25 Standard scores and norm curve

Question 1

allow for comparing diff sets of msmts

Answer 1

standard distr

Question 2

represents how many standard deviations a raw score is above or below mean

Answer 2

z scores

Question 3

many variables in health sciences distr like this

Answer 3

normal

Question 4

for variable x on interval/ratio scale, normal curve has these charcteristics:

Answer 4

1) symmetrical about mean and mean=median=mode 2) most cases close to mean, relatively few at high or low x 3) follows equation detremined by Gauss

Question 5

for difff variables, ____ form is same but ____ differ

Answer 5

math (curve); mean value and variation

Question 6

this curve transforms raw scores of variable into z scores and plot as frequency polygon, removes diffs in means and SDs so is identical for any variable

Answer 6

standard normal curve

Question 7

characteristics of stand. norm curve?

Answer 7

1) mean is 0 2) mean-median=mode 3) SD of z scores is 1 4) assumed toal area under curve adds up to 1 5) can use stats tables to estimate area under stand norm curve for any given z score 6) can use stand norm curve to calc % scores between any two scores

Question 8

allow reverse, to determine raw score from particular area under norm curve

Answer 8

critical values

Question 9

how to calc critical values?

Answer 9

z = (x - mu ) / SD –> x = (SD*z) + mu

Question 10

standard normal curves can be used to compare ____

Answer 10

scores from diff distr