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Chapter 9 and 10 Competition Flashcards | StudBud
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Chapter 9 and 10 Competition
Chapter 9 and 10 Competition
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Answers
1
40% pass the Oregon driver's test on the first try. We want to test this value as a single population mean problem.
False
True
2
Which is not true of the t-distribution?
It is used when we do not know the population standard deviation
Its true shape is dependent upon the sample size
It was developed by a brewer
The z-score is used in the calculation of the p-value
3
Hypothesis testing for two populations applies for:
Situations that deal with the comparisons of two independent groups
All answers are correct
Testing effects of Drug A in group 1 and Drug B in group 2, by proportion
Testing the before and after effects of a drug within a single group
4
The null hypothesis typically...
Contains an equals sign
implies agreement between the sample and the population
is rejected when the p-value is low
All statements are correct about the null hypothesis
5
The following is true about a p-value
It represents a probability
It is graphically depicted by the area under a continuous function
All are true
Can be used to accept or reject a claim being made
6
The graph represents our brides problem. The following can be concluded:
50% of brides being younger than grooms is an overestimate
Brides are marrying older men on average.
Reject the null hypothesis
Do not reject the null hypothesis based on sample results
7
Which of the following is incorrect about the graph below...
The alternative hypothesis is: HA= X bar < 16
We are dealing with population means
The sample mean was 16
The null hypothesis is: H0 = X bar = 16.43
8
A study is done to determine if Company A retains its workers longer than Company B, on average. This is a...
Comparison of a population proportion and a population mean.
Comparison of two population proportions
Comparision of 2 population means
Comparison of matched pairs
9
A new prep class was designed to improve SAT test scores. An example of a matched pairs study would be:
Compare the groups' scores on practice tests before and after the prep clas
Compare two different groups who both took the prep course before testing.
Compare two different groups who did not take the prep course before testin
Compare two different groups on their scores one having taken the prep clas
10
In order to test a single population proportion, the conditions of what distribution must be satisfied?
Uniform
Exponential
Geometric
Binomial
11
We want to test that 50% of brides are younger than grooms. Sample data: 100 brides sampled, 53 are younger. P' =
0.50
0.53
50
53
12
The purpose of a hypothesis test is to:
Prove the truth about a population mean
Design an experiment
Test a claim
Display graphical findings
13
What can be concluded based on the image below?
There is proof that that the null hypothesis is false
Do not reject null hypothesis
Reject null hypothesis
There is proof that the null hypothesis is true
14
A normal test is not assumed when you are dealing with
Single Population Mean (Standard Deviation Known)
Two Population Proportions
Single Population Proportion
Single Population Mean (Standard Deviation Not Known)
15
Jin thinks that her rock climbing equipment may not be safe when, in fact, it really is safe. This is an example of...
Type I Error
Right-Tailed Test
Two-Sided Test
Type II Error
16
When comparing two population proportions of groups A and B, the following is true
Ho: P= population proportion value of Group A
Ho: P= population proportion value of Group B
Ho: P = no difference between population proportion (PA-PB = 0)
Ho: P = a positive difference between population proportions (PA=PB=0)
