Question

22 Intel Dual Core processors were shock tested to see what level of static shock would destroy the CPU chips. The average voltage for this sample was 47 volts with a standard deviation of 1.5 volts. Please give the LOWER VALUE for a 95% confidence interval for the true voltage level and submit the answer with 2 decimal places.

Answer 1

Solution :

Given that,

t ,df = 1.721

Margin of error = E = t,df * (s /n)

= 1.721 * (1.5 / 22)

Margin of error = E = 0.6

The 95% lower confidence level is,

- E

47 - 0.6

46.4

Lower value is 46.4