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    Critical values for testing correlation (r^2)

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    1. The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school. Use a two-tailed test. Is there an effect of nutritional supplementation? Submit your answers on a standard answer sheet.

    (e) Given a (alpha) =0.05, what is the critical value of t? (use a two tailed test)
    (f) Would an obtained value of t of 2.30 lie within the rejection region?
    (g) Does nutritional supplementation affect IQ scores (given that the obtained t =2.30)?
    (h) This result would be reported as: t ( ___ ) = _______, p _____ 0.05, r^2=

    looking for some steps for e,f,g,h?

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    Solution Preview

    1. The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school.  Use a two-tailed test.  Is there an effect of nutritional supplementation?  Submit your answers on a standard answer sheet.

    (e) Given alpha=0.05, what is the critical value of t? (use a two tailed test)
    (f) Would an ...

    Solution Summary

    The solution provides answer to the question whether correlation is significant

    $2.19

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