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1

Hypothesis test

________ for matched or paired samples: subjects are matched in pairs and differences are calculated.

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2

S1

________ and s2: the sample standard deviations, are estimates of σ1 and σ2, respectively.

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3

Pc

________ or Pooled proportion: estimate of the common value of p1 and p2.

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4

measurements

Two ________ (samples) are drawn from the same pair of individuals or objects.

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5

Standard deviation

________: A number that is equal to the square root of the variance and measures how far data values are from their mean.

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6

t distribution

Distribution: Student's ________ with degrees of freedom (variances not pooled)

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7

Random Variable

________: X¯1−X¯2= the difference of the sampling means.

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8

Aspin Welch t test

________: The test comparing two independent population means with unknown and possibly unequal population standard deviations.

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9

independent samples

The two ________ are simple random samples from two distinct populations.

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10

Random Variable

X¯1−X¯2 = the difference of the sampling means

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11

Distribution

Student's t-distribution with degrees of freedom (variances not pooled)

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12

Standard deviation

A number that is equal to the square root of the variance and measures how far data values are from their mean

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13

s

sample standard deviation

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14

σ

population standard deviation

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15

Aspin-Welch t-test

The test comparing two independent population means with unknown and possibly unequal population standard deviations

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16

s1 and s2

the sample standard deviations, are estimates of σ1 and σ2, respectively

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17

σ1 and σ2

the unknown population standard deviations

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18

𝑥⎯⎯1x¯1 and 𝑥⎯⎯2x¯2

the sample means

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19

μ1 and μ2

the population means

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20

n1 + n2 > 30

you can use the normal distribution to approximate the Student's t

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21

Cohen's Standards for Small, Medium, and Large Effect SizesCohen's d

measure of effect size based on the differences between two means

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22

Pc or Pooled proportion

estimate of the common value of p1 and p2

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23

Null hypothesis

Pa = Pb

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24

Hypothesis test for matched or paired samples

subjects are matched in pairs and differences are calculated

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25

Degrees of freedom

n-1

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