(I If There Is Absolutely No Chance a Person Will

question 86

Multiple Choice

(i. If there is absolutely no chance a person will purchase a new car this year, the probability assigned to this event is zero. (ii) If the set of events are collectively exhaustive and mutually exclusive, the sum of the probabilities equals 0.
(iii) Suppose four heads did appear face up on the toss of a coin four times. The probability that a head will appear face up in the next toss of the coin is 1/2 or 0.5.

• A) (i), (ii) and (iii) are all correct statements
• B) (i) is a correct statement but not (ii) or (iii).
• C) (i) and, (iii) are correct statements but not (ii).
• D) (ii) and, (iii) are correct statements but not (i).
• E) (i), (ii) and (iii) are all false statements.

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Definitions:

Significance Level

A threshold chosen by the researcher to determine the cutoff at which an observed test statistic is considered statistically significant.

Slope

The rate of change in the y-variable per unit change in the x-variable in a linear equation; measures the steepness of a line.

Regression Line

A straight line that best approximates the relationship between two variables in regression analysis, indicating the expected value of the dependent variable for a given value of the independent variable.

Confidence Interval

A range of values, derived from sample statistics, that is likely to contain the value of an unknown population parameter.