Stats #3

which of the following is the weakest correlation? -.90, -.15, 0.50, 0.78

-.15

A correlation can range from __ to __.

-1 to 1

if the coefficient of determination is .25, what is the pearson correlation coefficient?

0.50

which is not a possible correlation between exam scores and GPA? -0.10, 0.90, 0.25, 1.25

1.25

If the highest exam score is 20 an the range is 5, whats the lowest score?

15

If the variance is 9, the standard deviation is ___.

3

if the correlation coefficient is -.25, what % variance is shared

6.25%

If the variance for a dataset is 49, what is the standard deviation?

7

What is the range for the data set below? 2, 5, 7, 1, 9, 4, 4, 8, 6, 1

8

The range is:

A subtraction of the lowest score from the highest score.The least informative measure of spread.Sensitive to outliers

A ___ correlation means the variables involved change in the same direction.

Direct

A correlation close to -1 is a weak correlation.

False

Perfect correlations (rare in psychology) are represented by a curvilinear line on a graph.

False

The larger the standard deviation, the closer together the data points in the distribution are from the mean.

False

The sign of a correlation coefficient determines the strength of the correlation.

False

The coefficient of determination is:

Is more precise than looking at the correlation coefficient the percentage of variance in one variable that is accounted for by the variance in another Is a measure of shared variance

A correlation of zero between two variables means the variables are ___.

Not related

The standard deviation is calculated by:

Taking the square root of the variance

rxy represents:

The correlation coefficient

The standard deviation is very sensitive to outliers.

True

Which statement is true regarding variability?

Variability between conditions related to the IV is good

S2 is the symbol for ___.

Variance

the lower your exam scores, the greater amount of tears your instructor sheds

example of negative correlation.

we found a correlation of .99 between hours studying and exam scores, what does this mean

theres a positive relation between studying and exam scores.