The following is a set of hypotheses, some information from one or more samples, and a standard error from a randomization distribution. Test H0 : p=0.28 vs Ha : p<0.28 when the sample has n=800, and p^=0.217 with SE=0.01. Required:
Find the value of the standardized z-test statistic.

Z = -6.3

Step-by-step explanation:

Given that:

Since the alternative hypothesis is less than 0.28, then this is a left-tailed hypothesis.

Sample sixe n = 800

= 0.217

The standard error

Since this is a single proportional test, the test statistics can be computed as:

Z = -6.3

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step-by-step explanation: