In evaluating different measuring instruments one must first determine whether
In evaluating different measuring instruments one must first determine whether
In evaluating different measuring instruments, one must first determine whether there is a systematic difference between the instruments. Lenses with several different powers were measured once each by two different instruments. The measurement differences (Instrument A – Instrument B) were recorded.The measurement units have been coded for proprietary Dreasons.
Does there appear to be a systematic difference between the two instruments?
a. Describe the data using a histogram and one other graph.
b. Find the mean and the standard deviation.
c. Are the assumptions required for making inferences satisfied? Explain.
d. Using a 95% confidence interval, estimate the population mean of the differences.
e. Is there any evidence of a difference? Explain.