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Math Help - state the null and alternative hypothsis

  1. #1
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    state the null and alternative hypothsis

    Online ads targeting children were said to have decreased at least 56% between May and August 2000. A sample of 100 ads selected during this period showed a 45% decrease in online ads targeting children. State the null and alternative hypotheses and carry out the test at the 1% level of significance.

    Here, which one shud be the null hypothesis H_0, and which one should be H_a? I'm confused.
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  2. #2
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    Re: state the null and alternative hypothsis

    Quote Originally Posted by wopashui View Post
    Online ads targeting children were said to have decreased at least 56% between May and August 2000. A sample of 100 ads selected during this period showed a 45% decrease in online ads targeting children. State the null and alternative hypotheses and carry out the test at the 1% level of significance.

    Here, which one shud be the null hypothesis H_0, and which one should be H_a? I'm confused.
    Take a null hypothesis that the number of adds targeting children has decreased by 56%, and the alternative as the decrease is less than 56%.

    However I don't think the data you have been given is adequate to construct such a test for a number of reasons.

    CB
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  3. #3
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    Re: state the null and alternative hypothsis

    Quote Originally Posted by wopashui View Post
    Online ads targeting children were said to have decreased at least 56% between May and August 2000.
    The claim being tested is always the "null hypothesis".

    A sample of 100 ads selected during this period showed a 45% decrease in online ads targeting children. State the null and alternative hypotheses and carry out the test at the 1% level of significance.

    Here, which one shud be the null hypothesis H_0, and which one should be H_a? I'm confused.
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  4. #4
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    Re: state the null and alternative hypothsis

    so shud I make H_0: P= 56%, and H_a: P<56%, however,it's at least 56%, does it mean p>=56%
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