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AP Statistics Review Chapters 1-6 Flashcards | StudBud
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AP Statistics Review Chapters 1-6
AP Statistics Review Chapters 1-6
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1
What is the standard score/ Z-Score?
number of standard deviations away from the mean
Shows the standard deviation
Test Statistic
Parameter
2
Binomial or Not?
no
yes
3
The variance of the difference of two random variables X and Y is...
ơX+ơY if X & Y are independent
ơX + ơY
(ơX)2 + (ơY)2
(ơX)2+(ơY)2 if X & Y are independent
4
You measure age, height and ice cream preference. The number and type of variables Ian has are
3; two numbered and one open
3; two categorical and one quantitative
3; two quantitative and one categorical
2; two quantitive
5
A normal distribution has a mean of 30 and SD of 2.5. What value lies at the 97.5 percentile?
32.5
35
37.5
36
6
If A and B are independent then they cannot be mutually exclusive
Can't tell
True
False
7
For a strongly right skewed distribution Ellie would use which measures of center and spread
Mean and standard deciation
Median and Range
Mean and interquartile range
Median and Interquartile range
8
A cluster sample where grades 9-12 are labeled 0-3 respectively might look like,
0, 0 , 0, 0, 0
0, 0, 1, 2, 3
1, 1, 1, 1, 1
3, 2, 2, 1, 0
9
For a variable to have a geometric distribution what condition has to be met?
The probability of success has to be the same for each trial
All outcomes are equally likely
Trials are independent
The number of trials is fixed
10
A 52 card deck has 12 face cards. What is the prb of drawing 3 cards and getting 3 face cards?
0.01%
0.5%
0.1%
1%
11
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
$9.8, $0.3
$2, $1.8
$3.8, $0.6
$3.8, $3
12
The state administers a new test all 11th graders from 15 randomly selected schools. This is a
Cluster sample of 11th graders from the state
Matched pairs design
Stratified sample of 11th graders from the state
Random sample of 11th graders
13
How would you describe this boxplot
Approximately normal
Right skewed
Left skewed
There isn't enough information to infer the shape
14
The variance of the sum of two random variables X and Y is? (W = standard deviation)
(Wx)^2 + (Wy)^2 only if x and y are independent
Wx + Wy
Wx + Wy only if x and y are independent
(Wx)^2 + (Wy)^2
15
Sat math scores are normal with a mean at 516 and SD of 115. How many kids scored above a 650?
12%
24%
10%
15%
16
Calculate a Z score for David who can lift 140lb when the average is 100lb with SD of 25lb
1.5
1.6
2
1.25
17
There are 5 outcomes to an expt that are calculated to be .34, .5, .42, 0, -.26. Conclusion?
One of the outcomes will never occur
The sum of the individual probabilities is one.
An error was made
One of the outcomes will occur 50% of the time
18
Which of the following statements abou Correlation is NOT true? (CC = correlation coefficient)
If the C is 0 there is no relationship between the variables
A CC of -.87 shows a stronger linear relationship than .7
Outliers can dramatically effect the CC
19
In a normal distribution how much of the data falls within 2 standard deviations of the mean
95%
68%
65%
99.7%
20
(Pay attention only to table) What is the prb that the thing has at least 2 of the variable X
0.53
0.85
0.38
0.5
21
Sat math scores are normal with a mean 516 and SD 115. What score would be at the 65 percentile
631
561
560
572
22
What shape is the histogram
Uniform
Bi-modal
Approximately normal
Left skewed
23
Finn's experiment to see the effects of cocoa on school testing gender is blocked. Whats this mean
Gender is not important to the survey
Both genders perform the same
There will be a equal amount of boys and girls in each group
Everyone will be the same gender; no gender variation
24
50% of houses have a puppy and 40% have a kitty. 20% of houses have both. What % have neither?
30%
25%
10%
20%
25
What is the probability that someone who doesn't like skateboards will like snowmobiles?
.286
.238
.714
.647
26
In BINOM dist for P(x < 5), do this:
binomcdf 5 ...
binompdf 4 ...
binomcdf 4...
binompdf 5 ...
27
Kiara hits the bull's eye 70%. What's the prb that her first bull's eye happens on her 3 throw.
.063
.233
.7
.13
28
Which of the following numbers is/are outliers 0, 3, 3, 3, 4, 5, 5, 6, 7, 7, 12, 14,
14 only
none
12, 14, and 0
12 and 14
29
Which residual is the largest
A
B
E
D
30
What is the median number of lizards for a zoo?
36
32
37
3.7
31
What is boxed in red
Standard Error
Slope
Y intercept
R squared
32
Ramdog randomly picks 3 lunch tables to sample in a cafeteria where grade levels are all mixed
Simple random sample
Blocking
Cluster saple
Stratified sample
33
What is the standard error based on the Minitab Output
12.22
.511
.02325
3.241
34
When asked to describe a distribution mention
The type (histogram, bell curve, box plot, etc.)
Shape, outliers, center, spread
The shape and any obvious outliers
mean, IQR, normality/skewness
35
This method prevents under-coverage
Stratified sampling
SRS
Randomized Design
Cluster Sampling
36
P of snow is .4, P of school close is .3, P of BOTH is .2. What is P of school close GIVEN snow
0.5
0.2
0.75
0.286
37
Approximately what is point C's residual (bottom left point)?
11
-5
-11
20
38
Black bear weights are approximately normal with a mean of 250 and SD of 50. P (X > 325)?
.933
.057
.853
.067
39
Quinn samples every 3rd person who leaves the room. Will this result in a simple random sample?
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
Yes, this is systematic sampling and will make a special SRS
40
A school with 15 classes of 24, picks 2 kids from each class with random digits. Random sample?
No, because not all possible groups can be chosen.
Yes, because each kid had the same chance of being chosen.
Yes, because the numbers were assigned randomly to the kids.
No, not all kids had the same chance of being chosen.
