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SR Unit 2 Test Review Flashcards | StudBud
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SR Unit 2 Test Review
SR Unit 2 Test Review
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1
Juanita's debt is in the 90th percentile. Explain what this means.
Her amount of debt is less than 90% of people with debt.
She is responsible for 90% of everyone's debt.
She is responsible for only 90% of her debt.
Her amount of debt is greater than 90% of people with debt.
2
All of these ARE characteristics of the normal distribution curve
EXCEPT
?
Symmetric about the mean
Bell Shaped
Most of the data is away from the mean
Only has 1 peak: unimodal
3
Where is the mean located?
at B
at A
at C
Can not be determine
4
George tells you that his SAT score is in the 70th percentile. Explain to him what that means.
70% of the scores were below his score, and 30% were above his score.
70% of the scores were below his score, and 70% were above his score
30% of the scores were below his score, and 70% were above his score.
30% of the scores were below his score, and 30% were above his score.
5
Who scored relatively better?
The Z-score for John is larger, so he did worse
The Z-score for Bob is larger, so he did better
The Z-score for John is larger, so he did better
The Z-score for Bob is smaller, so he did worse
6
Find P(z > 1.56)
.4406
.9406
.0594
.4394
7
A standardized score (z-score) is
the number of units to count by when constructing a bell curve
the positive or negative empirical rule value
the number of standard deviations a value is from the mean
the score that corresponds to a test grade when needed out of five points
8
Describe the shape of a standard normal curve.
Symmetric and bell-shaped
Cumulative frequency curve
Skewed left
Skewed right
9
Mean = 23.6, SD = 7.45. What is the minimal score for the top 20%?
0.84
25
17
30
10
For a normal distribution with a mean of 60 and a SD of 7, what percentage is greater than 59?
55.68%
44.32%
5.68%
94.32%
11
Where is the median located?
at C
Can not be determine
at A
at B
12
A normal distribution of data is symmetrical about the:
mode
mean
Q1
the statistician
13
Find P(z > 1.5)
0.4222
0.4998
0.0668
0.4332
14
How do I find a probability under the normal curve?
2nd Vars – invNorm(area, µ σ)
2nd Vars – normal cdf
2nd Vars – geometpdf(n, p, x)
2nd Vars – normal pdf
15
For a Normal Distribution with a Mean of 110 and a SD of 24. Find P(48 < x < 189).
0.9946
.9134
0.0054
.5438
16
The mean is 10, and standard deviation of 2, Amaryllis has a z-score of .5, what is her score?
11
14
8
12
17
For a Normal Distribution, mean: 234 and SD: 38, find the
z-score
corresponding to x = 256. Round your answer.
0.58
-0.57
-0.58
0.57
18
Using this mean of 70 and SD of 4, around what percent of people scored between a 66 and a 74?
95%
34%
68%
99.7%
19
Based on the notation N( 345, 22) what is the value of 22?
mean
median
IQR
standard deviation
20
Find the z-score for the 18th Percentile.
.67
-55
.76
-.92
21
The two statistics necessary to describe a normal curve are ______ and _______.
the mean and the standard error.
the median and the standard deviation.
the units of the X and Y axes of the curve.
the mean and the standard deviation.
22
Johnny is at the 63rd percentile, what is his z-score?
.95
45
.33
.59
