PSYCH STATS 101 CH 3-6

Scores of a particular group is called:

Expected relative frequency of an outcome; proportion of successful outcomes to all outcomes.

# O'successful outcomes÷by # O'total outcomes expected 2get if experiment repeated Lg # of x's.

T/F: Normal distribution is the frequency distribution that follows a normal curve.

Undrstand'g O'probabilty: d'proprtion O'particulr outcome rec'vd if d'exprimnt repeatd many x's

A Z score is the raw score minus the mean, divided by the standard deviation.

entire group of people to which a researcher intends the results of a study to apply is called:

Descriptive statistics, e.g; M or SD, figured from the scores in a group of people studied.

Positive Z scores are:

A frequency distribution that follows a normal curve is called:

Term used in discussing probability for the result of an experiment, or almost any event.

A specific, mathematically defined, symmetrical bell-shaped frequency distribution, unimodal is

The raw score is the Z score multiplied by the standard deviation, plus the mean.

A useful working rule for normal curves is that 50% of the scores are above the mean.

Z Scores are:

Way of undrstand'g probabilty as d'egree of one’s certanty that a particulr outcome will occur.

Distributions observed in nature and in research commonly approximate:

Actual value of the mean, SD, and so on, for the population (est. based on info. in samples).

negative Z scores are:

Usually meaning that each person in the population has an equal chance of being chosen:

Who was the expert in chance?

% O'x's assoc.č normal curve/usually incl. % O' x's (∭various #'s of SD & % O' x's more +)↑ d'M