Replacement Times for TV Sets Are Normally Distributed with a Mean

question 132

Multiple Choice

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years, (based on data from "Getting Things Fixed, "Consumer Reports) . (i) The replacement time that separated the top 20% from the bottom 80% is 9.124 years.
(ii. The probability that a randomly selected TV will be replaced after more than 10.0 years is 0.0505.

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

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Definitions:

Depressive Symptoms

Manifestations of depression which can include feelings of sadness, hopelessness, loss of interest in activities, and changes in appetite or sleep.

Cross-Sectional Group

A research method that involves analyzing data from a population, or a representative subset, at a particular point in time.

Statistically Significant

A term denoting that the likelihood that a relationship between two or more variables is caused by something other than random chance is high enough to be considered notable.

Independent Variable

In research, an independent variable is the variable that is manipulated or controlled by the researcher to study its effect on a dependent variable.