The article " The Ball-on-Three-Ball Test for Tensile Strength: Refined Methodology and Results for Three Hohokam Ceramic Types" (M. Beck, American Antiquity, 2002:558-569) discusses the strength of ancient ceramics. Several specimens of each of three types of ceramic were tested. The loads (in kg) required to crack the specimens are as follows:
Ceramic Type Loads (kg)
Sacaton 15 30 51 20 17 19 20
|
|
32
|
17
|
15
|
23
|
19
|
15
|
18
|
|
16
|
22
|
29
|
15
|
13
|
15
|
|
|
Gila Plain
|
27
|
18
|
28
|
25
|
55
|
21
|
18
|
|
|
34
|
23
|
30
|
20
|
30
|
31
|
25
|
|
|
28
|
26
|
17
|
19
|
16
|
24
|
19
|
|
|
9
|
31
|
19
|
27
|
20
|
43
|
15
|
|
Casa Grande
|
20
|
16
|
20
|
36
|
27
|
35
|
66
|
|
|
15
|
18
|
24
|
21
|
30
|
20
|
24
|
a. If a histogram for speeds of vehicles through intersection A were drawn, do you think it would be skewed to the left, skewed to the right, or approximately symmetric? Explain.
b. If a histogram for speeds of vehicles through intersection B were drawn, do you think it would be skewed to the left, skewed to the right, or approximately symmetric? Explain.