Question

% ) 8.2.23-т Question Help A manufacturing company produces electric insulators. You define the variable of interest as the strength of the insulators. If the insulators break when in use, a she circuit is likely. To test the strength of the insulators, you carry out destructive testing to determine how much force is required to break the insulators. You measure force by observing how many pounds are applied to the insulator before it breaks The data shown below represent the amount of orce required to break a sample 30 insulators Complete parts a through c below 10 27 12 27 15 32 25 29 32 24 24 27 c 24 37 20 56 34 23 a. Construct a 95% confidence interval for the population mean force spRound to two decimal places as needed)

Answer 1

Answer:

95% CI =   18.66 < µ < 27.94

$CI = \bar x \pm t* \frac {s}{\sqrt{n}}$

Confidence Interval Estimate for the Mean
Data
Sample Standard Deviation	12.4268
Sample Mean	23.3
Sample Size	30
Confidence Level	95%
Intermediate Calculations
Standard Error of the Mean	2.2688
Degrees of Freedom	29
t Value	2.0452
Interval Half Width	4.6402
Confidence Interval
Interval Lower Limit	18.6598
Interval Upper Limit	27.9402