# The z value for a 978 confidence interval estimation

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Chapter 2 / Exercise 3
Essentials of Statistics for the Behavioral Sciences
Gravetter/Wallnau Expert Verified
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
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Chapter 2 / Exercise 3
Essentials of Statistics for the Behavioral Sciences
Gravetter/Wallnau Expert Verified
PTS:1TOP:Interval Estimation26.After computing a confidence interval, the user believes the results are meaningless because the width of the interval is too large. Which one of the following is the best recommendation?
PTS:1TOP:Interval Estimation27.If we change a 95% confidence interval estimate to a 99% confidence interval estimate, we can expecta.the size of the confidence interval to increaseb.the size of the confidence interval to decreasec.the size of the confidence interval to remain the samed.the sample size to increaseANS:A
PTS:1TOP:Interval Estimation28.In general, higher confidence levels provide
PTS:1TOP:Interval Estimation29.An interval estimate is a range of values used to estimate
PTS:1TOP:Interval Estimation
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