PSYCH 002.Section 1 Quiz

is any group in which a researcher is interested. A population can be large, such as all registered voters in San Joaquin County, or small such as all registered voters at San Joaquin Delta College.

it is a smaller group culled from a population.

scores from a sample.

they summarize and describe data. For example, an average would be a descriptive statistic.

(Descriptive statistics are large numbers with data)

they generalize from a population to a sample (inferring the sample is representative of the population)

the number of individuals or cases; its symbol is f.

indicates the number per hundred who have a certain characteristic; its symbol is P or %.

is a part of one signified by a fraction or decimal.

• N ominal (NAMING)
• O rdinal (ORDERING)
• I nterval (NO ZERO POINT)
• R atio (ZERO POINT)

(NAMING) A word scale of measurement listing by classification e.g. gender, race, age, etc.

(ORDERING) A word scale of measurement listing by some degree of order or ranking e.g. mild, moderate, severe

(NO ZERO POINT) A number scale of measurement noting equal distance with no meaningful zero point e.g. SAT scores from 200-800

(ZERO POINT) A number scale of measurement noting equal distance with a meaningful zero point e.g. weight lost or gained, dollars in pocket

shows how many individuals had each score, either individually or by score intervals

the scores

indicates how many individuals are in and below a given score interval

• Formula:
• start at bottom with lowest score
• add next line up from f
• add from frequency all the way up.
• Top cf should be equal the sum of the f

take f and divide by N

take cf and divide by N

• .075000 = .08 (to the nearest even #)
• .065000 = .06 (to the nearest even #)