
Review Confidence interval Intro
Quiz
•
Mathematics
•
9th - 12th Grade
•
Practice Problem
•
Medium
Standards-aligned
Ashley Knight
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9 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A random sample of residents in city J were surveyed about whether they supported raising taxes to increase bus service for the city. From the results, a 95 percent confidence interval was constructed to estimate the proportion of people in the city who support the increase. The interval was (0.46,0.52). What is the point estimate?
0.49
0.04
0.08
0.98
0.06
Tags
CCSS.HSS.IC.B.4
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A random sample of residents in city J were surveyed about whether they supported raising taxes to increase bus service for the city. From the results, a 95 percent confidence interval was constructed to estimate the proportion of people in the city who support the increase. The interval was (0.46,0.52). What is the margin of error?
0.49
0.04
0.08
0.98
0.06
Tags
CCSS.HSS.IC.B.4
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A random sample of residents in city J were surveyed about whether they supported raising taxes to increase bus service for the city. From the results, a 95 percent confidence interval was constructed to estimate the proportion of people in the city who support the increase. The interval was (0.46,0.52). Which statement correctly interprets the 95% interval in context?
There is a 95% chance that the interval (0.46,0.52) contains the true proportion of peopl in the city who support the increase
We are 95% confident that the true proportion of people in the city who support the increase is captured in the interval (0.46,0.52)
If we take many samples, about 95% of them will contain the interval (0.46,0.52)
There is a 95% probability that the interval (0.46,0.52) contains the true proportion of people in the city who support the increase
The probability that the interval (0.46,0.52) captures P is either 0 or 1, but we don’t know which.
Tags
CCSS.HSS.IC.B.4
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A random sample of residents in city J were surveyed about whether they supported raising taxes to increase bus service for the city. From the results, a 95 percent confidence interval was constructed to estimate the proportion of people in the city who support the increase. The interval was (0.46,0.52). Which statement correctly interprets the 95% level in context?
There is a 95% chance that the interval (0.46,0.52) contains the true proportion of peopl in the city who support the increase
We are 95% confident that the true proportion of people in the city who support the increase is captured in the interval (0.46,0.52)
If we take many samples, about 95% of them will contain the interval (0.46,0.52)
There is a 95% probability that the interval (0.46,0.52) contains the true proportion of people in the city who support the increase
The probability that the interval (0.46,0.52) captures P is either 0 or 1, but we don’t know which.
Tags
CCSS.HSS.IC.B.4
5.
OPEN ENDED QUESTION
1 min • 1 pt
A random sample of 10 employees of a company was selected to estimate the mean one-way commute time for all employees at the company. A 90% confidence interval found a point estimate of 38 and margin of error of 3.5. What is the parameter of interest?
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6.
OPEN ENDED QUESTION
1 min • 1 pt
A random sample of 10 employees of a company was selected to estimate the mean one-way commute time for all employees at the company. A 90% confidence interval found a point estimate of 38 and margin of error of 3.5. Calculate the 90% confidence interval.
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7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What would happen to the interval if we increased the sample size?
Everything would stay the same
The Margin of Error would increase
The Margin of Error would decrease
The point estimate would increase
The point estimate would decrease
Tags
CCSS.HSS.IC.B.4
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