Question

The alternating current (AC) breakdown voltage of an insulating liquid indicates its dielectric strength. An article gave the accompanying sample observations on breakdown voltage (kV) of a particular circuit under certain 8 49 63 57 58 56 54 59 53 52 53 55 030 5658 a) Construct a boxplot of the data. 040 4 54 040 4S0 Ob) Calculate and interpret a 95% CI for tre average breakdown voltage . (Round your answers to one decimal place) Interpret the resulting interval. o we are 95% confident that this interval contains the true population mean. we are 95% confident that this interval does not contain the true population mean. we are 95% confident that the true population mean lies above this interval We are 95% confident that the true population mean lies below this interval Does it appear that u has been precisely estimated? Explain. This interval is quite wide relative to the scale of the data values themselves, so it could be argued that the mean has been precisely estimated. This interval is quite narrow relative to the scale of the data values themselves, so it could be argued that the mean has not been precisely estimated. o This interval is quite narrow relative to the scale of the data values themselves, so it could be argued that the mean has been precisely estimated. This interval is quite wide relative to the scale of the data values themselves, so it could be argued that the mean has not been precisely estimated. Suppose the investigator believes that virtually all values of breakdown voltage are between 40 and 70. What sample size would be appropriate for the 95% CI to have a width of 2 kV (so that μ is estimated to within 1 kV with 95% confidence)? (Round your answer up to the nearest whole number.)

Answer 1

The correct boxplot of the data is