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Math Help - help solving

  1. #1
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    help solving

    which of the following samples would have the smallest standard error?

    a.n=100 scores from a population with o=20
    b.n=25 scores from a population with o=10
    c.n=25 scores from a population with o=20
    d.n=100 scores from a population with o=10
    ---------------------------------------------------------------------------------
    if sample of n=4 scores is obtained from a population with m=70 and o=12,then a sample mean of m=76 would corresponds to a z-score of ______?

    a.z=1.00
    b.z=2.00
    c.z=0.50
    d.z=0.25
    ------------------------------------------------------------------------------------
    a sample of n=4 sores has the standard error o 12 what is the standard deviation of the population from which the sample was obtained?

    a.48
    b.6
    c.24
    d.3
    -------------------------------------------------------------------------------------
    assuming that all other factors are held constant as the population variability increases the standard error will also increase ?

    a.true
    b.false
    ----------------------------------------------------------------------------------
    for a normal population with a mean of u=80 and a standard deviation of o=10 what is the probability of obtaining a sample mean greater than m=75 for a sample of n=25 scores?

    a.p=0.6915
    b.p=0.3085
    c.p=0.9938
    d.p=0.0062
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  2. #2
    Super Member TheChaz's Avatar
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    Re: help solving

    FYI - this is not answers.yahoo.com

    Are you able/willing to show some work? There are at most 2 steps for each of these.
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  3. #3
    Flow Master
    mr fantastic's Avatar
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    Re: help solving

    Quote Originally Posted by noore View Post
    which of the following samples would have the smallest standard error?

    a.n=100 scores from a population with o=20
    b.n=25 scores from a population with o=10
    c.n=25 scores from a population with o=20
    d.n=100 scores from a population with o=10
    ---------------------------------------------------------------------------------
    if sample of n=4 scores is obtained from a population with m=70 and o=12,then a sample mean of m=76 would corresponds to a z-score of ______?

    a.z=1.00
    b.z=2.00
    c.z=0.50
    d.z=0.25
    ------------------------------------------------------------------------------------
    a sample of n=4 sores has the standard error o 12 what is the standard deviation of the population from which the sample was obtained?

    a.48
    b.6
    c.24
    d.3
    -------------------------------------------------------------------------------------
    assuming that all other factors are held constant as the population variability increases the standard error will also increase ?

    a.true
    b.false
    ----------------------------------------------------------------------------------
    for a normal population with a mean of u=80 and a standard deviation of o=10 what is the probability of obtaining a sample mean greater than m=75 for a sample of n=25 scores?

    a.p=0.6915
    b.p=0.3085
    c.p=0.9938
    d.p=0.0062
    Please don't post more than two questions in a thread. Otherwise the thread can get convoluted and difficult to follow. See rule #8: http://www.mathhelpforum.com/math-he...hp?do=vsarules.

    Also, please show some effort. See rule #11: http://www.mathhelpforum.com/math-he...hp?do=vsarules. Post what you can do and make it clear where you are stuck.

    Thread closed.
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