Utilize Microsoft Excel to create an X-bar and R chart to capture the variation in the sample means of the battery life data set from the table below. Is this in control? Why or why not?

	Sample 1	Sample 2	Sample 3	Sample 4
Test 1	22	24	28	27
Test 2	24	16	29	25
Test 3	29	16	29	13
Test 4	29	28	18	15
Test 5	27	26	19	20
Test 6	20	26	18	16
Test 7	24	15	20	23
Test 8	19	16	13	22
Test 9	13	20	23	26
Test 10	18	17	26	23
Test 11	29	14	18	26
Test 12	21	13	17	22
Test 13	19	22	17	22
Test 14	15	24	15	29
Test 15	17	19	22	29
Test 16	26	21	16	26
Test 17	15	23	29	19
Test 18	18	16	29	21
Test 19	24	26	28	20
Test 20	29	13	29	24
Test 21	25	13	29	15
Test 22	24	22	20	21
Test 23	13	29	18	28
Test 24	27	26	14	29
Test 25	21	19	26	25