Unit 1 90-93 (96)

Question 1

Positive (right) skew

Answer 1

When a distribution has a few extreme scores toward the high end relative to the low end

Question 2

Negative (left) skew

Answer 2

A left-skewed distribution is longer on the left side of its peak than on its right

Question 3

Bimodal distribution

Answer 3

A set of scores with two peaks or modes around which values tend to cluster, such that the frequencies at first increase and then decrease around each peak

Question 4

Spurious correlation

Answer 4

variables are associated through their common relationship with one or more other variables but do not have a casual relationship with one another

Question 5

R-values

Answer 5

Represent correlations between 2 numerical variables. The value of R is always between +1 and -1

Question 6

P-values

Answer 6

In statistical significance testing, the likelihood that the observed result would have been obtained if the null hypothesis of no real effect were true. Small “P” values (conventionally, those less than .05 or .01) suggest that the chance of experimental results mistakenly being attributed to the independent variables present in the study (rather than to the random factors actually responsible is small