Statistics
posted by Jen
Can someone please help me answer these questions? I have tried every method I know and the computer still keeps marking the answers as incorrect. Thanks for the help!
1) If the number of 1834 year olds sampled is equal to the value identified in part "a"(value=157), what is the standard deviation of the percentage that uses an online tax program (to 2 decimals)? [the percentage given of all 1834 year olds who use online tax program was 16%]
2) If the number of 3544 year olds sampled is equal to the value identified in part "b" (value=209, what is the standard deviation of the percentage that uses an online tax program(to 2 decimals)? [the percentage given of all 3544 year olds who use online tax program was 12%)

MathGuru
Standard deviation = √npq
1) n = 157
p = .16 (for 16%)
q = 1  p = 1  .16 = .84
2) n = 209
p = .12 (for 12%)
q = 1  p = 1  .12 = .88
Substitute and calculate. 
Anonymous
c. How many 65+ year olds must be sampled to find an expected number of at least 25 that use an online tax program to prepare their federal income tax return?.

Joey V
25/.02 =
1250 
Anonymous
No ande publicando cosillas que no son ciertas pendejete ;) pongase a estudiar mijo. Porfa.
atte: babi (aka los chingones hijo de tu chi****** madre)
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