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Statistics Review
What is a convenience sample
What is a type 2 error
Statistics Review
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1
What is a type 2 error
Incorrectly rejecting the null hypothesis
Incorrectly keeping the null hypothesis
2
What is a convenience sample
Calling people in the phone book if it's a convenient time.
Surveying the people who are the easiest
Surveying all the people on one block.
3
What is a complement?
The probability of an event not happening
The probability the either event a or event b happens
When you tell someone they look good
4
Margin of Error
Range of values on either side of an estimate
The likelihood you're wrong
5
what are statistics
Mrs. Perry's fav past-time
a type of math calculated from a set of data duh
i dont even know
Yikes
6
What is a type 1 error?
false negative
incorrectly retaining a false null hypothesis
rejection of a true null hypothesis
7
With respect to experimental design, which of the following statements are true?
Randomization controls for effects of lurking variables.
Each experimental factor has one treatment level.
Blinding controls for the effects of confounding.
All of the above.
8
What is the linear regression equation?
y=a^2+bx
y= a=bc
y=a+bx
9
In an experiment if you doubles the sample size, which of the following will increase?
The effect size of the hypothesis test.
The probability of making a Type II error.
The power of the hypothesis test.
None of the others
10
A sample consists of four observations: {1, 3, 5, 7}. What is the standard deviation?
4.33
3.58
1.33
2.58
11
Standard Deviation of a Discrete Random Variable X
σₓ=√(σ²ₓ).
σₓ=√(np(1-p)).
12
When describing a distribution of quantitative data, don't forget your....
SOCS
CROCS
SHOES
13
Which of the following statements are true?
Increasing the sample size tends to reduce survey bias.
guard against bias from undercoverage use convenience sample
Random sampling is a good way to reduce response bias.
None of the other
14
X and Y are ind rand var. The var of X = 16; var of Y = 9. Let Z = X - Y. What is the sd of Z?
25
15
5
10
15
what variable places an individual into one of several groups or categories?
Categorical
Quantitative
16
A coin is tossed three times. What is the probability that it lands on heads
exactly
one time?
.375
.333
.125
.195
17
What is an experimental unit?
What you are experimenting with
The group of people conducting the experiment
The individuals in the experiment
The degree to which you care about your experiment
18
what is bimodal?
having 2 modes
having 1 mode
having 3 modes
19
What is alpha?
The probability of a type 1 error
the probability of a type 2 error
20
What is a median
Q1
high value-low value
a type of graph
middle value
21
The test has mean score of 100 and sd of 15. If a z-score is 1.20, what was score on the test?
118
88
68
105
22
A card is drawn randomly from deck of cards. What the prob that you will draw spade or an ace?
17/52
4/13
1/16
13/52
23
what is a 5 number summary
Min, Max, Mode, Q1, Q3
Q1, Q2, Q3, Q4
Mean, Median, Mode
min, max, Q1, Q3, median
24
What is a parameter
all the cases we actually examine
standard deviation of residuals
all the cases in a sample
a population measure
25
What is power?
alpha
1 - beta
beta
1 - alpha
