1
Which statement about correlation is FALSE?
•
The correlation of a data set can be positive, negative, or 0.
•
Correlation is used to define the variables of only non-linearly related data sets.
•
Correlation be
...
1
Which statement about correlation is FALSE?
•
The correlation of a data set can be positive, negative, or 0.
•
Correlation is used to define the variables of only non-linearly related data sets.
•
Correlation between the variables of the data set can be measured.
•
Correlation is the degree to which the two variables of a data set resemble each other.
2
Which of the following is a guideline for establishing causality?
•
Keep all variables the same to get duplicate results.
•
Do not consider other possible causes.
•
Check if the effect is present or absent when the response variable is present or absent.
•
Look for cases where correlation exists between the variables of a scatterplot.
3
Data for weight (in pounds) and age (in months) of babies is entered into a statistics software package and results in a regression equation of ŷ = 17 + 0.8x.
What is the correct interpretation of the slope if the weight is the response variable and the age is the explanatory variable?
•
The weight of a baby decreases by 0.8 pounds, on average, when the baby's age increases by
1 month.
•
The weight of a baby increases by 0.8 pounds, on average, when the baby's age increases by
1 month.
•
The weight of a baby decreases by 17 pounds, on average, when the baby's age increases by 1
month.
•
The weight of a baby increases by 17 pounds, on average, when the baby's age increases by 1
month.
4
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