Mathematics Homework Help

1) A person 
receive goods from 2 suppliers. Based on the following record can you
conclude that occurrences  of defects and
the suppliers are independent? alpha=0.5

Type of Defects:

suppliers:  A  B 
C  D  E 
Total

1: 
70  10  10 
30  0  120 

2:  10 
10 20  20  20 
80

Total 
80  20  30 
50  20  200

 

2)A person take
a sample of 3 items of each of four different brands.Can you conclude that the
mean values of all four brands are equal?

 
BRANDS

 
A  B  C 
D

 
20  25 
24  23

 
19  23  20 
20

 
21  21  22 
20