The Manager of a Grocery Store Wants to Determine What

question 8

Short Answer

The manager of a grocery store wants to determine what proportion of people who enter his store are his regular customers. What size sample should he take so that at 97% confidence the margin of error will not be more than 0.1?

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Definitions:

Interrater Reliability

An indicator of reliability that examines the agreement of observations made by two or more raters (judges).

Alternate Forms Reliability

Assessment of reliability by administering two different forms of the same measure to the same individuals at two points in time.

Split-half Reliability

A measure of consistency where a test is divided into two parts and the scores on both halves are compared to assess the test's reliability.

Predictivity

The ability of a model or test to accurately forecast outcomes or behaviors.