Making a Scatterplot
Ch 7 – Class Activity
Name__________________________
Does the age at which a child begins to talk predict a later score on a test of mental ability? A
study of the development of young children recorded the age in months at which each of 21
children spoke their first word. And their Gesell Adaptive Score, the result of an aptitude test
taken much later. The data appear in the table below.
Age (months) at First Word and Gesell Score
Age
15
26
10
9
15
20
18
Score
95
71
83
91
102
87
93
Age
11
8
20
7
9
10
11
Score
100
104
94
113
96
83
84
Age
11
10
12
42
17
11
10
1. Create a Scatter Plot. Make sure to scale and label your axes properly.
Score
102
100
105
57
124
86
100
2. Describe in sentences the relationship in terms of the data.
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3. Calculate the correlation coefficient.
4. Do you think age of first word is a good predictor of future mental aptitude? Explain?
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