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Year 12 Standard Maths Bivariate Data Analysis
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Blood pressure levels for women increase as they get older. What is the best description for the association between blood pressure levels and a woman’s age?
1 punto
Positive correlation.
Zero correlation.
Negative correlation.
Constant correlation.
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What is the correlation between the variables in the scatterplot?
1 punto
Strong positive
Strong negative
Weak positive
Weak Negative
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For a set of bivariate data, Pearson’s correlation coefficient is –1. Which graph could best represent this set of bivariate data?
1 punto
A
B
C
D
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The equation of a regression line that enables weekly amount spent on entertainment (indollars) to be predicted from weekly income is given by: amount = 0.10 × income + 40. What is the predicted amount spent on entertainment with a weekly income of $600?
1 punto
$40
$46
$100
$240
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The graph below shows the typing speed for a student. Based on the line of best fit, what would be the approximate typing speed, in words per minute, of a person who has practised for 8 weeks?
1 punto
40
48
62
81
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Some students had their height and foot lengths measured and recorded. The results were graphed and a line of best fit was drawn by four different students as shown. Which of the following shows the most suitable line of best fit?
1 punto
A
B
C
D
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Which of the data sets graphed below has the largest positive correlation coefficient value?
1 punto
A
B
C
D
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What is the value of y predicted by the least-squares regression line y = −0.78x − 5.6 when x = 10?
1 punto
−13.4
−7.2
2.2
7.8
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Which of the following equations is closest to the least-squares scatterplot shown below?
1 punto
y = −0.9x + 8.7
y = −8.7x + 0.9
y = 0.9x − 8.7
y = 8.7x − 0.9
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The scatterplot shows the weights at age 21 and at birth of 12 women.How is this association best described?
1 punto
Weak positive non-linear
Weak negative non-linear
Strong positive linear
Strong negative linear
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