Question

Describe a confidence interval for the difference in means
between two population by stating

1. a pair of populations composed of the same type of individuals
and a quantitative variable on those populations,

2. sizes and degrees of freedom of samples from those
populations,

3. the means of those samples, and

4. the standard deviations of those samples. Then state

5. a confidence level and find

6. find the interval. Finally, perform a test of significance
concerning the difference in the means of the populations by
stating

7. both a null and an alternative hypothesis and

8. an α-level, then finding 9. the two-sample t-statistic and
either

10. rejecting or failing to reject the null hypothesis. Remember
that you do not need to list the values of the variable for
individuals in either the sample or the population, and that the
values for 2, 3, 4, 5, and 8 do not need to be calculated, only
stated.

**Please provide answer with simple example**

Answer #1

Describe a situation where you would use ANOVA by stating
1. the quantity of populations that are to be investigated,
2. a quantitative variable on these populations,
3. the sizes of samples from these Populations,
4. your null hypothesis,
5. your alternative hypothesis, and
6. a significance level.
Then find 7. The degrees of freedom of the numerator of your
F-statistic, p
8. the degrees of freedom of the denominator of your
F-statistic, and state
9. what the P-value for...

1. Forum Description Describe a test of significance on the mean
of a population by stating 1. a population, 2. a quantitative
variable on that population, 3. the population standard deviation
of that variable (with units), 4. a null hypothesis, 5. an
alternative hypothesis, 6. an α-level, 7. a sample size, and 8. a
sample mean of that variable (with units). Find 9. the one-sample
z-statistic and either 10. reject or fail to reject the null
hypothesis. What does this...

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...

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...

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 =...

Suppose you calculate a 95% confidence interval for the
difference in population means. The confidence interval contains
both negative and positive values.
Will a 99% confidence interval based on the same data contain
both negative and positive numbers as well? Choose the correct
response from the options provided below.
Yes. Keeping all other values the same, increasing the
confidence level leads to a wider interval which would still
include negative and positive numbers.
No. Increasing the confidence level leads to...

Suppose you calculate a 95% confidence interval for the
difference in population means. The confidence interval contains
both negative and positive values.
Will a 99% confidence interval based on the same data contain
both negative and positive numbers as well? Choose the correct
response from the options provided below.
A. Yes. Keeping all other values the same, increasing the
confidence level leads to a wider interval which would still
include negative and positive numbers.
B.
No. Increasing the confidence level...

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...

In testing the difference between two population means using two
independent samples, the population standard deviations are assumed
to be unknown, each sample size is 30, and the calculated test
statistic z = 2.56. If the test is a two-tailed and the 5% level of
significance has been specified, the conclusion should be:
a.
none of these answers is correct.
b.
choose two other independent samples.
c.
reject the null hypothesis.
d.
not to reject the null hypothesis.

Shea wants to estimate the difference between two population
means and plans to use data collected from two independent simple
random samples of sizes ?1=27 and ?2=32. She does not know the
population standard deviations, so she plans to construct a
two-sample ?-confidence interval for the difference in the two
means.
Use a ?‑distribution table to determine the positive ?‑critical
value needed to construct a 95% confidence interval using a
conservative estimate of the number of degrees of freedom.
Enter...

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