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Ap Statistics Chapter 9 Flashcards | StudBud
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Ap Statistics Chapter 9
Ap Statistics Chapter 9
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1
We reject Ho when Ho is true
Type II error
Type I error
Correct decision
Type III error
2
A formal procedure for using observed data to decide between 2 competing hypotheses.
finding the mean
significance level
z interval
significance test
3
One way to increase the power of a test
decrease effect size
Increase alpha
decrease alpha
decrease sample size
4
Conditions for a significance test for a proportion
Normal: Central Limit Theorem
Random: SRS or "random sample of..."
Normal: Large Counts
10% condition: n≤ 1/10N
5
When performing a significance test you are trying to find convincing evidence for the alternative
False
True
6
A type II error is when we fail to reject Ho when Ha is true
True
False
7
Would using an alpha of 0.01 instead of 0.05 increase or decrease the power of a test.
Power would increase
Power would decrease
Variability would decrease
Power would stay the same
8
One-sided alternative hypothesis
Ha: parameter ≠ o
Ha: parameter < value or > value
Ha: parameter= 0
Ha: parameter ≠ value
9
Match the graph to the hypothesis
Ha: p = p0
Ha: p < p0
Ha: p ≠ p0
Ha: p > p0
10
Formula to find the standardized test statistic
z = statistic-parameter/ SE
z = p-p̂/SE
z = statistic- parameter/ n
z = parameter-statistic/ SE
11
After performing a significance test a student found a p-value of 0.04. The student would.... at α = 0.1
Not find convincing evidence for Ho
Fail to reject the null
Find convincing evidence for the Ha
Reject the null
