Confidence levels allow the researcher to have some idea of how closely their samples reflect the parameter. which statement about confidence levels is true?
a. if a simple random sample is used, probability theory suggests that researchers can almost be positive (95+ percent) that estimates of that sample fall within 2 standard errors of the true value.
b. if a simple random sample is used, probability theory suggests that researchers can be 68 percent sure that estimates of that sample fall within 2 standard errors of the parameter.
c. if a simple random sample is used, probability theory suggests that researchers can be 95 percent sure the estimates of that sample fall within 1 standard error of the parameter.
d. if a simple random sample is used, probability theory suggests that researchers can be positive that sample mean is equivalent to population mean.