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January 28, 2015

January 28, 2015

Posted by **Anonymous** on Friday, March 2, 2012 at 4:58pm.

- statistics -
**MathGuru**, Friday, March 2, 2012 at 6:35pmYou will need to use a formula for a binomial proportion two-sample z-test.

Proportion of adults = 10/120 = .083

Proportion of youths = 18/80 = .225

Use these proportions in the formula.

Null:

Ho: pY = pA (A = adults; Y = youths)

Alternative:

Ha: pY > pA

This will be a one-tailed test at .01 level of significance. (Use a z-table to determine the critical or cutoff value to reject the null.) If the test statistic calculated from the formula exceeds the critical value from the table, reject the null and conclude pY > pA. If the test statistic does not exceed the critical value from the table, do not reject the null (there is no difference).

I hope this brief explanation will help get you started.

- statistics -
**carlos**, Friday, March 2, 2012 at 7:12pm(b) How many would you expect to be taller than 160 cm?

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