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Duplicate of AP Statistics Review CBCS Chapters 1-6 Flashcards | StudBud
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Duplicate of AP Statistics Review CBCS Chapters 1-6
Duplicate of AP Statistics Review CBCS Chapters 1-6
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A coalition of frisky and fun statistics questions prepare you for a five
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Answers
1
What is the probability that someone who doesn't like skateboards will like snowmobiles?
.286
.238
.647
.714
2
What is boxed in red
Slope
R squared
Standard Error
Y intercept
3
Which of the following statements about 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
4
For a strongly right skewed distribution Elior would use which measures of center and spread
Mean and interquartile range
Median and Interquartile range
Median and Range
Mean and standard deciation
5
A cluster sample where grades 9-12 are labeled 0-3 respectively might look like,
0, 0, 1, 2, 3
0, 0 , 0, 0, 0
1, 1, 1, 1, 1
3, 2, 2, 1, 0
6
What is the standard score/ Z-Score?
Test Statistic
Parameter
Shows the standard deviation
number of standard deviations away from the mean
7
Calculate a Z score for David who can lift 140lb when the average is 100lb with SD of 25lb
2
1.6
1.25
1.5
8
50% of houses have a puppy and 40% have a kitty. 20% of houses have both. What % have neither?
20%
25%
10%
30%
9
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
10
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
$3.8, $0.6
$3.8, $3
$2, $1.8
11
You measure age, height and ice cream preference. The number and type of variables Ian has are
3; two categorical and one quantitative
3; two numbered and one open
3; two quantitative and one categorical
2; two quantitive
12
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
The number of trials is fixed
All outcomes are equally likely
Trials are independent
13
Which residual is the largest
D
A
B
E
14
If A and B are independent then they cannot be mutually exclusive
True
False
Can't tell
15
Approximately what is point C's residual (bottom left point)?
11
-11
-5
20
16
The chance Bo will get AIDS after sex contact with an infected partner is about 1/4. This means
Of 200 people having sex with I P about 50 will get AIDS
Of 10000 people having sex with I P 2500 will get AIDS
20 ppl having sex with I P it is likely 5 ppl will get AIDS
A person will be infected after exactly 4 contacts with I Ps
17
A normal distribution has a mean of 30 and SD of 2.5. What value lies at the 97.5 percentile?
37.5
32.5
35
36
18
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
19
Kiara hits the bull's eye 70%. What's the prb that her first bull's eye happens on her 3 throw.
.7
.063
.233
.13
20
Sat math scores are normal with a mean at 516 and SD of 115. How many kids scored above a 650?
24%
15%
10%
12%
21
The variance of the sum of two random variables X and Y is? (W = standard deviation)
Wx + Wy only if x and y are independent
(Wx)^2 + (Wy)^2 only if x and y are independent
Wx + Wy
(Wx)^2 + (Wy)^2
22
How would you describe this boxplot
Right skewed
There isn't enough information to infer the shape
Left skewed
Approximately normal
23
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
Cluster sample of 11th graders from the state
Matched pairs design
24
Quinn samples every 3rd person who leaves the room. Will this result in a simple random sample?
Yes, because everyone has the same chance of being selected
No, not every possible sample has a chance of being selected
Yes, if everyone walks out the same door
Yes, this is systematic sampling and will make a special SRS
25
Finn's experiment to see the effects of cocoa on school testing gender is blocked. What does this mean?
Everyone will be the same gender; no gender variation
There will be a equal amount of boys and girls in each group
Gender is not important to the survey
Both genders perform the same
26
In a normal distribution how much of the data falls within 2 standard deviations of the mean
99.7%
65%
95%
68%
27
This method prevents under-coverage
Stratified sampling
Randomized Design
SRS
Cluster Sampling
28
What is the standard error based on the Minitab Output
.02325
3.241
12.22
.511
29
What shape is the histogram
Bi-modal
Approximately normal
Uniform
Left skewed
30
Sat math scores are normal with a mean 516 and SD 115. What score would be at the 65 percentile
631
572
560
561
31
Black bear weights are approximately normal with a mean of 250 and SD of 50. P (X > 325)?
.057
.933
.853
.067
32
(Pay attention only to table) What is the prb that the thing has at least 2 of the variable X
0.38
0.85
0.53
0.5
33
Which of the following numbers is/are outliers 0, 3, 3, 3, 4, 5, 5, 6, 7, 7, 12, 14,
12, 14, and 0
none
12 and 14
14 only
34
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.
No, not all kids had the same chance of being chosen.
Yes, because the numbers were assigned randomly to the kids.
Yes, because each kid had the same chance of being chosen.
35
A 52 card deck has 12 face cards. What is the prb of drawing 3 cards and getting 3 face cards?
1%
0.5%
0.1%
0.01%
36
What is the median number of lizards for a zoo?
37
3.7
36
32
37
Ramdog randomly picks 3 lunch tables to sample in a cafeteria where grade levels are all mixed
Blocking
Simple random sample
Stratified sample
Cluster saple
38
There are 5 outcomes to an expt that are calculated to be .34, .5, .42, 0, -.26. Conclusion?
An error was made
The sum of the individual probabilities is one.
One of the outcomes will never occur
One of the outcomes will occur 50% of the time
