Question B

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 short 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 accompanying data represent the amount of force required to break a sample of 30 insulators. Complete parts (=) through (c) below. Click the icon to view the data. a. Construct a 90% confidence interval for the population mean force. 1897 Sus 1753 X (Round to the nearest integer as needed.) Force data b. What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)? O A. The population distribution is unimodal and not extremely skewed. 1.854 1,723 1,686 1,815 1.641 1,757 1,589 1.853 1.556 1,653 1,887 1.682 O B. The population distribution is not normally distributed. 1,706 1,675 1,711 1,789 1,563 1.775 1,759 1,893 1,849 1,705 1,759 1,776 1,845 1,787 1.678 1,818 1,886 1,733 O C. The population distribution is uniformly distributed. O D. The population standard deviation is known. Print Done