1. A study is made of the effect of curing temperature on the compressive strength of a certain type of concrete. Five concrete specimens are cured at each of four temperatures, and the compressive strength of each specimen is measured (in MPa). The results are as follows:
Temperature (°C)
Strengths
0
31.2
29.6
30.8
30.0
31.4
10
27.7
31.1
31.3
30.6
20
35.9
36.8
35.0
34.6
36.5
30
38.3
37.0
37.5
36.1
38.4
a. Construct an ANOVA table. You may give a range for the P-value.
b. Can you conclude that the mean strength differs with temperature?
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