Confidence Interval CYU
Quiz
•
Mathematics
•
9th - 12th Grade
•
Practice Problem
•
Easy
Rachel Cooper
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8 questions
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1.
MATH RESPONSE QUESTION
2 mins • 1 pt
You take sample of 200 M&Ms and find that 28 of them are red. What is the value of p̂ for this sample?
We call p̂ the point estimate for the population parameter p.
Mathematical Equivalence
ON
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
You take sample of 200 M&Ms and find that 28 of them are red. Based on your sample, you estimate that 14% of all M&Ms are red. Why can't we say that 14% of all M&Ms are red?
The sample was not large enough.
The point estimate will vary from one sample to another.
The statistic never equals the parameter.
People keep eating the red M&Ms.
3.
MATH RESPONSE QUESTION
2 mins • 1 pt
Mathematical Equivalence
ON
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Because p̂ is the parameter.
Because we want to know how much the p̂'s vary, not the p's.
Because p̂ is a more accurate number than p.
Because we only have p̂ since the only information we have is from our sample.
5.
MATH RESPONSE QUESTION
2 mins • 1 pt
With a point estimate of p̂=0.14 and a margin of error of 0.0491, what is the lower end of the confidence interval?
Mathematical Equivalence
ON
6.
MATH RESPONSE QUESTION
2 mins • 1 pt
With a point estimate of p̂=0.14 and a margin of error of 0.0491, what is the upper end of the confidence interval?
Mathematical Equivalence
ON
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Our 95% confidence interval is (0.0909, 0.1891). What is this interval an estimate of?
The proportion of M&Ms that get eaten.
p=the population proportion of all M&Ms that are red.
p̂=the sample proportion of M&Ms that are red.
The proportion of red M&Ms in any sample of 200 M&Ms.
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