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15 Cards in this Set
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what increases statistical power?

 increased alpha value
 decrease variance  increased effect size  increased sample size 

statistical power is increased in what circumstances?
A. decreased alpha B. increase variability C. increased sample size D. decreased treament effect 
C. increased sample size


which one is more affected by extreme numbers?
A. mean B. median 
MEAN


with a normal distribution when the SD is very small what is the appearance of the frequency distribution?
A. tall and skinny B.short and fat C. bimodal D. mean to left of median 
A. tall and skinny (short and fat would be large SD)


when viewing a positively skewed frequency distribution what is the relationship between mean and median?
A. the mean is less than the median B. the mean is greater than the median C. the mean is located to the left of the median 
B. the mean is greater than the median (think positive= mean is higher +)


Ho states that there is?

no difference between two groups. Ha= a difference exists


if P. value is 0.08 we?
A. accept the null hypothesis B. reject the null hypothesis C. the result is statistically significant? 
A. accept the null hypothesis (= no difference P.value>alpha)


we always assume the null hypothesis to be true?

true


what is a type 1 error?

when u reject the Ho (i.e saying there is a difference) but no true difference actually does exist


what is the type 2 error?

when you accept Ho (i.e saying there is no difference) but a difference actually exists


the probability of commiting a type two error?

beta


wat is statistical power?

the probability of finding a statistically significant difference if one exists in the real world


what is statistical power?

when the results are unlikely to have occured by chance


clinical importance?

is the result meaningful to the patient


what determines if result is statistically significant?

if pvalue < alpha = significant and if does not have zero in CI.if zero included i.e 1.24.2 = not stat significant
