What do you look for to determine when a process is in a state of statistical control?
a. A control chart with a series of consecutive points that are above the center line and a series of consecutive points that are below the center line.
b. A control chart in which no points fall outside either the upper control limit or the lower control limit and no patterns are present.
c. A control chart in which all the points are exactly the same.
d. All of these choices are true.
Q. 2The Bonferroni adjustment decreases the experimentwise Type I error rate, but it increases the probability of a Type II error.
Indicate whether the statement is true or false
Q. 3The lower and upper control limits of an x control chart are usually set at:
a. one standard error from the centerline.
b. two standard errors from the centerline.
c. three standard errors from the centerline.
d. None of these choices.
Q. 4The Bonferroni adjustment to Fisher's Least Significant Difference (LSD) multiple comparison method is made by dividing the specified experimentwise Type I error rate by the number of pairs of population means.
Indicate whether the statement is true or false
Q. 5When the x control chart shows a change in the mean of the process distribution, the result is referred to as:
a. a trend. c. a level shift.
b. a cycle. d. instability.
Q. 6If we square the t-statistic for two means, the result is the ____________________-statistic.
Indicate whether the statement is true or false
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