Use the Two-Proportions Z-Test to Perform the Required Hypothesis Test

question 26

Essay

Use the two-proportions z-test to perform the required hypothesis test. Assume that independent simple randomsamples have been selected from the two populations. Use the critical-value approach.
-A random sampling of sixty pitchers from the National League and fifty-two pitchers from the American League showed that 19 National and 6 American League pitchers had E.R.A's below 3.5. At the 1% significance level, do the data provide sufficient evidence to conclude that the proportion of National League pitchers with E.R.A's below 3.5 differs from the proportion of American League pitchers with E.R.A's below 3.5 ?

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