Confidence Intervals for Means Sigma Known
Authored by Anthony Clark
Mathematics
12th Grade
Used 2+ times
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15 questions
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1.
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
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A 90% confidence interval for the mean speed driven by cars on Due West Road is given by (21, 45). What was the sample mean of this study?
12
24
33
None of these.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A 90% confidence interval for the mean speed driven by cars on Due West Road is given by (21, 45). What was the margin of error of this interval?
12
24
33
None of these.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A 90% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 45 CEOs. The interval was $139,048 to $154,144. Give the interpretation of the interval.
90% of the sampled CEOs have salaries that fell in the interval $139,048 to $154,144
We are 90% confident that the mean salary of all CEOs in the electronics industry falls in the interval $139,048 to $154,144.
There is a 90% chance that CEOs in the electronics industry have salaries that fall between $139,048 to $154,144
We are 90% confident that the mean salary of the sampled CEOs falls in the interval $139,048 to $154,144.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
When we say we have a 90% confidence interval, what are we 90% confident of?
That the population mean is within the interval boundaries
That the population mean is outside the interval boundaries
That the sample mean is within the interval boundaries
That the sample mean is outside the interval boundaries
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What are the critical z-values for a 80% confidence interval?
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What are the critical z-values for a 90% confidence interval?
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