Probability and Statistics Pretest
Quiz
•
Mathematics
•
11th Grade
•
Practice Problem
•
Hard
Anthony Clark
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
John Paul conducted a poll survey in which 320 out of 600 randomly selected voters indicated their preference for a certain candidate. He uses 95% confidence interval. What is the confidence interval estimate of the population proportion who prefer the candidate?
50% < p < 56%
48% < p < 58%
44% < p < 62%
42% < p < 64%
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In a 99% confidence level with margin of error 0.20 and sample proportion 0.45, what is the sample size to be used?
41
42
43
44
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A politician engaged the services of a private opinion pollster to determine the sample size needed among his constituents to interview about their perceptions on the freedom of information bill. Previous polls revealed that approximately 62% are in favor of the bill. The politician adopted 95% level of confidence and off the value of the population by at most 0.02. What should be the sample size?
1603
1604
2262
2263
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
10
1
0.1
0.01
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Using the z table, what is the critical value when the level of significance a = 0.10 and it is a left-tailed test?
0.25
0.26
1.28
1.29
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Smaller p-values indicate more evidence in support of:
the null hypothesis
the alternative hypothesis
the quality of the researcher
further testing
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is a random variable?
A random variable is a variable that only takes on values from a specific set of outcomes.
A random variable is a constant that represents a specific event in a process.
A random variable is a fixed number that does not change.
A random variable is a variable that takes on numerical values determined by the outcomes of a random process.
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