Which control chart should be used in the following scenarios? (All the charts y

Question

Which control chart should be used in the following scenarios? (All the charts you could use.) Rigor lake might have been polluted by a nearby industrial paint plant. Scientists want to find out what, if any, affect this has had on the car pie fish in the lake. One measure they will use is the number of discolored scales found on each fish. They have recruited sonic marine biology students to help capture and inspect the fish. They plan to inspect 100 fish each day for two weeks. A waste-recycling facility monitors the weights of trucks that enter the facility before they are permitted to tip and unload. Management of the service wishes to reduce the number of trucks that are overweight, so they begin to record the number of overweight trucks over a 4-week time period. The number of truck entering the facility daily and the number of overweight trucks are recorded. An environmental engineer monitors sound level in a building by recording noise levels recorded in dBA units every 15 seconds to determine whether noise levels are within EPA standards. A telecommunications department for a county general services agency is responsible for the repair of equipment used in radio communications by police, fire, and emergency medical services in the county. The timely repair is critically important for the efficient operation these public service units. As such, the repair times for all radios brought in for servicing in a day is collected.

Explanation / Answer

1.) c - chart

Explanation a c-chart is an attribute control chart used with data collected in subgroups. C - chart shows how the process, measured by the number of nonconformities per item, changes over time.

In this question nonconformities are the discolored scales found on each fish. So we use c-chart here.

2.) p - chart

Explanation A p - chart is an attribute control chart used with data collected in subgroups of varying sizes. Because the subgroup size can vary, it shows a proportion on nonconforming items rather than the actual count. Here the overweight trucks will be the proportion of nonconformities i.e defects.

3.) x-bar / R chart

Since in this question there will be data measured after every 15 seconds, so we shall use x-bar / Range chart.

4.) x-bar / s - chart

Since subgroup size can be 11 or more

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