If z = 1.96, the variance is 3, and the allowable sampling error is plus or minus $0.5, what is the approximate sample size needed for this study?

Sample size calculations: n = (Z²²)/ E², n = Z²P (1-P) / E²

47

45

49

46.66

Assume that previous food research has shown that 70 percent of the consumers like onion rings. The researcher wishes to have an error of 6 percent or less and be 95.44 percent confident (Z score of 2) of an estimate to be made about onion ring consumption from a survey. What sample size should be used for a simple random sample?

Sample size calculations: n = (Z²²)/ E², n = Z²P (1-P) / E²

432

234

433

243