Question

In: Statistics and Probability

The viscosity of a polymer is measured hourly. Measurements for the last 20 hours are shown...

The viscosity of a polymer is measured hourly. Measurements for the last 20 hours are shown as follows:

Test

Viscosity

Test

Viscosity

1

2838

11

3174

2

2785

12

3102

3

3058

13

2762

4

3064

14

2975

5

2996

15

2719

6

2882

16

2861

7

2878

17

2797

8

2920

18

3078

9

3050

19

2964

10

2870

20

2805
  1. Does viscosity follow a normal distribution?
  2. Set up a control chart on viscosity and a moving range chart. Does the process exhibit statistical control?
  3. Estimate the process mean and standard deviation.
  4. The next five measurements on viscosity are 3163, 3199, 3054, 3147, and 3156. Do these measurements indicate that the process is in statistical control?

Solutions

Expert Solution

orchestra answered 3 years ago
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