Question

Give a 95% confidence interval, for μ 1 − μ 2 given the following information. n 1 = 20 , X-Bar 1 = 2.82 , s 1 = 0.42 n 2 = 40 , X-Bar 2 = 2.95 , s 2 = 0.67 Rounded both solutions to 2 decimal places.

Answer #1

Give a 95% confidence interval, for μ 1 − μ 2 given the
following information.
n 1 = 30 , ¯ x 1 = 2.79 , s 1 = 0.91
n 2 = 35 , ¯ x 2 = 2.62 , s 2 = 0.68
____±____ Use Technology Rounded to 2 decimal places.
How do I solve this using technlology?

Give a 90% confidence interval, for μ 1 − μ 2 given the
following information. n 1 = 30 , ¯ x 1 = 2.38 , s 1 = 0.58 n 2 =
40 , ¯ x 2 = 2.87 , s 2 = 0.91 ±

4. Construct the confidence interval for μ 1 − μ 2 for the level
of confidence and the data from independent samples given. 99.5%
confidence: n 1 = 40, x - 1 = 85.6, s 1 = 2.8 n 2 = 20, x - 2 =
73.1, s 2 = 2.1 99.9% confidence: n 1 = 25, x - 1 = 215, s 1 = 7 n
2 = 35, x - 2 = 185, s 2 = 12

3. Construct a 98% confidence interval estimate for the mean
μ using the given sample information. (Give your answers
correct to two decimal places.)
n = 26, x = 18, and s = 2.7

If n=28,
x¯(x-bar)=36,
and s=16, construct a confidence interval at a 95% confidence
level. Assume the data came from a normally distributed
population.
Give your answers to one decimal place.
__________ <
μ
< ________________

If n=28,
x¯(x-bar)=36,
and s=16, construct a confidence interval at a 95% confidence
level. Assume the data came from a normally distributed
population.
Give your answers to one decimal place.
__________ <
μ
< ________________

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)

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 x¯=94.5,
s=8.5, and n=42
Round your answer for the point estimate to one decimal place, and
your answers for the margin of...

1. If n=19, ¯xx¯(x-bar)=34, and s=12, construct a confidence
interval at a 95% confidence level. Assume the data came from a
normally distributed population.
Give your answers to one decimal place.
2. In a survey, 11 people were asked how much they spent on
their child's last birthday gift. The results were roughly
bell-shaped with a mean of $50 and standard deviation of $15.
Construct a confidence interval at a 90% confidence level.
Give your answers to one decimal place....

Construct the confidence interval for the population mean μ.
c=0.95, x= 9.5,σ=0.8,and n=44
A 95% confidence interval form μ is(_,_) (Round to two decimal
places as needed.)

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