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Normal Distributions Review Flashcards | StudBud
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Normal Distributions Review
Normal Distributions Review
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Normal Distributions Intro
Flashcards
17 cards
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Practice quiz
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Questions
17
Answers
1
What is the z-score if the standard deviation is 10, the mean is 50, and the value is 30?
2
-2
-5
5
2
What does this symbol represent in statistics?
Standard Deviation
Mean
Normal Distribution
The letter O waving
3
What is the z-score if the standard deviation is 5, the mean is 40, and the value is 45?
-5
5
-1
1
4
What is the probability that a z-score is between -1.5 and 1.5?
0.8664
0.1336
0.0668
0.9332
5
What is the formula for find the z-score of a value?
z = (μ - 𝒙)/σ
z = μ - σ
z = (𝒙 - μ)/σ
z = (σ - μ)/𝒙
6
All of these are characteristics of the normal distribution curve EXCEPT?
Bell Shaped
Only has 1 peak: unimodal
Most of the data is away from the mean
Symmetric about the mean
7
What percentage of the population is within three standard deviations of the mean?
95%
75%
99.7%
68%
8
The total area under a normal distribution curve is...
0
100
3
1
9
Find the probability of z occurring in the shaded region under the standard normal curve.
0.8485
0.1515
0.9032
0.0968
10
What is the area under the normal distribution curve to the right of z = 1.23?
0.0547
0.3907
0.8907
0.1093
11
On a z-table, the shading always shades...
from the outside
in the middle
from the right
from the left
12
What percentage of the population is within one standard deviation of the mean?
25%
68%
99.7%
95%
13
Find the probability of z occurring in the shaded region under the standard normal curve.
0.5244
0.5122
0.4878
0.0122
14
Find the probability of z occurring in the shaded region under the standard normal curve.
0.0214
0.9786
0.0107
0.9893
15
What is the area under the normal distribution curve to the left of z = 1.23?
0.1093
0.8907
0.0547
0.3907
16
What does this symbol represent in statistics?
Mean
Normal Distribution
Standard Deviation
Population
17
What percentage of the population is within two standard deviations of the mean?
95%
50%
99.7%
68%
