Examlex
A 1976 study of smokers over 30 years of age who delivered premature babies (fewer than 260 days of gestation) reported an infant survival rate of 72%. Suppose researchers would like to estimate the current survival rate. Based on the assumption that the survival rate today would be roughly similar to the survival rate in 1976, compute the sample size required to estimate the true survival proportion to within .05 with 95% confidence.
Probability
An indicator of how probable an event is, represented numerically between 0 and 1.
Nonrandom Sampling
A sampling technique where the samples are gathered in a process that does not give all the individuals in the population equal chances of being selected.
Sampling Error
Sampling error is the discrepancy between a sample statistic and its corresponding population parameter, caused by selecting a sample rather than conducting a census.
Mean Income
The average amount of income received over a specific period of time, calculated by dividing the total income by the number of recipients.
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