9.1 - 9.3 Stats Review

Front

The most common significance levels are _____ ______.

Back

0.05 and 0.01

Front

Which type of correlation most likely represents the relationship between distance traveled to school and number of shirts owned?

Back

No Correlation

Front

Which type of correlation most likely represents the relationship between number of hours studied for an exam and the grade on the exam?

Back

Positive Correlation

Front

The linear regression equation for the data is y = 1.5x + 12. Predict the cost of a pizza that has 8 toppings.

Back

$24

Front

What is the critical value when n = 15 at 0.01 level of significance?

Back

.641

Front

Define significance level in hypothesis testing.

Back

The significance level (alpha) is the probability of rejecting the null hypothesis when it is true, commonly set at 0.05 or 0.01.

Front

What does a positive correlation indicate?

Back

A positive correlation indicates that as one variable increases, the other variable also tends to increase.

Front

What does a negative correlation indicate?

Back

A negative correlation indicates that as one variable increases, the other variable tends to decrease.

Front

What is the purpose of linear regression?

Back

Linear regression is used to model the relationship between a dependent variable and one or more independent variables.

Front

What is the formula for the slope in a linear regression equation?

Back

The slope (m) is calculated as m = (nΣxy - ΣxΣy) / (nΣx² - (Σx)²).