Week 4- STATS refresher Flashcards
Standard deviation is..
A) square root of variance
B) variance squared
A)square root of variance
Standard error is…
SD / square root of sample size
variance is..
A) scatter of data set
B) values squared
C) values square rooted
A) scatter of data set
sigma squared is…
how spread the data is, in relation to the mean
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) variance of entire population OF INTEREST
Sample variance is..
A)variance of population sub set
B) variance of population
C) variance of half the sample
A) variance of population sub set
1st step of sample variance? A) average values B) square root values C) square values D) divide values by 2
A) average values
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
C) subtract average value from each individual data set
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) calculate distance of data point from average
4th set sample variance.. A) square root distances B) square distance values C) add distance values D) divide distance values by data set
B) square distance values
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
B) add all the squares (Sum of squares)
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
B) divide SOS by degrees of freedom (n-1)
two tailed test means you can test for an effect in both directions.. (Drug a/b performance effects) TRUE OR FALSE
TRUE
one tailed is testing one direction only (DO people perform better on drug A or B) true or false
TRUE
normally distributed (Gaussian distribution is a ...... curve A) J B) S C) Bell D) U
C) bell
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) mode, median, mean
negatively skewed order or mean, medium and mode. A) Mode median mean B) Mean mediam mode C) median mode mean D) media mean mode
B) Mean mediam mode
Mesokurtic is.. A)normal distribution B) low distribution C) high curve distribution D) right distribution
A)normal distribution
leptokurtic is a high peaked bell curve.. TRUE OR FALSE
TRUE
Platykurtic has a low and flat bell curve.. true or false
true
If skewness more twice the standard error skewness, you may have a..
A) normal distribution
B) small standard error
C) Skewed distribution
C) Skewed distribution
If kurtosis more than twice standard error kurtosis you may have…
A) normal distribution
B) Skewed data (Right)
C) non-normal distribution
C) non-normal distribution
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) 2 groups you want to compare
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
B) group across 2 conditions
Independent samples equation t=
(mean1-mean2)/ Square root of (SEM1squared+SEM2Squared)
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
B) Homogeneity of variance
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
D)B,C
Paired t-test equation..
mean of difference between each individual score in each test (d, with line above) / (SD/square root N)
