Data tool

Data (12 rows)

#	Column 1 name	Column 2 name
1	Hours studied, row 1	Math score, row 1
2	Hours studied, row 2	Math score, row 2
3	Hours studied, row 3	Math score, row 3
4	Hours studied, row 4	Math score, row 4
5	Hours studied, row 5	Math score, row 5
6	Hours studied, row 6	Math score, row 6
7	Hours studied, row 7	Math score, row 7
8	Hours studied, row 8	Math score, row 8
9	Hours studied, row 9	Math score, row 9
10	Hours studied, row 10	Math score, row 10
11	Hours studied, row 11	Math score, row 11
12	Hours studied, row 12	Math score, row 12

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Sample (n − 1)

Class width

0 = suggested (5)

Class interval	Frequency	Relative	Cumulative
60 – <65	1	8.3%	1
65 – <70	1	8.3%	2
70 – <75	2	16.7%	4
75 – <80	2	16.7%	6
80 – <85	1	8.3%	7
85 – <90	2	16.7%	9
90 – 95	3	25.0%	12

Chart

x column

y column

Drag to pan, pinch or scroll to zoom, tap to trace. Keyboard: arrows, + / −, Home. x: -0.05 to 9.05 · y: 0 to 99.95

\hat{y} = 4.699x + 60.198 \qquad r = 0.98 \qquad r^2 = 0.96

12 points; very strong positive correlation. Correlation is not causation: ask what else could explain the pattern.