With reference to Exercise 11.9,

(a) find a 95% confidence interval for the mean current density when the strain is \(x=0.50\);

(b) find 95% limits of prediction for the current density when a new diode has stress \(x=0.50\).

Data From Exercise 11.9

11.9 Scientists searching for higher performance flexible structures created a diode with organic and inorganic layers. It has excellent mechanical bending proper- ties. Applying a bending strain to the diode actually leads to higher current density(mA/cm). Metal curva- ture molds, each having a different radius, were used to apply strain(%). For one demonstration of the phe- nomena, the data are