Question

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.

Answer #1

true or false
When the level of confidence and sample proportion p remain the
same, a confidence interval for a population proportion p based on
a sample of n = 200 will be narrower than a confidence interval for
p based on a sample of n = 100.
When the level of confidence and the sample size remain the
same, a confidence interval for a population mean µ will
be narrower, when the sample standard deviation s is larger than...

) 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)

Group
Mean x
Standard deviation s
Sample size n
Female
0.9
.9764
7
Male
6.9667
8.899
21
Consider the confidence interval 99% (lower, upper)
(-11.6634,-.47), and indicate whether each of the following
statements below is correct or incorrect interpretations of this
interval.
a. A 90% confidence interval calculated from the same data would
be wider than the interval already computed. (True or False)
b. There is a 99% chance that the true difference in RDI Levels
between men and women...

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

For a given set of values for x1, x2, . . . , xk the confidence
interval for the conditional mean of Y is
usually about the same as the prediction interval for the
individual Y value.
wider than the prediction interval for the individual Y
value.
narrower than the prediction interval for the individual
Y value.

1. A higher p-value corresponds to higher confidence in the
stated result. True or False?
2. The function "errorbar()" is used to calculate standard
errors of means (which are often used in plots with error bars).
True or False?
3. For a given data set, the 80% confidence interval for the
mean is going to be larger than the 90% confidence interval for the
mean. True or False?
4. For a given data set, the 90% confidence interval for the...

True or false?:
13) For a sample mean, the 99% confidence interval is wider than
the 95% confidence interval. 14) The larger the sample size the
more likely x̅ is close to μ.
15) Changing sample size has no effect on power when using the t
test.
16) For the independent two-sample t test, increasing sample
variances decreases power.

Which of the following statements is true?
The 95% confidence interval is wider than the 99% confidence
interval.
The ONLY way to reduce the width of a confidence interval is to
reduce the confidence level.
The required sample size for a population mean is ONLY
dependent on population variance.
Given population variance and sampling error, higher confidence
level results in larger sample size.

29. When the level of confidence and the sample size remain the
same, a confidence interval for a population mean µ will be _____,
when the sample standard deviation s is smaller than when s is
larger.
A. narrower
B. sometimes wider, sometimes narrower
C. wider
D. the same

use the information given to compute a confidence interval for
the population mean μ
x̅ = 102, s = 18, n = 81, 90% confidence
level
x̅ = 102, s = 18, n = 81, 99% confidence level

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