19.The z value for a 97.8% confidence interval estimation isa.2.02b.1.96c.2.00d.2.29ANS:D
PTS:1TOP:Interval Estimation20.The t value for a 95% confidence interval estimation with 24 degrees of freedom is
PTS:1TOP:Interval Estimation21.As the sample size increases, the margin of error
PTS:1TOP:Interval Estimation22.For which of the following values of P is the value of P(1 - P) maximized?
PTS:1TOP:Interval Estimation23.A 95% confidence interval for a population mean is determined to be 100 to 120. If the confidence coefficient is reduced to 0.90, the interval for a.becomes narrowerb.becomes widerc.does not changed.becomes 0.1ANS:A
PTS:1TOP:Interval Estimation24.Using an = 0.04 a confidence interval for a population proportion is determined to be 0.65 to 0.75. Ifthe level of significance is decreased, the interval for the population proportion
PTS:1TOP:Interval Estimation25.The ability of an interval estimate to contain the value of the population parameter is described by the