Before you start the assignment make sure you know:

$1)$ the difference between sample size and number of samples

$2)$ how to find A$2,$ D$3,$ and D$4($see page $433)$

$3)$ how to compute the Upper and Lower Control Limits for both the X bar and R charts

$4)$ the $6$ conditions that must be met for a process dealing with variables to be in control

This homework assignment is on building the charts we use for variables: X bar and R charts.

We will limit ourselves to the situation where we use R and not sigma. Further, we are building $3-$sigma charts.

Read the chapter, look at the presentations and take the quiz first.

Due date to pass in on paper changed to February $22$nd

Using the attached Excel file:

$1)$ For data set $1$

What are the Upper and Lower Control Limits for both the Xbar and R charts?

Is the process in control?

$2)$ For data set $2$

What are the Upper and Lower Control Limits for both the Xbar and R charts?

Is the process in control?

$3)$ For data set $3$

Assume that there were $9$ observations in each sample

What are the Upper and Lower Control Limits for both the Xbar and R charts?

$4)$ For data set $4$

Assume that there were $10$ observations in each sample

What are the Upper and Lower Control Limits for both the Xbar and R charts?

Is the process in control?