Which Two Factors Are Confounded (Unable to Be Separated) When

question 6

Multiple Choice

Which two factors are confounded (unable to be separated) when measures of computer attitudes made today on a sample of 70-year-olds today are compared with measures of computer attitudes made 10 years ago on a sample of 70-year-olds?

• A)Cohort and time of measurement
• B)Age and cohort
• C)Age and time of measurement
• D)Nothing is confounded in this study

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Definitions:

Sample Mean

The average of all values in a subset of a population, used as an estimate of the population mean.

Population Standard Deviation

The square root of the variance of a group, measuring how far individual measurements in the population deviate from the population mean.

Confidence Intervals

A range of values, derived from sample statistics, that is believed to contain the value of an unknown population parameter with a certain level of confidence.

Prediction Intervals

A prediction of the range within which future results are expected to occur, with a specified level of confidence, based on existing observations.