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Te x St x ro x × fir x Secure https://www.math d con Student Plaver estas x car as assignment points possible 250 ext outcomes tool placement url=http e.com%2fapi%2flti%2fv1962fturritin a Statistics to Dsion-Making Christopher Umali R/76,'17 6:06 PM Quiz: Final Exam Time Remaining: 01:30:36 Submit Quiz This Question: 8 pts 21 of 31 (20 corrpk1c) This Quiz: 250 pts posslble A dor or wants estimate he HN chnie ern nra 20-to 2A- ear-old man, How many Sil n ts re noen d n estimate ne D estr 1 w hin 2 por swith 9 bconfin iming = 5 ? Sun r e te non rw ou he r rnt w h hcann nrn How dne he dr re re as e n corifidere ecl he sample size required? A90% conhdence level requires Jubects (Round up to the narest wholz number as nocdod ) A 95% curfidence leve requires-1 subjects (Round up to the nearest whole number 3e needed.) How doos the deacain condencc atfoct the sampc szc rcquirca? A. Themple sire is the same for all lens of rnmdene ( B. I he onertne cont dence level the smaller the samole size. Cick to select your answers Type, here to search 8/26/2017

Explanation / Answer

for 99% CI:

z=2.5758

margin of error E =2

and std deviaiton =15.7

therefore required sample size n =(z*std deviation/E)2 =409

for 95% CI;

z=1.96

therefore required sample size n =(z*std deviation/E)2 =237

as sample size reequirmetn decreases; option B is correct

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