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rovided below are summary statistics for independent simple random samples from two populations. Use the pooled...
rovided below are summary statistics for independent simple random samples from two populations. Use the pooled t-test and the pooled t-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval. X1=20, S1=6, N1=21, X2=22, S2=7, N2= 15 Left tailed test, a=.05 90% confidence interval The 90% confidence interval is from ____ to ____
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Provided below are summary statistics for independent simple random samples from two populations. Use the pooled...
Provided below are summary statistics for independent simple
random samples from two populations. Use the pooled t-test and the
pooled t-interval procedure to conduct the required hypothesis
test and obtain the specified confidence interval.
x1= 19, s1= 3, n1= 12, x2= 15, s2= 2, n2=13
a. What are the correct hypotheses for a left-tailed test?
b. Compute the test statistic.
c. Determine the P-value.
d. The 90% confidence interval is from _____ to _______ ?
Summary statistics are given for independent simple random samples from two populations. Use the pooled t-interval...
Summary statistics are given for independent simple
random samples from two populations. Use the pooled t-interval
procedure to obtain the specified confidence
interval.
X1 = 72.3, s 1 = 10.1, n
1 = 16, X2 = 69.9, s 2
= 8.7, n 2 = 12
Determine a 90% confidence interval.
a
-3.81 to 8.61
b
-4.46 to 9.26
c
-1.60 to 6.40
d
-2.39 to 7.19
Summary statistics are given for independent simple random samples from two populations. Use the nonpooled t-test...
Summary statistics are given for independent simple random
samples from two populations. Use the nonpooled t-test to conduct
the required hypothesis test.
x1 = 12.5, SJ = 3.9, n1 = 14, x2 = 13.5, s2 = 5.2, n2 = 17 20)
--- Perform a left-tailed hypothesis test using a significance
level of a = 0.05.
A) Test statistic: t = -0.611 Critical value = - 1.701Do not
reject Ho
B) Test statistic: t = -2.211 Critical value= -1.699 Reject
Ho...
Provided below are summary statistics for independent simple random samples from two populations. Use the pooled...
Provided below are summary statistics for independent simple
random samples from two populations. Use the pooled t-test and the
pooled t-interval procedure to conduct the required hypothesis
test and obtain the specified confidence interval.
x overbar 1x1equals=1414,
s 1s1equals=2.42.4,
n 1n1equals=1818,
x overbar 2x2equals=1515,
s 2s2equals=2.42.4,
n 2n2equals=1818
a. Two-tailed test,
alphaαequals=0.050.05
b.
9595%
confidence interval
a. First, what are the correct hypotheses for
a two-tailed test?
A.
Upper H 0H0:
mu 1μ1equals=mu 2μ2
Upper H Subscript aHa:
mu 1μ1not...
The numbers of successes and the sample sizes for independent simple random samples from two populations...
The numbers of successes and the sample sizes for independent
simple random samples from two populations are x1=15, n1=30, x2=59,
n2=70. Use the two-proportions plus-four z-interval procedure to
find an 80% confidence interval for the difference between the two
populations proportions. What is the 80% plus-four confidence
interval?
Two random samples are selected from two independent populations. A summary of the samples sizes, sample...
Two random samples are selected from two independent
populations. A summary of the samples sizes, sample means, and
sample standard deviations is given below:
n1=41, n2=44, x¯1=52.3, x¯2=77.3, s1=6 s2=10.8
Find a 96.5% confidence interval for the difference μ1−μ2 of the
means, assuming equal population variances.
Confidence Interval =
Two random samples are selected from two independent populations. A summary of the samples sizes, sample...
Two random samples are selected from two independent
populations. A summary of the samples sizes, sample means, and
sample standard deviations is given below:
n1=51,n2=36,x¯1=56.5,x¯2=75.3,s1=5.3s2=10.7n1=51,x¯1=56.5,s1=5.3n2=36,x¯2=75.3,s2=10.7
Find a 97.5% confidence interval for the difference μ1−μ2μ1−μ2
of the means, assuming equal population variances.
Confidence Interval =
Independent random samples are selected from two populations. The summary statistics are given below. Assume unequal...
Independent random samples are selected from two populations.
The summary statistics are given below. Assume unequal variances
for the questions below. m = 5 x ̅ = 12.7 s1 = 3.2
n = 7 y ̅ = 9.9 s2 = 2.1
a) Construct a 95% confidence interval for the difference of the
means.
b) Using alpha = 0.05, test if the means of the two populations
are different based on the result from part (a). Explain your
answer.
1. Two independent samples are taken from two distinct populations whichproduce sample means, standard deviations as ̄x1=...
1. Two independent samples are taken from two
distinct populations whichproduce sample means, standard deviations
as ̄x1= 104.6, ̄x2= 92.9,s1= 4.8,s2= 6.9,n1= 26,n2= 19.If we use
min(n1−1,n2−1) as the d.f., what t critical value would you usein
constructing a 90% confidence interval
forμ1−μ2?a). 2.101; b) 1.734; c) 1.708; d) 1.645
The following results are for independent random samples taken from two populations. Sample 1 Sample 2...
The following results are for independent random samples taken
from two populations.
Sample 1
Sample 2
n1 = 40
n2 = 50
x1 = 32.2
x2 = 30.1
s1 = 2.6
s2 = 4.3
(a) What is the point estimate of the difference between the two
population means?
(b) What is the degrees of freedom for the t
distribution?
(c) At 95% confidence, what is the margin of error?
(d) What is the 95% confidence interval for the difference
between...
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