A precision instrument is guaranteed to read accurately to within 2 units. A sample of four instrument readings on the same object yielded the measurements 353, 351, 351, 355.
a.) Test the null hypothesis that? = 0.7 against the alternative ? >0.7 Use alpha = 0.05
b.) What is the 95% CI for sigma?
c.) What is the critical value?
d.) What is the correct decision?