The City Square Grocery and Meat Market has a large meat locker in which a constant temperature of approximately 40º F should be maintained. The market manager has decided to construct an R-chart to monitor the temperature inside the locker. The manager had one of the market employees take sample temperature readings randomly five times each day for 20 days in order to gather data for the control chart. Following are the temperature sample observations:

a. Construct an R-chart based on these data using 3σ limits, and plot the 20 sample range values.
b. Does it appear that the temperature is in control according to the criteria established bymanagement?

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Temperature(F) 46.3 48.42.5. 39.6 41.2 40.5 378 36.5 3 40.1 1.3 345 332 3.7 423 41 39.5 37.7 38.6 352 38 40.5 39.1 42.3 40.6 41.7 38.6 43.5 44.6 33.2 38.6 415 40.7 43.1 41.8 40.0 41.6 40.7 39.3 424 41.6 40.8 409 43 447 36.5 37.3 35.3 1.1 42.6 43.5 354 36.1 38.2 40.5 404 39.1 372 416 45.3 42.0 43.1 44.7 39.5 36.4 37.5 36.2 38.9 40.1 40.5 34.3 362 35.1 36.8 39.5 38.2 37.6 34.1 38.7 37.6 0.6 40.3 39.7 412 41.0 34.3 39.1 52 43.7 40.9 42.3 37.6 35.4348 376 39 393 1 376 Samples