If we were interested in calculating the test at the α = 0. The iron intakes ( irondef.txt) of a random sample of 25 such American females yielded a t-statistic of -1.48. Is there evidence that the population of American females is, on average, getting less than the recommended 15 mg of iron? That is, should we reject the null hypothesis H 0: μ = 15 against the alternative H A: μ < 15? The US National Research Council currently recommends that females between the ages of 11 and 50 intake 15 milligrams of iron daily.

In these painful and confusing times it is all too easy to. For a two-tail test multiply the one-tail probability by two. Read 12 reviews from the worlds largest community for readers. The P-value is this probability for a lower-tail test or one minus this probability for an upper-tail test.He and his wife, Helen, are the parents of eight children and grandparents of fifty eight. degree from the University of Southern California and has practiced dentistry in California and Idaho. The probability that a t-distributed random variable with this number of degrees of freedom is less than or equal to the test statistic will appear in the session window. Author Aubrey Andelin received his D.D.S. In the box, type the test statistic for which you want to find the associated cumulative probability. Click the button labeled ' Input constant'.Type the number of degrees of freedom in the box labeled ' Degrees of freedom'.

Click the button labeled ' Cumulative probability'.

Select Calc > Probability Distributions > t.

You may need to find a P-value if you are using the P-value approach to conduct a hypothesis test that uses a t-statistic.

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