Question

A supplier manufactures rubber baby buggy bumpers for the bumper cars. A random sample of 256 bumpers is taken and the sample mean life is 3.5 years with a standard deviation of .5 years. The law requires 95% confidence of operation when scheduling bumper replacement.

What are:
a) the lower-limit [A] and

b) the upper-limit [B]

of the two-sided confidence interval?

Answer 1

Solution file is attached go through it

Thanks