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

Exercise 5.11 provides a 95 % confidence interval for the mean waiting time at an emergency room (ER) of (128 minutes, 147 minutes). Answer the following questions based on this interval. (a) A local newspaper claims that the average waiting time at this ER exceeds 3 hours. Is this claim supported by the confidence interval? Explain your reasoning. (b) The Dean of Medicine at this hospital claims the average wait time is 2.2 hours. Is this claim supported by the confidence interval? Explain your