QUESTION $4$

Refer to the attached Excel file $"$HW Control Charts" using the $"$X$-$Chart" tab data; the UCL and LCL of those samples are:

UCL:$7\mathrm{.}11,$ LCL:$6\mathrm{.}05$

UCL: $6\mathrm{.}11,$ LCL: $6\mathrm{.}05$

UCL:$6\mathrm{.}11,$ LCL:$7\mathrm{.}05$

UCL:$6\mathrm{.}11,$ LCL:$5\mathrm{.}05$

UCL:$5\mathrm{.}11,$ LCL:$6\mathrm{.}05$

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