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Research Methods exam > Week 4- STATS refresher > Flashcards

Week 4- STATS refresher Flashcards

1
Q

Standard deviation is..
A) square root of variance
B) variance squared

A

A)square root of variance

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2
Q

Standard error is…

A

SD / square root of sample size

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3
Q

variance is..
A) scatter of data set
B) values squared
C) values square rooted

A

A) scatter of data set

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4
Q

sigma squared is…

A

how spread the data is, in relation to the mean

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5
Q

Population variance is..
A) variance of entire population OF INTEREST
B) variance of the sample from population
C) population variance SD
D)None of the above

A

A) variance of entire population OF INTEREST

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6
Q

Sample variance is..
A)variance of population sub set
B) variance of population
C) variance of half the sample

A

A) variance of population sub set

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7
Q 
1st step of sample variance?
A) average values 
B) square root values 
C) square values 
D) divide values by 2
A

A) average values

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8
Q

2ns step of sample variance ..
A) add value to each individual data value
B) times average by each individual data set
C) subtract average value from each individual data set
D) square average by each data set

A

C) subtract average value from each individual data set

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9
Q 
3rd step of sample variance..
A) calculate distance of data point from average 
B) times value by average 
C) square data points 
D) square root distances
A

A) calculate distance of data point from average

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10
Q 
4th set sample variance..
A) square root distances
B) square distance values 
C) add distance values 
D) divide distance values by data set
A

B) square distance values

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11
Q 
5th step of sample variance 
A) divide squared values by number of data points
B) add all the squares (Sum of squares) 
C) square root values then sum 
D) multiply values by 10
A

B) add all the squares (Sum of squares)

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12
Q 
6th step of sample variance..
A) divide sum of squares by 10
B) divide SOS by degrees of freedom (n-1)
C) X SOS by df (n-1)
D) X SOS by 10
A

B) divide SOS by degrees of freedom (n-1)

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13
Q

two tailed test means you can test for an effect in both directions.. (Drug a/b performance effects) TRUE OR FALSE

A

TRUE

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14
Q

one tailed is testing one direction only (DO people perform better on drug A or B) true or false

A

TRUE

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15
Q 
normally distributed (Gaussian distribution is a ...... curve 
A) J 
B) S 
C) Bell 
D) U
A

C) bell

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16
Q 
positively skewed order or mean, medium and mode.
A) Mode median mean 
B) Mean mediam mode
C) median mode mean 
D) media mean mode
A

A) mode, median, mean

17
Q 
negatively skewed order or mean, medium and mode.
A) Mode median mean 
B) Mean mediam mode
C) median mode mean 
D) media mean mode
A

B) Mean mediam mode

18
Q 
Mesokurtic is..
A)normal distribution
B) low distribution 
C) high curve distribution 
D) right distribution
A

A)normal distribution

19
Q

leptokurtic is a high peaked bell curve.. TRUE OR FALSE

A

TRUE

20
Q

Platykurtic has a low and flat bell curve.. true or false

A

true

21
Q

If skewness more twice the standard error skewness, you may have a..
A) normal distribution
B) small standard error
C) Skewed distribution

A

C) Skewed distribution

22
Q

If kurtosis more than twice standard error kurtosis you may have…
A) normal distribution
B) Skewed data (Right)
C) non-normal distribution

A

C) non-normal distribution

23
Q 
Independent samples t test when.. 
A) 2 groups you want to compare
B) group across 2 conditions
C) pre testing only 
D) control groups comparisons only
A

A) 2 groups you want to compare

24
Q 
Paired samples t test when.. 
A) 2 groups you want to compare
B) group across 2 conditions
C) pre testing only 
D) control groups comparisons only
A

B) group across 2 conditions

25
Q

Independent samples equation t=

A

(mean1-mean2)/ Square root of (SEM1squared+SEM2Squared)

26
Q 
If the p value for Levene’s test in > .05 then we can assume..
A)normal data 
B) Homogeneity of variance
C) skewed data 
D) non-normal data
A

B) Homogeneity of variance

27
Q

If the p value for Levene’s test is < .05, then the assumption is..
A) correct
B) Violated
C) use bottom line of output (equal variances not assumed)
D)B,C

A

D)B,C

28
Q

Paired t-test equation..

A

mean of difference between each individual score in each test (d, with line above) / (SD/square root N)

Research Methods exam (9 decks)

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