1) A random sample of 41 glass sheets is obtained & their thicknesses are measured. The sample mean is x=3.24 mm and sample standard deviation is s=0.124 mm.
a) Construct a 99% two-sided t-interval for the mean glass thickness.
b) How many additional glass sheets should be sampled to construct a 99% two sided t-interval for the average sheet thickness with a length no larger than Lo = 0.05 mm ?
a) Construct a 99% two-sided t-interval for the mean glass thickness.
b) How many additional glass sheets should be sampled to construct a 99% two sided t-interval for the average sheet thickness with a length no larger than Lo = 0.05 mm ?