Flashcards in Midterm Deck (10):

1

## Median calculation

### L + (.5N - Nb /nw)i

2

## Percentile calculation

### Nw(X - L) + (Nb *i) / Ni

3

## X value from a %

### L + (. %N - Nb / nw)i

4

## Properties of variance /SD as a measure of variability

###
Always +

If all the scores are the same these values will be 0

Variance is more sensitive to deviations from the mean, since the values are squared

5

## Stem and leaf

### Combines elements of a histogram, freq distribution, and cum freq that retains more detailed information about the data

6

## Cum freq

### Distribution where the entry for a score value is the sum of all the freqs at that value plus all the scores below it

7

## Validity

### How well a study or measure does what it is supposed to do. It's the extent in which the measurement accurately reflects the conceptual variable being measured

8

## Variance

### The degree of variability in a group of scores, found by squaring the deviations about the mean and dividing by the number of scores in the distribution

9

## Normal distribution characteristics

### Bell-shaped, unimodal, mean mdn and mode all have the same value, theoretical distribution based on a population od infinite # of cases, the tails are asymptotic (never reach 0), symmetrical about the central point having an equal # of cases about and below

10