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Use the​ table, which gives the total amounts of

Question

Use the​ table, which gives the total amounts of

sales​ (in millions of​ dollars) for​aerobic, basketball,​ cross-training, and walking shoes for the years​ 2005-2011. Determine which type of shoe shows greater​ variation: aerobic or​ cross-training.

Year

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Aerobic

Basketball

​Cross- Training

Walking

2005

271

271

878

1448

1448

3673

2006

272

272

964

1523

1523

4091

2007

292

292

892

1584

1584

4197

2008

252

252

718

1640

1640

4204

2009

225

225

741

2055

2055

4416

2010

253

253

721

2148

2148

4256

2011

256

256

729

2159

2159

4299

Which type of shoe shows greater​ variation: aerobic or​ cross-training?

A.

Aerobic and​ cross-training have equal variances.

B.

Aerobic shows greater variation with a standard deviation of

million dollars.

C.

​Cross-training shows greater variation with a standard deviation of

million dollars.

​(Round to one decimal place as​ needed.)

 
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