question archive A researcher studying the relationship between maternal age and length of breastfeeding in a sample of 75 primiparas found a correlation of
A researcher studying the relationship between maternal age and length of breastfeeding in a sample of 75 primiparas found a correlation of
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A researcher studying the relationship between maternal age and length of breastfeeding in a sample of 75 primiparas found a correlation of .19, which was not statistically significant at the .05 level. What was the estimated power of the statistical test? 0.40
Conversely, what was the risk that a Type II error was committed? 0.60
If .19 is a good estimation of the population correlation, what sample size would be needed in a replication study to achieve power = .80 at α= .05?
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The required size of the sample, n = 215
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