At a local county collectors’ meeting, thirteen numismatists presented an average of 12.7 items with a standard deviation of 2.4. Nine philatelists presented an average of 10.9 items each with a standard deviation of 4.6. At the 0.05 level of significance, can a difference in variances be concluded?   What is the critical value?

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At a local county collectors’ meeting, thirteen numismatists presented an average of 12.7 items with a standard deviation of 2.4. Nine philatelists presented an average of 10.9 items each with a standard deviation of 4.6. At the 0.05 level of significance, can a difference in variances be concluded?

 

What is the critical value?

(A) -4.20
B) +3.51
(C) +4.20
(D) +3.51
E
F) -3.51
+ 4.20
Transcribed Image Text:(A) -4.20 B) +3.51 (C) +4.20 (D) +3.51 E F) -3.51 + 4.20
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