All cars can be classified into one of four​ groups: the​ subcompact,

the​ compact, the​ midsize, and the​ full-size. There are five cars in each group. Head injury data​ (in hic) for the dummies in the​ driver’s seat are listed below. Use a 0.05 significance level. Find the​ P-value to test the null hypothesis that the different weight categories have the same mean.
Subcompact: 681 528 917 898 420
​Compact:      643 655 542 514 525
​Midsize:        469 727 525 454 359
​Full-size:       384 656 602 687 360

what is the P-value?

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