Use the following data for problems 10-12: Crusty’s pizza company records the number of complaints they receive on their pizzas each day. The last twenty days are in the table below.
Day |
Complaints |
Day |
Complaints |
1 |
6 |
11 |
12 |
2 |
1 |
12 |
5 |
3 |
4 |
13 |
2 |
4 |
4 |
14 |
8 |
5 |
9 |
15 |
1 |
6 |
2 |
16 |
4 |
7 |
12 |
17 |
14 |
8 |
5 |
18 |
18 |
9 |
9 |
19 |
12 |
10 |
2 |
20 |
7 |
ans )mean (u) = 195 minutes
standard deviation = 15 min/
P(x = 178)= )
P(x = 178) = =0.12
option D is true
ans )special cause of variation are
There are 9 consecutive points within the control limits going up
A point is above the upper control limit
There are 8 consecutive points below the center line and above the lower control limit
option E is correct
ans) since mean of the data is 6.85 and standard deviation 4.9
The upper control limit for the number of complaints is 11.54 option B is correct
ans )the process is out of control because some points lies outside the ucl and lcl
option A is correct
ans )The center line for the number of complaints is 6.85 option D is correct
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