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Oakton AP Statistics Review Flashcards | StudBud
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Oakton AP Statistics Review
Oakton AP Statistics Review
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AP stat exam prep
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36 cards
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Questions
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Answers
1
The state administers a new test all 11th graders from 15 randomly selected schools. This is a
Stratified sample of 11th graders from the state
Random sample of 11th graders
Matched pairs design
Cluster sample of 11th graders from the state
2
Which of the following numbers is/are outliers 0, 3, 3, 3, 4, 5, 5, 6, 7, 7, 12, 14,
12 and 14
14 only
none
12, 14, and 0
3
For a variable to have a geometric distribution what condition has to be met?
All outcomes are equally likely
Trials are independent
The probability of success has to be the same for each trial
The number of trials is fixed
4
Black bear weights are approximately normal with a mean of 250 and SD of 50. P (X > 325)?
.933
.853
.057
.067
5
Quinn samples every 3rd person who leaves the room. Will this result in a simple random sample?
Yes, this is systematic sampling and will make a special SRS
Yes, if everyone walks out the same door
Yes, because everyone has the same chance of being selected
No, not every possible sample has a chance of being selected
6
How would you describe this boxplot
Approximately normal
Left skewed
There isn't enough information to infer the shape
Right skewed
7
You measure age, height and ice cream preference. The number and type of variables are
3; two categorical and one quantitative
3; two quantitative and one categorical
3; two numbered and one open
2; two quantitive
8
Which of the following statements abt Correlation is NOT true?
Outliers can dramatically effect the r
If r =0 there is no relationship between the variables
A r of -.87 shows a stronger linear relationship than .7
If r=0, there is no LINEAR relationship btwn the variables
9
What shape is the histogram
Bi-modal
Approximately normal
Left skewed
Uniform
10
Approximately what is point C's residual (bottom left point)?
11, it's an underestimate
-11, it's an overestimate
11, it's an overestimate
-11, it's an underestimate
11
What is the standard error based on the computer output
.02325
12.22
.511
3.241
12
Calculate a Z score for David who can lift 140lb when the average is 100lb with SD of 25lb
1.25
1.5
2
1.6
13
What is your teacher's middle initial?
M
S
C
E
14
3 lunch tables are randomly sampled in a cafeteria where grade levels are all mixed
Blocking
Stratified sample
Cluster saple
Simple random sample
15
50% of houses have a puppy and 40% have a kitty. 20% of houses have both. What % have neither?
10%
25%
30%
20%
16
A school with 15 classes of 24 picks 2 kids from each class with random digits. Random sample?
Yes, because the numbers were assigned randomly to the kids.
Yes, because each kid had the same chance of being chosen.
No, not all kids had the same chance of being chosen.
No, because not all possible groups can be chosen.
17
When asked to describe a distribution mention
The shape and any obvious outliers
The type (histogram, bell curve, box plot, etc.)
mean, IQR, normality/skewness
Shape, outliers, center, spread
18
What is boxed in red
Standard Error
Slope
Y intercept
R squared
19
What is the median number of lizards for a zoo?
37
3.7
36
32
20
P(snow)=.4, P(school close)=.3, P(both)=.2. What is P(school close GIVEN snow)?
0.286
0.75
0.2
0.5
21
What was the purpose of the goldfish activity?
Central limit theorem
Confidence intervals for proportions
Comparing two proportions
Regression and correlation
22
A 52 card deck has 12 face cards. What is the prb of drawing 3 cards and getting 3 face cards?
0.5%
1%
0.1%
0.01%
23
What is the probability that someone who doesn't like skateboards will like snowmobiles?
.286
.647
.238
.714
24
What is the probability that someone who doesn't like skateboards will like snowmobiles?
.714
.647
.238
.286
25
RVs X and Y are independent. SD(X)=3 and SD(Y)=4. What is SD(Y-X)?
sqrt(16+9)
1
Sqrt(16-9)
-1
26
If A and B are independent then they cannot be mutually exclusive
False
Can't tell
True
27
Which residual is the largest
B
E
A
D
28
Finn's exprmnt to see the effects of cocoa on school testing gender is blocked. Whats this mean
Everyone will be the same gender; no gender variation
There will be a equal amount of boys and girls in each group
Both genders perform the same
Gender is not important to the survey
29
SAT math scores are normal with a mean 516 and SD 115. What score would be at the 65 percentile
631
561
572
560
30
In a normal distribution how much of the data falls within 2 standard deviations of the mean
68%
95%
99.7%
65%
31
What is the standard score/ Z-Score?
number of standard deviations away from the mean
Test Statistic
Shows the standard deviation
Parameter
32
Rymy tips $2 and 20% of his meal. Meals have the M 9 and SD 3. What is the M and SD of his tips
$2, $1.8
$3.8, $3
$9.8, $0.3
$3.8, $0.6
33
This method prevents under-coverage
Stratified sampling
SRS
Randomized Design
Cluster Sampling
34
SAT math scores are normal with a mean at 516 and SD of 115. How many kids scored above a 650?
15%
24%
12%
10%
35
Kiara hits the bull's eye 70%. What's the prb that her first bull's eye happens on her 3 throw?
.063
.7
.13
.233
36
For a strongly right skewed distribution Elior would use which measures of center and spread
Mean and standard deciation
Median and Interquartile range
Mean and interquartile range
Median and Range
