Math 1001 Unit Four Exam Review

Front

What is stratified sampling?

Back

Stratified sampling is a method of sampling that involves dividing a population into subgroups (strata) and then taking a random sample from each stratum. This technique ensures that each subgroup is adequately represented in the sample.

Front

If Joe worked 30 hours at a rate of $20 per hour, how much is he expected to earn?

Back

$600

Front

What is a linear regression equation?

Back

A linear regression equation is a mathematical representation of the relationship between two variables, typically in the form y = mx + b, where m is the slope and b is the y-intercept.

Front

How do you find the mode of a set of numbers?

Back

The mode is the number that appears most frequently in a data set. If no number repeats, the data set has no mode.

Front

What does it mean to round a number to the nearest whole number?

Back

Rounding to the nearest whole number means adjusting the number to the closest integer. If the decimal is .5 or higher, round up; if it's less than .5, round down.

Front

What is the purpose of a regression analysis?

Back

Regression analysis is used to determine the relationship between variables and to predict the value of one variable based on the value of another.

Front

What is the difference between a population and a sample?

Back

A population includes all members of a specified group, while a sample is a subset of the population selected for analysis.

Front

What is the significance of the y-intercept in a linear equation?

Back

The y-intercept is the value of y when x is zero. It represents the starting point of the line on a graph.

Front

How do you interpret the results of a linear regression?

Back

The results indicate how well the independent variable(s) predict the dependent variable, including the strength and direction of the relationship.

Front

What is the range of a data set?

Back

The range is the difference between the highest and lowest values in a data set.