Which graph shows the strongest positive correlation?
4 points
4
Question 2
2.
Use the picture of the graphs below:
Which graph shows the weakest negative correlation?
(weakest correlation in the negative direction)
4 points
4
Question 3
3.
Use the picture of the graphs below:
Match the graph number with the corresponding correlation coefficient.
Draggable item
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Corresponding Item
2
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0.67
# Not Used
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-0.45
3
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0.01
4
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-0.75
1
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0.91
4 points
4
Question 4
4.
What type of graph should you check to determine if it is appropriate to find the correlation coefficient for a set of data?
4 points
4
Question 5
5.
When deciding if a set of data is appropriate for calculating the correlation coefficient,
what are the three conditions that need to be met?
4 points
4
Question 6
6.
One of the following data sets is NOT or LESS appropriate for finding the correlation coefficient.
Enter the data into L1 and L2.
Create the appropriate plot.
Describe the association between Age and Height for Group A:
Select three correct answers.
4 points
4
Question 7
7.
One of the following data sets is NOT or LESS appropriate for finding the correlation coefficient.
Enter the data for Set B into L3 and L4, create the appropriate plot.
You will need to change the xlist and ylist, use: '2nd, stat' to select the correct lists for the plot.
Describe the association between Age and Height for Group B:
Select three correct answers.
4 points
4
Question 8
8.
One of the following data sets is NOT or LESS appropriate for finding the correlation coefficient.
1. For which set of data is it NOT appropriate (least appropriate) to calculate the correlation coefficient?
2. Explain why.
4 points
4
Question 9
9.
One of the following data sets is NOT or LESS appropriate for finding the correlation coefficient.
For the data set in which it IS APPROPRIATE to calculate and interpret the correlatin coefficient, do the calculation and enter the value below.
Round your answer to three places past the decimal.
4 points
4
Question 10
10.
Fuel Economy 2010: Here are advertised horsepower ratings and expected gas mileage for several 2010 vehicles.
Clear lists 1 & 2 (hover cursor over the list name, 'clear' 'enter').
Enter the data into L1 & L2.
Before you create the plot, which variable will you use for the explanatory variable?
Why?
4 points
4
Question 11
11.
Fuel Economy 2010: Here are advertised horsepower ratings and expected gas mileage for several 2010 vehicles.
Your data is in L1 and L2, before you create the plot,
Which variable will you use for the response variable?
Why?
4 points
4
Question 12
12.
Fuel Economy 2010: Here are advertised horsepower ratings and expected gas mileage for several 2010 vehicles.
Your data is in L1 and L2, create the plot, sketch it in the 'show your work' section.
Be sure to label the x and y axis.
Use the thick line tool to enter the dots.
4 points
4
Question 13
13.
Fuel Economy 2010: Here are advertised horsepower ratings and expected gas mileage for several 2010 vehicles.
Check if it is appropriate to calculate the correlation coefficient.
Your data is in L1 and L2, you have created the scatter plot in #12,
is it appropriate to calculate and interpret the correlation coefficient?
Why or why not?
4 points
4
Question 14
14.
Fuel Economy 2010: Here are advertised horsepower ratings and expected gas mileage for several 2010 vehicles.
Use the scatter plot created in #11, describe the association between HP and MPG:
(Use direction, form and strength)
4 points
4
Question 15
15.
Fuel Economy 2010: Here are advertised horsepower ratings and expected gas mileage for several 2010 vehicles.
Interpret the relationship between HP and MPG:
(As.... increases, ....)
4 points
4
Question 16
16.
Fuel Economy 2010: Here are advertised horsepower ratings and expected gas mileage for several 2010 vehicles.
Calculate the correlation coefficient:
Stat, Calc, you select the function we use.
Round to three places past the decimal.
0 points
0
Question 17
17.
Fuel Economy 2010: Here are advertised horsepower ratings and expected gas mileage for several 2010 vehicles.
Does your analysis prove that horsepower causes lower miles per gallon?
Explain.
4 points
4
Question 18
18.
What does a correlation coefficient measure?
4 points
4
Question 19
19.
After conducting a survey at a pet store to determine the impact of having a pet on the condition of the yard, a news reporter stated: 'There appears to be a strong correlation between having a pet and the condition of the yard.'
Comment on this statement, is it correct?
Think about our discussions in class.
Hint: what does a correlation measure? What are the conditions we check before calculating the correlation coefficient?
Explain below.
6 points
6
Question 20
20.
Use the line color/thickness tool to sketch scatterplots with the given descriptions:
4 points
4
Question 21
21.
Researches investigating the association between the size and strength of muscles measured the forearm circumference (in inches) of 20 teenage boys. Then they measured the boys' grip strength (in pounds). The data is shown in the scatterplot:
Estimate the correlation coefficient, which value from the list is the most reasonable for the data?
4 points
4
Question 22
22.
Researches investigating the association between the size and strength of muscles measured the forearm circumference (in inches) of 20 teenage boys. Then they measured the boys' grip strength (in pounds). The data is shown in the scatterplot:
If the point in the lower right corner (at about 14", 38 lb) were removed, what would happen to the correlation coefficient?