
Confidence Intervals Mean
Authored by Anthony Clark
Mathematics
12th Grade

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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which confidence would result in a wider interval (assuming nothing else changed), 91% or 97%?
97%, z* is larger for higher confidence intervals
97%, the standard error is larger for higher confidence intervals
91%, z* is larger for lower confidence intervals
91%, the standard error is smaller for lower confidence intervals
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A __________ gives an interval of plausible values for the _____________.
confidence interval, statistic
point estimate, parameter
point estimate, statistic
confidence interval, parameter
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Does the interval (3, 14) support the claim that the mean of a data set is 2.9
Yes
No
Not enough information.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Increasing the sample size __________ the confidence interval.
increases
decreases
does not affect
there is not enough evidence to determine the answer
5.
MATCH QUESTION
1 min • 1 pt
I randomly select 25 students’ Math SAT scores and find the mean to be 600. I know the standard deviation of the population is 50. Find a 95% Confidence Interval.
Identify the Variables
25
σ
2.064
x-bar
600
n
50
t*
6.
MATCH QUESTION
1 min • 1 pt
You sample 12 bugs and find the sample mean is 2.40 cm. You are told the sample standard deviation is 0.2 cm. Find a 95% Confidence Interval.
12
x-bar
0.2
n
2.201
t*
2.40
s
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
I randomly select 25 students’ Math SAT scores and find the mean to be 600. I know the standard deviation of the population is 50. Find a 95% Confidence Interval.
95% confident the sample mean is between 580.4 and 619.6
95% confident the population mean is between 583.55 and 616.45
95% confident the population mean is between 579.36 and 620.64
95% confident the population mean is between 574.2 and 625.8
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