UNITED STATES INTERNATIONAL UNIVERSITY-AFRICA
MTH2210: INTRODUCTION TO APPLIED STATISTICS
SPRING 2019
GROUP ASSIGNMENT 2
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1. For the graphs below, indicate whether the two variables graphed display a positive,
negative or no relationship between their values.
2. The table below shows the hearing test scores of people of different ages:
(a)
Age
55.0
Hearing test score
2.5
40.0
3.8
35.0
4.0
30.0
3.9
42.0
2.5
48.0
3.2
50.0
2.2
48.0
1.8
32.0
3.0
45.0
2.0
30.0
4.0
56.0
1.8
Which is the independent variable (to be plotted on the x-axis)?
(b) Construct a scatterplot showing hearing test score against age.
(c)
Compute the correlation coefficient between the variables.
(d) What conclusion would you make from your findings in (b) and (c)
(e) Determine the least squares regression line of test scores on age and use it to estimate the
test score for an individual who is 47 years of age
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