Question
Suppose you want to determine whether the average values for populations 1 and 2 are different,...
Suppose you want to determine whether the average values for populations 1 and 2 are different, and you
randomly gather the following data.
sample 1
2, 11, 7, 8, 2, 5, 9, 1, 9, 1, 5, 8, 11, 2, 5, 5, 6, 9
sample 2
10, 12, 8, 12, 9, 12, 9, 7, 9, 10, 11, 10, 11, 10, 7, 8, 10, 10
Test your conjecture, using a probability of committing a Type I error of .01. Assume the population
variances are the same and the x is normally distributed in the populations.
b. Use these data to construct a 98% confidence interval for the difference in the two population means.
Homework Answers
Answer #1
Not the answer you're looking for?
Similar Questions
Suppose you are statistically comparing the means of two populations with the following hypotheses: ?0: ?1...
Suppose you are statistically comparing the means of two
populations with the following hypotheses: ?0: ?1 ≤ ?2, ?1: ?1 >
?2. The sample sizes from the two populations are ?1 = 16 and ?2 =
13, and the variances of the two populations are assumed to be
unknown but equal. Find the bounds for the ?-values if using the
book, or the explicit ?-values if using Excel, for the following
test statistics associated with this problem. Draw conclusions with...
The table below presents three samples of data. Please conduct a test for the equality of...
The table below presents three samples of data. Please conduct a
test for the equality of the three population means with 90%
confidence.
Sample
1
Sample
2
Sample
3
7
11
6
5
8
5
7
11
4
6
7
5
6
13
14
6
13
5
6
12
5
6
11
6
8
8
8
9
7
6
7
6
14
9
7
4
8
8
8
8
9
13
9
6
10
8
11
14
8
9
14...
Given two independent random samples with the following results: n1=8x‾1=89s1=15n1=8x‾1=89s1=15 n2=8x‾2=126s2=20n2=8x‾2=126s2=20 Use this data to find...
Given two independent
random samples with the following results:
n1=8x‾1=89s1=15n1=8x‾1=89s1=15 n2=8x‾2=126s2=20n2=8x‾2=126s2=20
Use this data to find
the 98%98% 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.
Copy Data
Step 3 of 3 :
Construct the 98%98%
confidence interval. Round your answers to the nearest whole
number.
n1 13 n2 9 x1bar 141 x2bar 161 s1 13 s2 12 Use this data to...
n1 13 n2 9
x1bar 141 x2bar 161
s1 13 s2 12
Use this data to find the 98%98% 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.
Copy Data
Step 1 of 3:
Find the critical value that should be used in constructing the
confidence interval. Round your answer to three decimal places.
Step 2 of 3:
Find the standard error of the...
Consider the following data for two independent random samples taken from two normal populations. Sample 1...
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...
The following information was obtained from two independent samples selected from two normally distributed populations with...
The following information was obtained from two independent
samples selected from two normally distributed populations with
unknown but equal standard deviations. Sample 1 13 14 9 12 8 10 5
10 9 12 16 Sample 2,16,18,11,19,14,17,13,16,17,18,22,12.
a. Let μ 1 be the mean of population 1 and μ 2 be the mean of
population 2. What is the point estimate μ 1 − μ 2 ? Round your
answer to two decimal places. The point estimate μ 1 − μ...
- Pick a theme (topic) - Define two distinct populations and two independent samples, for example:...
- Pick a theme (topic)
- Define two distinct populations and two independent samples,
for example: Population 1: Male Students at DVC, Population 2:
Female Students at DVC. Two populations or samples are independent
if the values selected from one population are not related to or
somehow naturally paired or matched with the values selected from
the other population.
- Devise a sampling technique. A SRS is not expected but it
should be more than a mere convenience sample. Sampling...
11 . Choosing the appropriate test statistic You are interested in the difference between two population...
11 . Choosing the appropriate test statistic
You are interested in the difference between two population means.
Both populations are normally distributed, and the population
variances σ212 and σ222 are known. You use an independent samples
experiment to provide the data for your study. What is the
appropriate test statistic?
F = √[2/n1 + 2/n2]
F = s1/s2
z = (x̄1 – x̄2) / √[σ2/n1 + σ2/n2]
z = (p̂1 – p̂2) / √[p̂(1 – p̂)(1/n1 + 1/n2)]
Suppose instead...
Group 1 Group 2 9 7 10 6 11 8 12 9 8 11 7 10...
Group 1
Group 2
9
7
10
6
11
8
12
9
8
11
7
10
Please find the means, sum of squares, df, and standard error
for both groups. Thank you!!
2.) Assume that you have a sample of n1 = 8, with the sample mean X...
2.) Assume that you have a sample of n1 = 8, with the sample
mean X overbar 1= 42, and a sample standard deviation of S1 = 4,
and you have an independent sample of n2=15 from another population
with a sample mean of X overbear 2 = 34 and a sample standard
deviation of S2 = 5.
What assumptions about the two populations are necessary in
order to perform the pooled-variance t test for the hypothesis H0:
μ1=μ2 against...
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 4 minutes ago
asked 4 minutes ago
asked 5 minutes ago
asked 12 minutes ago
asked 15 minutes ago
asked 29 minutes ago
asked 40 minutes ago
asked 41 minutes ago
asked 49 minutes ago
asked 50 minutes ago
asked 53 minutes ago
asked 1 hour ago