places.
Lower and Upper endpoint?

Consider the following data from two independent samples with
equal population variances. Construct a 98% confidence interval to
estimate the difference in population means. Assume the population
variances are equal and that the populations are normally
distributed.
x1=37.9 x2=32.9
s1=8.7 s2=9.2
n1=15 n2=16
Click here to see the t-distribution table page 1, Click here to
see the t-distribution table, page 2
The 98% confidence interval is what two numbers. (Round to
two decimal places as needed.)

Find the 95% confidence interval for the difference between two
means based on this information about two samples. Assume
independent samples from normal populations. (Use conservative
degrees of freedom.) (Give your answers correct to two decimal
places.)
Sample
Number
Mean
Std. Dev.
1
21
34
29
2
25
23
27
Lower Limit
Upper Limit

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 28 minutes ago

asked 30 minutes ago

asked 31 minutes ago

asked 49 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago