A study prospectively examined whether sleep-disordered breathing was associated

Question

A study prospectively examined whether sleep-disordered breathing was associated with an increased risk of death from any cause in a cohort of 6294 adults participating in the Sleep Heart Health Study. Study participants were classified into four groups depending on the extent of their sleep-disordered breathing (none, mild, moderate, or severe). The counts of deaths over the course of the study are reported for each group in the two-way table below. Do the study findings give evidence of a significant relationship between the extent of sleep-disordered breathing and death? (a) What is the appropriate test to address this question? one-way ANOVA F test chi-square test of independence t-test for linear regression 2-proportion z test Under the null hypothesis of no relationship, (b) the expected cell count that from the severe sleep-disordered breathing and death cell is (round to 2 decimal places) (c) the contribution to the test statistic that comes from the severe sleep-disordered breathing and death cell is (round to 2 decimal places)

Explanation / Answer

The statistical software output for this problem is:

Contingency table results:
Rows: var1
Columns: None

Chi-Square test:

Hence,

From the table, we can see that:

Contribution to test statistic that comes from severe and death cell is 20.79

Cell format Count
(Contributions to Chi-Square)

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