# PSYCH 002.Section 1 Quiz

 What is a population? 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. What is a sample? it is a smaller group culled from a population. What is a statistic? scores from a sample. Descriptive statistics do what? they summarize and describe data. For example, an average would be a descriptive statistic. (Descriptive statistics are large numbers with data) Inferential statistics do what? they generalize from a population to a sample (inferring the sample is representative of the population) What is a frequency? the number of individuals or cases; its symbol is f. What is a percentage? indicates the number per hundred who have a certain characteristic; its symbol is P or %. What is a proportion? is a part of one signified by a fraction or decimal. Scales of measurement are? N ominal (NAMING)O rdinal (ORDERING)I nterval (NO ZERO POINT)R atio (ZERO POINT) Nominal is...? (NAMING) A word scale of measurement listing by classification e.g. gender, race, age, etc. Ordinal is..." (ORDERING) A word scale of measurement listing by some degree of order or ranking e.g. mild, moderate, severe Interval is...? (NO ZERO POINT) A number scale of measurement noting equal distance with no meaningful zero point e.g. SAT scores from 200-800 Ratio is...? (ZERO POINT) A number scale of measurement noting equal distance with a meaningful zero point e.g. weight lost or gained, dollars in pocket A frequency distribution ...? shows how many individuals had each score, either individually or by score intervals The symbol X stands for...? the scores A cumulative frequency ...? 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 Formula for percentage is...? take f and divide by N Formula for cumulative percentage...? take cf and divide by N Rounding off numbers are as follows: .075000 = .08 (to the nearest even #).065000 = .06 (to the nearest even #) AuthorNorCalTopaz ID63984 Card SetPSYCH 002.Section 1 Quiz DescriptionSection 1 Quiz Cards Updated2011-02-04T06:51:58Z Show Answers