Chi Squared Question 1 Check conditions for all three questi

Chi Squared Question 1

Check conditions for all three questions. If the null hypothesis is rejected for a question, calculate and comment on the residuals. If the expected value condition is not met, modify the table as needed before doing the test.

A 2000 study examined a sample of 278 pregnancies that produced twins, with the following results.

Twin Births 1995-1997 in thousands

Is there evidence of an association between the nature of the pregnancy/delivery and level of prenatal care?

	Preterm with procedures	Preterm without procedures	Term or Post-term	TOTAL
Intensive prenatal care	18	15	28	61
Adequate prenatal care	46	43	65	154
Inadequate prenatal care	12	13	38	63
TOTAL	76	71	131	278

All conditions are met.

The test hypothesis:

Ho: there is no evidence of an association between the nature of the pregnancy/delivery and level of prenatal care (i.e. null hypothesis)

Ha: there is a evidence of an association between the nature of the pregnancy/delivery and level of prenatal care (i.e. alternative hypothesis)

		Preterm with procedures	Preterm without procedures	Term or Post-term	Total
Intensive prenatal care	Observed	18	15	28	61
	Expected	16.68	15.58	28.74	61.00
	(O - E)

Chi Squared Question 1 Check conditions for all three questions. If the null hypothesis is rejected for a question, calculate and comment on the residuals. If t

Chi Squared Question 1 Check conditions for all three questi

Solution

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