Q3  Control Charts

Your local cell phone company records how mani milliseconds for each cell phone to connect

to the tower when a call is made.  You randomly selected a sample of cell phone connection times

times in order to determine if the connection times are in control are not.

Below are the connection times of different phone calls that were randomly selected.

Questions:  Both tell you answer and explain/justify it.

a) Are the connection times normally distributed?  

b) How many values are outliers?  

c) Is the connection time in control or out of control?  Explain

d) What are the business implications of your answer to question d?  

e) Given the business implications, what concrete business recommendations do you have

for the company?  

#  Data

1   60

2   184

3   127

4   206

5   133

6 174

7 86

8 34

9 151

10 147

11 149

12 220

13 132

14 168

15 202

16 158

17 101

18 177

19 172

20 196

21 137

22 211

23 171

24 128

25 226

26 149

27 172

28 212

29 105

30 128

31 196

32 181