I am lost as all get out any help would be nice thnaks 22 In

I am lost as all get out any help would be nice thnaks

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 43 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.

Solution

Average of the sample = 43 volts

Std dev s = 1.5 volts

Sample size = 22

95% z value on either side = 1.96

std error = 1.5/rt 22 = 0.320

Margin of error for mean = std error * z = 1.96(0.320)

=0.627

Lower bound for confidence interval = x bar - margin of error = 42.373 = 42.37

Upper bound for confidence interval = x bar + margin of error = 43.627 = 43.63