A company that produces juice drinks in cans with a net 350 ml. Wanted to evaluate the results of the drink. So that one sample is taken every day for one month (30 days) and the net measurement of the samples taken is taken. The data is random, if the data is normally distributed with an average of 348.5 ml and a standard deviation of 2.5 ml.
a. Based on these data, create a cusum control chart manually and evaluate whether the process is statistically controlled.
b. Evaluate the process control on the net beverage cans using the EWMA control chart manually. Use values ​​of 0.2, 0.5 and 0.9. Interpret the results.