Please help! It would be greatly appreciated! Make a decision about the given cl

Question

Please help! It would be greatly appreciated!

Make a decision about the given claim. Do not use any formal procedures and exact calculations. Use only the rare event rule Claim: A coin favors heads when tossed, and there are 8 heads in 18 tosses. Which of the following is correct? 0 A. O B. O C. 0 D. There is not sufficient evidence to support the claim because there are substantially more heads than tails There is not sufficient evidence to support the claim because there are not substantially more heads than tails. There does appear to be sufficient evidence to support the claim because there are not substantially more heads than tails. There does appear to be sufficient evidence to support the claim because there are substantially more heads than tails

Explanation / Answer

n=18

p=0.5

mean= np=18*0.5=9

standard deviation=sigma=sqrt(np*(1-p)=sqrt(18*0.5*(1-0.5))=2.1213

Range rule of thumb

usual values will fall between lower bound= mean-2*sd=9-2*2.1213=4.7574

upper bound=mean+2sd=9+2*2.1213=13.2426

any value fall outside will be unusual as 8 head or of 18 tosses are fall in this range

B ) there is no sufficent evidence to support the claim because there is not substantially more head than tails.

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