Stats Ch. 6

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22 Terms

1
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Random variable

Takes numerical values that describe the outcomes of some chance process.

2
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Dividing and multiplying a random variable by a constant changes the shape of the distribution.

False. It does not.

3
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Adding or subtracting a constant from a variable…

Adds to measures of center and location. Does not change measures of spread or shape of distribution

4
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Probability distribution of Y has same shape as probability distribution of X.

True

5
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Mean of Sum of Random Variables

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6
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Variance of Sum of Random Variables

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7
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Mean of difference of variables is their difference BUT…

order of subtraction is important

8
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binomial

“success” or “failure” in fixed number of trials

9
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binomial settings conditions

Binary, Independent, Number, Success

10
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p in binomial distribution

probability of success in any one trial

11
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binomial probability formula

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12
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binompdf

use with specific number

13
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binomcdf

find number greater or less than in a trial

14
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mean of binomial random variable

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15
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standard deviation of binomial random variable

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16
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geometric setting

when we perform independent trials of the same chance process and record the number of trials it takes to get one success.

17
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Probability of success in each geometric trial must be the same

True

18
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geometric random variable

Y = number of trials needed to get first success

19
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geometric distribution

probability distribution of geometric random variable

20
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Formula of geometric probability

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21
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Formula for variance of geometric probability

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22
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Formula for mean of geometric probability

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