Statistics

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 18-34 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 18-34 year olds who use online tax program was 16%]

2) If the number of 35-44 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 35-44 year olds who use online tax program was 12%)

asked by Jen
  1. 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.

    posted by MathGuru
  2. 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?.

    posted by Anonymous
  3. 25/.02 =
    1250

    posted by Joey V
  4. No ande publicando cosillas que no son ciertas pendejete ;) pongase a estudiar mijo. Porfa.

    atte: babi (aka los chingones hijo de tu chi****** madre)

    posted by Anonymous

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