Question

) Given the values *x,*
S, and n, form a 99%
confidence interval for σᶻ

*x* =15.1, s = 4.3, n = 24

A) 2.38, 9.7)

B) (10.04, 47.92)

C) (9.63, 45.92)

D) (10.21, 41.71)

Answer #1

determine the 99% confidence interval estimate for the
population of a noaml distributed given
n= 81 s(d)= 104 x= 1,200
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Is this TRUE or FALSE: Given the same values for n, xbar and s,
a confidence interval with a 90% level of confidence will be wider
than a confidence interval with a 99 level of confidence.

Construct the confidence interval for the population
standard deviation for the given values. Round your answers to one
decimal place.
n=20n=20, s=4.3s=4.3, and c=0.99

Construct a 99% confidence interval of the population proportion
using the given information.
x=75, n=150
The lower bound is?
The upper bound is?
99% confidence has an area of each tail, alpha/2 is .005, and
critical value is 2.575 (z alpha/2)

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 ±

Find the margin of error for the given confidence level and
values of x and n. x = 80, n = 146, confidence level 99%

Choose:
1. Compute a 99% confidence interval for mu if x-bar = 16.3, s =
1.5, and n = 25.
a.
16.3+/-0.8391
b.
16.3+/-0.774
c.
16.3+/-0.8361
d. 16.3+/-0.16782 e. not
given
2. Assume Ho: mu </= 80 with s = 10, n = 50, and x-bar = 83.
Find the p-value.
a.
1.414
b.
0.483
c.
0.017
d.
2.12
e. not given
3. A company claims a mean battery life of 42 months. A sample
of 36 yields a mean...

x= 53 n=217 sigma o= 7 confidence =99%
The confidence interval is from to
b. Obtain the margin of error by taking half the length of the
confidence interval.
What is the length of the confidence interval?
c. Obtain the margin of error by using the formula E=z(a/2) x o/
square root of n
Identify the critical value.
What is the margin of error obtained using the methods of parts
(b) and (c)?

Construct a confidence interval for p1−p2 at the given level of
confidence. x 1=399 n 1 =522 x 2 =413 n 2 =583 99% confidence

Construct a confidence interval of the population proportion at
the given level of confidence.
x=160, n=200, 99% confidence
The lower bound is:
The upper bound is:

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