Question

If n=28,
x¯(x-bar)=36,
and s=16, construct a confidence interval at a 95% confidence
level. Assume the data came from a normally distributed
population.

Give your answers to one decimal place.

__________ < μ < ________________

Give your answers to one decimal place.

__________ < μ < ________________

Answer #1

Sample mean =36

Sample standard deviation =16

Sample size =28

Level of significance=1-0.95=0.05

Degree of freedom =27

t critical value is (by using t table)=
2.052

If n=28,
x¯(x-bar)=36,
and s=16, construct a confidence interval at a 95% confidence
level. Assume the data came from a normally distributed
population.
Give your answers to one decimal place.
__________ <
μ
< ________________

If n=32, (x-bar)=39, and s=17, construct a confidence interval
at a 80% confidence level. Assume the data came from a normally
distributed population. Give your answers to one decimal place.

If n=13, (x-bar)=34, and s=4, construct a confidence interval at
a 90% confidence level. Assume the data came from a normally
distributed population.
Give your answers to one decimal place.
____ < μμ < ____

If n=15, ¯xx¯(x-bar)=33, and s=10, construct a confidence
interval at a 98% confidence level. Assume the data came from a
normally distributed population.
Give your answers to one decimal place.

If n=30, ¯xx¯(x-bar)=49, and s=10, construct a confidence
interval at a 90% confidence level. Assume the data came from a
normally distributed population.
Give your answers to one decimal place.
_______< ? < ________

If n=18, ¯ x (x-bar)=48, and s=6, construct a confidence
interval at a 98% confidence level. Assume the data came from a
normally distributed population. Give your answers to one decimal
place

If n=21, ¯xx¯(x-bar)=44, and s=17, construct a confidence
interval at a 98% confidence level. Assume the data came from a
normally distributed population.
Give your answers to one decimal place.
< μμ <

If n=14, ¯ x x¯ (x-bar)=46, and s=8, construct a confidence
interval at a 98% confidence level. Assume the data came from a
normally distributed population. Give your answers to one decimal
place.

1. If n=19, ¯xx¯(x-bar)=34, and s=12, construct a confidence
interval at a 95% confidence level. Assume the data came from a
normally distributed population.
Give your answers to one decimal place.
2. In a survey, 11 people were asked how much they spent on
their child's last birthday gift. The results were roughly
bell-shaped with a mean of $50 and standard deviation of $15.
Construct a confidence interval at a 90% confidence level.
Give your answers to one decimal place....

a) If n=10, ¯xx¯(x-bar)=33, and s=10, construct a confidence
interval at a 80% confidence level. Assume the data came from a
normally distributed population.
Give your answers to one decimal place.
< μμ <
b) In a survey, 27 people were asked how much they spent on
their child's last birthday gift. The results were roughly
bell-shaped with a mean of $46 and standard deviation of $8. Find
the margin of error at a 99% confidence level.
Give your answer...

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