A 95 % confidence interval for a population mean was reported to be 152 to 160 . If σ=15 what sample size was used in this study? | Numerade

SOLVED: Which statement is not true about confidence intervals? A confidence interval is an interval of values computed from sample data that is likely to include the true population value. An approximate formula for a 95% confidence interval is sample estimate multiplied by the margin of error. A confidence interval between 20% and 40% means that the population proportion lies between 20% and 40%. A 99% confidence interval procedure has a higher probability of producing intervals that will incl

SOLVED: If a confidence level of 94% is used to construct a confidenceinterval for the mean μ of a normal population when the value ofthe standard deviation σ is known, select the value of the zcritical value to be used.