To determine if their $3\mathrm{.}00$

centimeter copper wires are properly adjusted, Duncan & Hall Industries has decided to use an x$$

$-$Chart which uses the range to estimate the variability in the sample.

Table

Control Chart

Step $6$ of $7$: Use the following sample data, taken from the next time period, to determine if the process is $"$In Control" or "Out of Control".

Observations: $3\mathrm{.}02,2\mathrm{.}97,2\mathrm{.}98,2\mathrm{.}95,2\mathrm{.}98$

Sample Mean: $2\mathrm{.}98$