Module 2 lab3

Question 1

Correlation Analysis

Answer 1

both independent variables are continuous

Question 2

Continuous variable

Answer 2

infinite number of possible values
(human height and weight)

Question 3

null hypothesis

Answer 3

no relationship exists between variables

Question 4

Alternative hypothesis

Answer 4

values of the dependent variable are caused by the independent variable
(real explainable relationship between the two)

Question 5

p-value

Answer 5

probability that the null hypothesis is correct (there is no relationship)

Question 6

As the P-value gets higher

Answer 6

There is a greater and greater chance of the null hypothesis being correct

Question 7

R^2 value

Answer 7

tells you how much of the variance(fluctuation) in the dependent variable(y) is due to the effect of the independent variable

Question 8

The larger the R^2

Answer 8

the more the variation in the dependent variable is explained by the independent variable

Question 9

R^2 value near zero

Answer 9

there is a random, nonlinear relationship between the two variables

Question 10

trendline

Answer 10

represents any trend in the data

Question 11

the R^2 value measures

Answer 11

how well the trendline represents the data

Question 12

High R^2(close to 1)

Answer 12

• data points are closely aligned with trendline
• independent variable explains a significant proportion of the variation in the dependent variable

Question 13

Moderate R^2

Answer 13

• data points are more dispersed around the trendline
• independent variable explains some of the variation in the dependent variable

Question 14

Low R^2

Answer 14

• data points are widely scattered around the trendline
• independent variable explains a little, but not much, of the variation in the dependent variable
• can still be significant