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How to find margin of error for Statistics class using TI-84?

n=550

x=220

95% confidence

I need the margin of error for these above values. Please tell me the steps to find them with the TI-84 calculator. Thanks.

2 Answers

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  • Anonymous
    1 decade ago
    Favorite Answer

    Okay!

    E=Za/2 (squareroot (p^ x q^ / n))

    So...

    p^ = x/n = 220/550 = .4

    q^ = 1 - p^ = 1 - .4 = .6

    Za/2 = .95 + .5/2 = .975

    *Go into you calculator 2nd > VARS > 3 invNorm > .975 > ) > ENTER = 1.96

    So...

    .4*.6 = .24

    .24/550 = .0209

    squareroot ANS

    multiply by 1.96

    E=.0409 Ta Da!

    Maybe someone else can explain it better? >.<

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  • 4 years ago

    Margin Of Error E Calculator

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