Chi Squared Question 1 Check conditions for all three questions. If the null hyp

Question

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

Explanation / Answer

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)

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