Question

Which of the following terms are included in a 95% confidence interval for the difference between two means found from a sample of 25 for each sample?

a. the mean

b. T value for the df of 49, at two tail .05

c.all of these are used

d. only a and c

Answer #1

TOPIC:Confidence interval for the difference between the population means.

Which of the following terms are included in a 95% confidence
interval for a mean found from a sample of 25? a. the mean b. T
value for a df of 24, at two tail .05 C. the standard error of the
mean D. all of these are used E. only a and b

Question 1.
Which of the following is the CORRECT interpretation of a 95%
confidence interval?
a) There is a 95% probability that the interval contains the
population value
b) There is a 95% chance that the true population value is
inside the interval
c) if we sampled from a population repeatedly and created
confidence intervals, 95% of those confidence intervals would
contain the population mean
d) We are 95% sure of the sample statistic
Question 2.
What is the mean...

You want to calculate a 95% confidence interval (CI) for the
difference between the means of two variables. The variables are
from populations with normal distributions and those distributions
have the same standard deviation (σ). To make your estimate you
will take the same number of samples from each population,
calculate the mean for each sample, calculate the difference
between those sample means, and then add or subtract the term that
defines the CI. If you want the width of...

Find a 95% confidence interval for the difference between the
two population means.

A. which confidence interval is wider? The 95%
confidence interval or the 99% confidence interval?
difference for both confidence intervals: 0.109
95% CI for difference: (-0.123, 0.340)
99% CI for difference: (-0.199, 0.416)
B. Given an arbitrary data set, is there a general
relationship between confidence level and the width of the
confidence interval? Explain.
Please make the answers to parts A and B detailed and easy to
read and follow, thank you :)

Q10. If population mean is included in the 95% confidence
interval then
a. 99% confidence interval will always include the mean
b. 90% confidence interval will never include that mean
c. 99% confidence interval will never include that mean
d. 90% confidence interval will always include the mean

I have an original data set and 4 sets of transformed data to
which I applied a two-sample pooled variance t-procedure in R. I am
uncertain about to how to interpret the confidence intervals of the
transformed data since when I back-transform the endpoints by
undoing the original operation, I get values that don't seem
anywhere near correct. Each of the transformations that was applied
has been added as a suffix to the vector name containing the
transformed data (in...

Calculate the 95% confidence interval for the difference
(mu1-mu2) of two population means given the following sampling
results. Population 1: sample size = 18, sample mean = 26.66,
sample standard deviation = 1.04. Population 2: sample size = 15,
sample mean = 10.79, sample standard deviation = 1.71.

Using SPSS, the outcome of the data analysis are as follow;
Paired Differences
95% Confidence Interval of the difference
Mean
Std. Deviation
Std. Error Mean
Lower
Upper
T
df
Sig.(2-tailed)
Pair 1
Method A-Method B
5.200
6.125
1.937
0.819
9.581
2.685
9
1-Provide a statement about the finding in this table for paired
t-test and it is interpretation?
2-Report the estimate difference for ua-ub
between the mean scores obtained by children taught by the two
methods and its 95% confidence...

Recall the method used to obtain a confidence interval for the
difference between two population means for matched samples.
(a) The following data are from matched samples taken from two
populations. Compute the difference value for each element. (Use
Population 1 − Population 2.)
Element
Population
Difference
1
2
1
11
8
2
7
8
3
9
6
4
12
7
5
13
10
6
15
15
7
15
14
(b) Compute d.
(c) Compute the standard
deviation sd. (Round
your answer...

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