suppose that a pol taken 10 years ago londthat 59% of parents spark ter dam Supp

Question

suppose that a pol taken 10 years ago londthat 59% of parents spark ter dam Suppo e arecent polof350 aanwendiaerinds hat 100 nkadna nay iprs lo deon capitepatai ad ates la) Assuning parents' attitude toward spaniking has not changed since the original poll, how many of the 350 parents surveyed would be expected to spank ther chidn? The expected amount ot parents surveyed tat would sparther chidmis Round to the nearest whole number as needed (b) Do the results of the survey supgest that parents atude loward spanking may have changed since the oniginal pot? Wh? O A No, 180 is within one standard deviation of the expected amount of adults that spank their chi OB. Nto, 80's rode the vsuar observation rterval ofthes survey O C Yes, 100 is less than the expected amount of aduts that spanik their children O D. Yes 180 is outside the "usua observatio intervfis suvey Click to select your an Type here to search D F Caps Lock

Explanation / Answer

a)from binomial distribution ; expected number of parents to spank their children =np=0.59*350=206.5

b) here std deviation =(np(1-p))1/2 =9.2

as 180 is 2 std deviation below expected value; therefore it is unusual

hence option D is correct

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