Psych Exam 2

A distribution has a mean of 60.0 and a standard deviation of 4.3. The raw score corresponding to a z score of 0.00 is

d. 60.0

In a negative relationship,

d. as X increases, Y decreases

If a distribution of raw scores is negatively skewed, transforming the raw scores into z scores will result in a _______ distribution.

d. negatively skewed

In the equation Y=bX + a, X and Y are

d. variables

After several studies, Professor Smith concludes that there is a zero correlation between body

...

In anormal curve, the inflection points occur at

a. u +/- 1sigma

The z score corresponding to the mean of a raw score distribution equals

b. 0

The proportion of scores less than z=0.00 is

b. 0.50

The standard deviation of the z distribution equals

b. 1 c. the variance of the z distribution

A scatter plot

b. is a graph of paired X and Y values

You have just received your psychology exam grade and you did better than the mean of the exam scores. If so, the z transformed value of your grade must

b. must be greater than 0.00 c. have a percentile rank greater than 50% e. must be greater than 0.00 and have a percentile rank greater than 50%

It is possible to compute a coefficient of correlation if one is given

b. two sets of measurements on the same individuals

In a normal distribution approximately ______ of the scores will fall within 1 standard deviation of the mean

c. 70%

The normal curve is

c. bell-shaped