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Ch 6 Normal Models Flashcards | StudBud
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Ch 6 Normal Models
Ch 6 Normal Models
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A #statistics quiz about #zscores and #normal probability
Flashcards
10 cards
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Practice quiz
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Questions
10
Answers
1
If you want to find out P(z > 0.13) what should you enter into your calculator?
normalcdf(-1E99, 0.13)
normalcdf(0.13, 1E99)
normalcdf(-0.13, 0.13)
invNorm(0.13)
2
Which of these statements are true about the symbols used for mean and standard deviation?
μ represents the population mean
s represents the sample standard deviation
all of the above
x-bar represents the sample mean
3
If you subtract a constant from every value in a data set, which statistic won't change?
Q1
Maximum
Range
Mean
4
Which is more unusual?
An observation that falls at the 5th percentile
an observation that falls on Q3
An observation that falls at the lower fence
an observation with a z-score of 2
5
What happens to the mean and st. dev of a data set when each value is converted into a z-score?
The mean will change but the standard deviation will not.
Nothing!
The new mean =1 and the new standard deviation = 0
The new mean =0 and the new standard deviation = 1
6
In a Normal Model, what percent of observations will fall between 1 and 2 std. devs from μ
13.5%
none of these
2.5%
16%
7
The number of accidents at a factory in a given year is ~N(9, 1.48). Find the IQR.
2
1.5
1.75
1
8
If you want the z-score that corresponds to the top 5%, what should you enter into your calc?
invNorm(5)
invNorm(0.05)
invNorm(0.5)
invNorm(0.95)
9
In a Normal Model what percent of observations will fall BEYOND 1 standard deviations from μ?
32%
38%
68%
36%
10
Which z-score is more impressive?
z = -3
z = 3
it depends on the context
