CCA Chapter 6 Algebra 1 Practice Test

Front

What does a correlation coefficient of r = -0.72 indicate about the relationship between two variables?

Back

There is a negative correlation.

Front

How can the population growth of a city be modeled using an exponential function?

Back

The population can be modeled by P = P0(1 + r)^t, where P0 is the initial population, r is the growth rate, and t is time.

Front

What is the annual percentage increase if a population model is given by P = 6191(1.04)^t?

Back

4% increase per year.

Front

What does a positive association between two variables imply?

Back

As one variable increases, the other variable also increases.

Front

What is the correlation between the length of a running start and the distance of a jump?

Back

Positive: the further you run, the further you jump.

Front

If an adult takes 400 mg of ibuprofen and it decreases by 29% each hour, what is the multiplier for the remaining amount?

Back

0.71 (or 71% of the previous amount remains).

Front

Define correlation in the context of statistics.

Back

Correlation measures the strength and direction of a linear relationship between two variables.

Front

What does a correlation coefficient of r = 0 indicate?

Back

There is no correlation between the two variables.

Front

What is the difference between positive and negative correlation?

Back

Positive correlation means both variables move in the same direction; negative correlation means they move in opposite directions.

Front

How do you interpret a correlation coefficient of r = 0.85?

Back

There is a strong positive correlation between the two variables.