Question

Use the *t*-distribution to find a confidence interval
for a difference in means μ1-μ2 given the relevant sample results.
Give the best estimate for μ1-μ2, the margin of error, and the
confidence interval. Assume the results come from random samples
from populations that are approximately normally distributed.

A 90% confidence interval for μ1-μ2 using the sample results
x¯1=81.1, s1=10.3, n1=35 and x¯2=67.1, s2=7.9, n2=20

Enter the exact answer for the best estimate and round your answers
for the margin of error and the confidence interval to two decimal
places.

Answer #1

= 81.1, s1 = 10.3, n1 = 35

= 67.1, s2 = 7.9, n2 = 20

c = 90% , = 0.10

1)

Best point estimate =
= 81.1 - 67.1 = 14

**Best point estimate =
14**

2)

formula for margin of error is

where,

df = n1 + n2 - 2 = 35 + 20 2 = 53

1.674

Sp = 9.509528

= 4.462176451

**Margin of error =
4.46**

14 - 4.462176451 , 14 + 4.462176451

**Confidence interval = (
9.54 , 18.46 )**

Use a t-distribution to find a confidence interval for the
difference in means μd=μ1-μ2 using the relevant sample results from
paired data. Assume the results come from random samples from
populations that are approximately normally distributed, and that
differences are computed using d=x1-x2.
A 95% confidence interval for μd using the paired data in the
following table:
Case
Situation 1
Situation 2
1
77
87
2
81
86
3
95
91
4
61
79
5
71
77
6
72
62...

Chapter 6, Section 4-CI, Exercise 191
Use the t-distribution to find a confidence interval for a
difference in means μ1- μ 2 given the relevant sample results. Give
the best estimate for μ1- μ 2, the margin of error, and the
confidence interval. Assume the results come from random samples
from populations that are approximately normally distributed.
A 90% confidence interval for μ1- μ 2 using the sample results
X̄1=5.4 ,s1=3.0, n1 = 11.
And X̄2=4.3 ,s2= 3.1, n2= 8...

Use the normal distribution to find a confidence
interval for a difference in proportions
p1-p2
given the relevant sample results. Assume the results
come from random samples.
A 99% confidence interval for
p1-p2
given that
p^1=0.76
with
n1=590
and
p^2=0.65
with
n2=340
Give the best estimate for
p1-p2
, the margin of error, and the confidence
interval.
Round your answer for the best estimate to two decimal
places and round your answers for the margin of error and the
confidence...

Use the normal distribution to find a confidence interval for a
difference in proportions p1-p2 given the relevant sample results.
Assume the results come from random samples.
A 90% confidence interval for p1-p2 given thatp^1=0.25 with
n1=40 and p^2=0.35 with n2=120
Give the best estimate for p1-p2, the margin of error, and the
confidence interval.
Round your answer for the best estimate to two decimal places and
round your answers for the margin of error and the confidence
interval to...

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 90% confidence interval for μ using the sample results x¯=144.2,
s=55.7, and n=50
Round your answer for the point estimate to one decimal place, and
your answers for the margin of...

Use the t-distribution to find a confidence interval for a mean
μ given the relevant sample results. Give the best point estimate
for μ, the margin of error, and the confidence interval. Assume the
results come from a random sample from a population that is
approximately normally distributed.
A 90% confidence interval for μ using the sample results x¯=142.0,
s=52.8, and n=50
Round your answer for the point estimate to one decimal place, and
your answers for the margin of...

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 90% confidence interval for μ using the sample results x¯=3.5,
s=0.4, and n=100
Round your answer for the point estimate to one decimal place, and
your answers for the margin of...

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 95% confidence interval for μ using the sample results x̄ = 79.7,
s = 6.6, and n=42
Round your answer for the point estimate to one decimal place, and
your answers...

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 95% confidence interval for μ using the sample results x̄ = 79.7,
s = 6.6, and n = 42
Round your answer for the point estimate to one decimal place, and...

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 95% confidence interval for μ using the sample results
x̅=10.4, s=5.3, and n=30.
Round your answer for the point estimate to one decimal place,
and your answers for the margin of...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 7 minutes ago

asked 7 minutes ago

asked 8 minutes ago

asked 10 minutes ago

asked 13 minutes ago

asked 14 minutes ago

asked 14 minutes ago

asked 14 minutes ago

asked 14 minutes ago

asked 16 minutes ago

asked 18 minutes ago