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Stats Review (2nd half of year) Flashcards | StudBud
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Stats Review (2nd half of year)
Stats Review (2nd half of year)
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1
When should you reject the null hypothesis?
alpha < power
alpha > p-value
beta < power
alpha < p-value
2
T or F: You will need to bring your formula sheets to the test.
True
False
3
Determine the sampling method.
Systematic Sampling
Convenience Sampling
Simple Random Sampling
Cluster Sampling
4
The p-value of a statistical test is ....
Given the null is true, it is the prob of the obs. or more extreme value
The probability that the alternative is true
The probability that the null is true
Probability of the observation or one more extreme occuring
5
How do you find the residual?
predicted (x) - observed (x)
observed (x) - predicted (x)
predicted (ŷ) - observed (y)
observed (y) - predicted (ŷ)
6
When is the Statistics Final Exam?
May 4
June 5
Tomorrow
July 5
7
What is bias?
when you receive unexpected results
the failure of a sampling method to represent the population
improper hypothesis testing
when the entire population is surveryed
8
If the p is low...
Reject the Ho
then the ho must go
reject the null hypothesis
the ho must go
9
We use a t-distribution instead of a z-distribution when.....
μ is unknown
Low sample size
When performing a One Prop Z Test
σ is unknown
10
How long do teens typically spend brushing their teeth? (Which test/interval is best?)
Two sample t
One sample z
Two sample z
One sample t
11
What is the difference between parameters and statistics?
parameters not exact, statistics are exact
parameters from sample, statistics from the population
parameters from the population, statistics from the sample
parameters are exact, statistics not
12
You are going to rock this test on May 4th!
Yes. I am a real statistician!
It will be slayed.
Of course I am!
YES!
13
Which of the following is resistant?
Median & IQR
Median & Range
Mean & Range
Mean & Standard deviation
14
Increasing sample size would NOT reduce which of the following?
bias
margin of error
variability
P(Type 2 error)
15
Is the percent of students with Twitter different from the population? (Which test/interval is best?)
One sample z
Two sample t
Two sample z
One sample t
16
Which formula describes Degrees of Freedom?
m-1
n-(-1)
n+1
n-1
17
Strong evidence against the null hypothesis exists when?
The p-value is large
The power is large
The p-value is small
alpha > p-value
18
Which test/interval is best? "Which brand of AA batteries last longer - Duracell or Everyready?"
One sample t
Two-sample z
Two sample t
One-sample z
19
Which of the following set of numbers constitutes the Empirical Rule?
68 - 90 - 99.7
68 - 95 - 99.7
69 - 95 - 99.7
68 - 90 - 99.5
20
Below is a confidence interval, what is the x-bar called?
standard error
Margin of error
sample mean
point estimate
