Confidence Intervals and Population Size Review
Quiz
•
Mathematics
•
11th - 12th Grade
•
Hard
Barbara White
FREE Resource
12 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
In a crash test of 15 troopers, collision repair costs are found to have a distribution that is approximately normal, with a mean of $1800 and a sample standard deviation of $950. What type of interval would this be?
z interval
t interval
1-prop z interval
None of these.
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Agricultural researchers plant 100 plots with a new variety of corn and measure the mean yield for these plots in bushels per acre. They treat the 100 plots as a simple random sample of possible plots of corn (as researchers often do) and report a 95% confidence interval for the mean corn yield of (128.4, 131.6) bushels per acre. Which of the following is a correct interpretation of the 95% confidence level?
We are 95% confident that the true mean yield for this new variety of corn is captured by the interval (128.4, 131.6) bushels per acre
If many intervals were constructed this way from many independent sets of 100 plots, 95% of the intervals would capture the true mean corn yield.
If many intervals were constructed this way from many independent sets of 100 plots, 95% of the time the true mean corn yield would be in the interval (128.4, 131.6) bushels per acre.
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
A radio talk show host is interested in the proportion p of adults in his listening area who think that the drinking age should be lowered to 18. To find this proportion, he poses the following question to his listeners: “Do you think that the drinking age should be reduced to 18?” He asks listeners to phone in and vote “yes” or “no” depending upon their opinions. Of 200 people who phone in, 140 answer “yes.” What type of interval should be used?
z interval
t interval
1-prop z interval
none of these
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