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March 28, 2017

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How can you determine if you are using a two tailed test vs a one tailed test? For example, for the below, which test would I use?

Based on this data, at α =.01, can we conclude that the proportion of democrats who favor “junk food" tax is more than 5% higher than proportion of republicans who favor such a tax?

  • Statistics/Math- Please Help - ,

    For one-tailed test, you are only looking for deviation in one direction, indicated by your alternative hypothesis.

    Ho: a = b
    Ha: a > b or a < b

    For a two-tailed test, you are just looking for any difference.

    Ho: a = b
    Ha: a ≠ b

    I hope this helps.

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