Question

Construct a 95% confidence interval for u1 = u2. Two samples are randomly selected from normal populations. The sample statistics are given below. Assume that 021 = 022.

N1 = 8 n2 = 7

x1 = 4.1 x2 = 5.5

s1 = 0.76 s2 = 2.51

Answer #1

Construct a 90% confidence interval for u1 = u2. Two samples are
randomly selected from normal populations. The sample statistics
are given below. Assume that o21 = 022.
n1 = 10 n2 = 12
x1 = 25 x2 = 23
s1 = 1.5 s2 = 1.9

Construct a? 90% confidence interval for u1 - u2. Two samples
are randomly selected from normal populations. The sample
statistics are given below. Assume that 2?1= 2?2.
n1=?10, n2=?12, x overbar=?25, x overbar=?23, s1=?1.5,
s2=1.9

QUESTION 5 Construct a 95% confidence interval for μ 1 - μ 2.
Two samples are randomly selected from normal populations.
The sample statistics are given below. n 1 = 8 n 2 = 7 1 = 4.1 2
= 5.5 s 1 = 0.76 s 2 = 2.51 (-1.132, 1.543) (2.112, 2.113) (-1.679,
1.987) (-3.813, 1.013)

Chapter 6, Section 4-CI, Exercise 188:
A 95% confidence interval for U1 - U2 using the sample results
Xbar 1 = 80.7, S1=9.2, N1=35 and Xbar 2 = 63.0, S2=8.0, N2=20 .
Best estimate:
Margin of error (two decimal places):
Confidence Error (two decimal places):

The heights of randomly selected men and women were recorded.
The summary statistics are below. Construct a 90% confidence
interval for the difference between the mean height (in cm) of
women and the mean height of men. Assume that the two samples are
independent and that they have been randomly selected from normally
distributed populations. Do not assume that the population standard
deviations are equal. Women n1=10 x1=162.4cm s1= 11.8cm Men n2=10
x2=10 s2=5.3cm

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

Consider the data to the right from two independent samples.
Construct 95% confidence interval to estimate the difference in
population means. Click here to view page 1 of the standard normal
table. LOADING... Click here to view page 2 of the standard normal
table.
x1= 44
x2=50
σ1=10
σ2=15
n1= 32
n2 = 39 The confidence interval is what two numbers, . (Round
to two decimal places as needed)

4) Test the hypothesis that μ1 ≠ μ2. Two samples are randomly
selected from each population. The sample statistics are given
below. Use α = 0.02.
n1 = 51
x1=1
s1 = 0.76
n2 = 38
x2= 1.4
s2 = 0.51
STEP 1: Hypothesis: Ho:________________ vs H1:
________________
STEP 2: Restate the level of significance:
______________________
STEP 4: Find the p-value: ________________________ (from the
appropriate test on calc)
STEP 5: Conclusion:

Independent random samples were selected from two quantitative
populations, with sample sizes, means, and standard deviations
given below. n1 = n2 = 80, x1 = 125.3, x2 = 123.6, s1 = 5.7, s2 =
6.7
Construct a 95% confidence interval for the difference in the
population means (μ1 − μ2). (Round your answers to two decimal
places.)
Find a point estimate for the difference in the population
means.
Calculate the margin of error. (Round your answer to two decimal
places.)

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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