A bioengineering company manufactures a device for externally measuring blood flow. Measurements of the electrical output (milliwatts) on a sample of 16 units yields the data plotted in Figure 9.5.

(a) Should you report the 95% confidence interval for \(\sigma\) using the formula in this chapter? Explain.

(b) What is your answer to part (a) if you first take natural logarithms and then calculate the confidence interval for the variance of \(\ln\) (output)?

(c) Does your conclusion in part (b) readily imply anything about variance on the original scale? Explain.

Data From Figure 9.5

Transcribed Image Text:

11 18 15 3 7 1 11 22 23 37 5 2 30 3