Confidence Interval

Quiz
•
Mathematics
•
12th Grade
•
Hard
Barbara White
FREE Resource
9 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A sample size of n = 64 is drawn from a population whose standard deviation is σ = 5.6.
Find the margin of error for a 99% confidence interval for µ.
1.799
1.798
1.803
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
The lifetime of a certain type of batter is known to be normally distributed with a standard deviation of 20 hours. A sample of 50 batteries had a mean lifetime of 120.1 hours. It is desired to construct a 99% confidence interval for the mean lifetime of this type of battery.
What is the Confidence Interval to one decimal place?
(114.5, 125.6)
(112.8, 127.4)
(112.82, 127.38)
(114.56, 125.64)
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If the 95% Confidence Interval for a population mean is (114.56, 125.54), then is it likely that the true population mean µ is greater than 130?
Yes
No
Not enough information
I have no idea what you're asking of me
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
A population has a standard deviation of σ = 17.3. How large of a sample must be drawn so that a 95% confidence interval for µ will have a Margin of Error equal to 1.4?
586.6
587
586
585
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A person selects a random sample of 15 credit cards and determines the annual interest rate, in percent, of each one. The sample mean is 12.42 with a sample standard deviation of 1.3. It is desired to construct a 90% Confidence Interval.
Find the Standard Error to three decimal places.
0.336
0.33566
13.156
0.087
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
You are given two sets of data measuring the same information, both with the same sample size. Set A has a larger Standard Error than Set B. If you were looking for a 99.8% Confidence Interval, which set would have a larger Margin of Error?
Set A
Set B
Not enough information
I have no idea what you're asking me to do
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
True or False:
The more confident you want to be, the smaller your confidence interval will be.
True
False
8.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
True or False:
The larger your confidence interval is, the more sure (higher confidence level) you can be.
True
False
9.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
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