Question

a. Name measures of spread or variability.

b. Explain the concept of error and uncertainty as it relates to decision making.

c. What are the formulas to calculate the ?̅2 (adjusted R square)?

Answer 1

## a) Name measure of spread or variability .

Answer : Dispersion also called variability ,scatter or spread is the extent to which a distribution is stretched

its common examples are the variance , standard deviation and inter quartile range .

## b. Explain the concept of error and uncertainty as it relates to decision making.

Answer : In situation where the current state of knowledge is such that

1) the order or nature of things is unknown

2) the consequences extent or magnitude of circumstances ,conditions or events is unpredictable

and credible probabilities to possible outcomes cannot be assigned Although too much uncertainty is undesirable. manageable uncertainty provides the freedom to make creative decisions.

## c. What are the formulas to calculate the ?̅2 (adjusted R square)?

Answer : it is a statistical measure that represents the proportion of the variance for a dependent variable that's explained by an independent variable or variables in a regression model.

R square value is = (correlation value coefficient) ^2