Question

1. Which of the following describes the correct correlation between Confidence Percent Level and Margin of Error ‘E’:

A. As the confidence percent level of my CI increases (from 90%
to 95% to 99%), the Margin of Error E decreases in value.

B. As the confidence percent level of my CI decreases (from 99% to
95% to 90%), the Margin of Error E increases in value.

C. As the confidence percent level of my CI increases (from 90% to 95% to 99%), the Margin of Error E also increases in value.

D. None

Answer #1

**We know that the formula of Margin of error is directly
proportional to the z-value of the problem; and thereby to the
Confidence percent level.**

**This is also true in the intuitive sense, that when we
want to be confident about our confidence interval, then the
interval would evidently be larger, and the Margin of Error would
also be larger.**

**So, this means that there is a positive correlation
between confidence percent level and margin of error.**

**So, this means that, if the confidence level increases,
then the margin of error must also increase.**

**This implies, the correct answer is option (C)**
**As the confidence percent level of my Confidence Interval
increases (from 90% to 95% to 99%), the Margin of Error E also
increases in value.**

Question 1.
Which of the following is the CORRECT interpretation of a 95%
confidence interval?
a) There is a 95% probability that the interval contains the
population value
b) There is a 95% chance that the true population value is
inside the interval
c) if we sampled from a population repeatedly and created
confidence intervals, 95% of those confidence intervals would
contain the population mean
d) We are 95% sure of the sample statistic
Question 2.
What is the mean...

Which of the following is correct for confidence interval?
As the sample size decreases, confidence interval gets
narrower.
As the confidence level increases, confidence interval gets
broader.
As the sample size increases, confidence interval gets
broader.
As the confidence level increases, confidence interval gets
narrower.

1- Which of the following statements is true?
I. For a certain confidence level, you get a higher margin of
error if you reduce your sample size.
II. For a given sample size, increasing the margin of error will
mean higher confidence.
III. For a fixed margin of error, smaller samples will mean
lower confidence.
I only
II only
III only
II and III only
All of them
----------------------------------
2- Which must be true about a 90% confidence interval based...

If n=440 and ˆpp^ (p-hat) =0.75, find the margin of error at a
99% confidence level.
As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval
--Use z = 2 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval.
Give your answer rounded to three decimal places.

Which of the following is true when a 95% confidence interval for a
population proportion is changed to a 99% confidence interval, with
all other parts of the interval remaining constant? Clear
Detailed Work Please! Thank you for your hard work!
One of these 4 options is correct:
A. interval size increases by 4%
B. interval size decreases by 4%
C. interval size increases by 31%
D. interval size decreases by 31%

1. When constructing a confidence interval to estimate a
population proportion, what affects the size of the margin of
error?
A. The sample size
B. The sample proportion
C. The confidence level
D. All of the above affect the size of the margin of error
E. None of the above affect the size of the margin of error
2. What percentage of couples meet through online dating
apps? A survey of a random sample of couples finds that 12% say...

which statement about coefficient alpha is correct?
A) when the measurement error increases, alpha increases.
b) when the correlation between items and the total score
decreases, alpha increases
C) when the correlation between items increases,alpha
increases
D) when a tests includes many similar items, alpha
decreases.

Use the sample data and confidence level given below to complete
parts (a) through (d). A research institute poll asked
respondents if they felt vulnerable to identity theft. In the
poll, n equals 1006 and x equals 554 who said "yes." Use a 99 %
confidence level.
a) Find the best point estimate of the population proportion
p.
b) Identify the value of the margin of error E.
c) Construct the confidence interval.
d) Write a statement that correctly interprets...

Which of the following is correct about the power of the test?
Check all that apply. a. As alpha increases, power decreases. b. As
standard error decreases, power increases. c. As Type I error
increases, power increases. d. As effect size increases, power
increases. e. As sample size increases, power increases. f. As
sample size increases, power is unaffected. g. As Type II error
decreases, power decreases.

Use the sample information x¯ = 35, σ = 7, n = 16 to calculate
the following confidence intervals for μ assuming the sample is
from a normal population. (a) 90 percent confidence. (Round your
answers to 4 decimal places.) The 90% confidence interval is from
to (b) 95 percent confidence. (Round your answers to 4 decimal
places.) The 95% confidence interval is from to (c) 99 percent
confidence. (Round your answers to 4 decimal places.) The 99%
confidence interval...

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