Question

Based on a sample of size 49, a 95% confidence interval for the
mean score of all

students, μ, on an aptitude test is from 59.2 to 64.8.

Find the margin of error.

Group of answer choices

A) 2.8

B) 0.05

C) 0.78

D) There is not enough information to find the margin of error.

E) 5.6

Answer #1

A group of 51 randomly selected students have a mean score of
29.5 with a sample standard deviation of 5.2 on a placement test.
What is the 95% confidence interval for the
mean score, μ, of all students taking the test?
Critical error=
Margin of error=
confidence interval=

For a random sample sample of size 12, one has calculated the
95% confidence interval for μ and obtained the result (46.2,
56.9).
a) What is the margin of error for this confidence
interval?
b) What is the point estimate for that sample?
c) Find the standard deviation (s) for that sample.

(a)
Construct a 95% confidence interval about
Mu μ if the sample size, n, is 34
Lower bound:
___________
; Upper bound:
______________
(Use ascending order. Round to two decimal places as
needed.)
(b) Construct a 95% confidence interval about mu μ if
the sample size, n, is 51.
Lower bound:
____________
; Upper bound:
____________
(Use ascending order. Round to two decimal places as
needed.)
How does increasing the sample size affect the margin
of error, E?
A.
The...

Find the margin of error for a 95% confidence interval for
estimating the population mean when the sample standard deviation
equals 90 with a sample size of (i) 484 and (ii) 1600
(i) Find the margin of error for a 95% confidence interval for
estimating the population mean when the sample standard deviation
equals 90 with a sample size of 484
(ii).
(ii) Find the margin of error for a 95% confidence interval
for estimating the population mean when the...

A
95%
confidence interval of
16.6
months to
49.6
months has been found for the mean duration of
imprisonment,
muμ,
of political prisoners of a certain country with chronic
PTSD.
a. Determine the margin of error, E.
b. Explain the meaning of E in this context in terms of the
accuracy of the estimate.
c. Find the sample size required to have a margin of error
of
12
months and a
99%
confidence level. (Use
sigmaσequals=42
months.)d. Find a
99%...

#1 Use the confidence level and sample data to find a confidence
interval for estimating the population μ. Find the margin of error
E and round your answer to the nearest tenth. Test scores: n = 93,
LaTeX: \bar{x}x ¯ = 88.5, σ = 6; 99% confidence
#2 A sociologist develops a test to measure attitudes towards
public transportation, and n = 82 randomly selected subjects are
given the test. Their mean score is LaTeX: \bar{x}x ¯ = 75.9 and...

sample of size 36, the 95% confidence interval for the
population mean is 64.90, 69.30. The sample mean is:
66.04
None of the choices is correct.
67.10
63.10

Suppose a 90% confidence interval, based upon a sample of size
35, for the mean number of hours that college students spend on
social media each week was 25 to 35 hours. The sample standard
deviation from this previous study was 17.9. How many students
should be surveyed in order to cut the width of the interval down
from 10 hours to 5 hours? Group of answer choices A.100 B.300 C.250
D.139

The 95% confidence interval for the mean is [50.5,56.5] with
data from a normal distribution with known standard deviation. How
a hypothesis test is run at alpha = 0.05 using H0: mu = 49 against
H1: mu != 49. Find the test statistic value z for the test.

A 95% confidence interval for the mean trading
achievement score for a population of third grade students is
(44.2, 54 2). Suppose you compute a 99% confidence interval using
the same information. Which of the following statements are
correct?
The intervals have the same width
The 99 percent interval is shorter
The 99 percent interval is longer
Answer can't be determined
None of the above

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