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August 31, 2015

Homework Help: STATS

Posted by Mary on Tuesday, March 30, 2010 at 12:28am.

Inferences about Two Proportions technique (Chapter 9):
There is a claim that proportion of successes increased in 2009 compare to 2008.
For data given in Table 1
Table 1
Number of cases Number of successes
2008 400 180
2009 500 235

Calculate pooled sample proportion and z-test statistics

Use a significance level of = 0.05 to make decision if there is a considerable change of proportion of successes.

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