Question
In: Statistics and Probability
Find the critical value needed to construct a 90% CI of a population mean µ...
- Find the critical value needed to construct a 90% CI of a population mean µ with a known standard deviation and sample size of 3
A) t/2 = 1.691 B) t/2 = 1.694 C) t/2 = 1.307 D) z/2 = 1.645
- Find the critical value needed to construct a 90% CI of a population mean µ with unknown standard deviation and sample size of 35.
A) t/2 = 1.691 B) t/2 = 1.694 C) t/2 = 1.307 D) z/2 = 1.645
- Find the ??2 critical values needed to estimate a population standard deviation with sample size 25 and 90% confidence level.
A) 36.415 B) 13.848 C) 15.659 D) 33.196
- Find the ??2 critical values needed to estimate a population standard deviation with sample size 25 and 90% confidence level.
A) 36.415 B) 13.848 C) 15.659 D) 33.196
- Construct a 90% confidence interval for estimating a population standard deviation with sample size 25 and ?2 = 8.2
A) 2.43 < < 3.55 B)6.66 < < 10.79 C) 2.32 < < 3.78 D) 6.97 < < 10.15
Solutions
orchestra answered 1 year agoRelated Solutions
Find the critical value t/α2 needed to construct a confidence interval of the given level with...
Find the critical value
t/α2
needed to construct a confidence interval of the given level
with the given sample size. Round the answers to three decimal
places.
(a) For level
99%
and sample size
9
(b) For level
99.5%
and sample size
14
(c) For level
80%
and sample size
29
(d) For level
90%
and sample size
11
Assuming that the population is normally distributed, construct a 90% confidence interval for the population mean...
Assuming that the population is normally distributed, construct
a 90% confidence interval for the population mean for each of the
samples below. Explain why these two samples produce different
confidence intervals even though they have the same mean and
range.
Sample A:
1
1
4
4
5
5
8
8
Sample B:
1
2
3
4
5
6
7
8
a. Construct a 90% confidence interval for the population mean
for sample A
b. Construct a 90% confidence interval...
Assuming that the population is normally distributed, construct a 90% confidence interval for the population mean,...
Assuming that the population is normally distributed, construct
a 90% confidence interval for the population mean, based on the
following sample size of n=7.
1, 2, 3, 4, 5 6, and 24
Change the number 24 to 7 and recalculate the confidence
interval. Using these results, describe the effect of an outlier
(that is, an extreme value) on the confidence interval.
Determine the sample size n needed to construct a 90% confidence interval to estimate the population...
Determine the sample size n needed to construct a 90%
confidence interval to estimate the population mean when sigma
equals 67 and the margin of error equals 10.
n=???????
Determine the sample size n needed to construct a 90% confidence interval to estimate the population...
Determine the sample size n needed to construct a 90%
confidence interval to estimate the population proportion when p
over bar equals 0.64 and the margin of error equals 7%.
n=???
Construct a scatterplot, find the value of the linear correlation coefficient r, find the critical value...
Construct a scatterplot, find the value of the linear
correlation coefficient r, find the critical value of r from Table
A-6 by using a 0.05, and determine whether there is a linear
correlation between the two variables.
Song Audiences and Sales The table below lists
the numbers of audience impressions (in hundreds of millions)
listening to songs and the corresponding numbers of albums sold (in
hundreds of thousands). The number of audience impressions is a
count of the number of...
1. Develop 90 %, 95 %, and 99% confidence intervals for population mean (µ) when sample...
1. Develop 90 %, 95 %, and 99% confidence intervals for
population mean (µ) when sample mean is 10 with the sample size of
100. Population standard deviation is known to be 5.
2. Suppose that sample size changes to 144 and 225. Develop
three confidence intervals again. What happens to the margin of
error when sample size increases?
3. A simple random sample of 400 individuals provides 100 yes
responses. Compute the 90%, 95%, and 99% confidence interval for...
1. Develop 90 %, 95 %, and 99% confidence intervals for population mean (µ) when sample...
1. Develop 90 %, 95 %, and 99% confidence intervals for
population mean (µ) when sample mean is 10 with the sample size of
100. Population standard deviation is known to be 5.
2. Suppose that sample size changes to 144 and 225. Develop
three confidence intervals again. What happens to the margin of
error when sample size increases?
3. A simple random sample of 400 individuals provides 100 yes
responses. Compute the 90%, 95%, and 99% confidence interval for...
find the 95.8% Ci for the population mean. x̅ =18 s=20 n=500 find the 95% and...
find the 95.8% Ci for the population mean.
x̅ =18
s=20
n=500
find the 95% and the 99% CI for the population mean eye
mass of giraffes.
n=27
x̅=53.4g
s=8.6g
Find the 91.7% CI for the difference, the population
mean score for the VGP group minus population mean score for the
NVGP group.
VGP
NVGP
Sample Size
60
60
Mean Score
84.81
82.64
Standard variation
9.56
8.43
A) Find the z critical value for a 90% confidence level: Zc= B) Find the z...
A) Find the z critical value for a 90% confidence level:
Zc=
B) Find the z critical value for an 84% confidence level:
Zc=
C) The higher the confidence, the narrower the confidence
interval
True or False
D) The greater the sample size, the mnarrower the confidence
interval
True or False
E) In a recent study of 84 eighth graders, the mean number of
hours per week that they watched TV was 22.3. Assume population
standard deviation is 5.8 hours....
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