The following sample information was obtained by taking four doughnuts per hour for twelve hours from Fawcett Bakerys doughnut process and weighing them:

Hour	grms	grms	grms	grms
1	110	105	98	100
2	79	102	100	104
3	100	102	100	96
4	94	98	99	101
5	98	104	97	100
6	104	97	99	100
7	89	102	101	99
8	100	101	98	96
9	98	95	101	100
10	99	100	97	102
11	102	97	100	101
12	98	100	100	97

For the data shown above,

1. Find the X bar and R for each sample.

2. Find the Double X bar and R bar for the twelve samples.

3. Find the three-sigma UCL and LCL for the mean and range charts.

4. Plot the data. Does the process look to be in statistical control? Why/why not?