Sample Mean and Sample Proportion

Quiz
•
Mathematics
•
12th Grade
•
Hard
Anthony Clark
FREE Resource
14 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
10% of people are left handed. If 800 people are randomly selected, find the likelihood that at least 12% of the sample is left handed.
0.0297
0.0106
0.0409
0.0816
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
10% of people are left handed. Of the following, what is the smallest sample size needed to be at least 90% sure that the sample proportion will be between 9% and 11%?
1500
2000
2500
3000
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following is the central limit theorem used for?
The standard deviation of the distribution of sample means is found by dividing the population standard deviation by n.
The distribution of sample means will be approximately normal if the sample size is at least 30.
The distribution of sample proportions is approximately normal if both np and n(1 - p) are greater than or equal to 10.
As sample size increases, variability decreases.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A company has 500 employees and wants to evaluate a proportion using the distribution of sample proportions and normal curve. Under which circumstance will they be able to do this?
n = 80, p = .2
n = 40, p = .2
n = 40, p = .9
n = 30, p = .4
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
It is computed by getting the weighted average of all possible values of a random variable.
mean
variance
standard deviation
binomial distribution
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Given an SRS of 30 math scores, what is an estimate of the true proportion of students in this population that score over 650 in math?
One-Proprtion z-Test
One-Proportion z-Interval
One-Sample t-Interval
One-Sample t-Interal on Matched Pairs
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Given an SRS of 20 math scores. Do we have reason to believe that the true proportion of students who score below 600 in math is not 50%?
One-Proportion z-Test
One-Sample t-Test
One-Sample t-Test on Matched Pairs
Two-Proportion z-Test
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