Why does a researcher decide to calculate odds ratio instead of calculating linear regression when comparing whether a person voted in the last election and the person's gender?
a. Voting records are sealed.
b. Both predictor and dependent variable are dichotomous.
c. Odds ratio is a simpler calculation.
d. Strength of relationship is not an issue.
ANS: B
When both the predictor and the dependent variable are dichotomous (having only two values; also called binary), the odds ratio is a commonly used statistic to obtain an indication of association. Linear regression is used to determine relationships with interval or ratio data. The odds ratio (OR) is defined as the ratio of the odds of an event occurring in one group to the odds of it occurring in another group. Put simply, the OR is a way of comparing whether the odds of a certain event is the same for two groups.
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Which of the following is a general definition for the term physical fitness?
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The patient at term has a suspected small pelvis. The fetus has an estimated weight of 4,200 g (9 pounds, 4 ounces). Spontaneous labor has begun, and the patient is now at 6 cm
The nurse understands that the most important nursing action for this patient is to: 1. Assist the patient to squat during the second stage. 2. Encourage oral fluids and carbohydrate intake. 3. Assess the cervix for change every eight hours. 4. Inform the couple that labor might be prolonged.