a A cell phone manufacturer wants to advertise their new

Last updated: 4/7/2024

a A cell phone manufacturer wants to advertise their new extended life batteries They believe the lifetimes are normally distributed with 1 15 hr A test engineer takes a sample of 10 batteries and calculates a sample standard deviation of 1 3 hr Can the manufacturer confidently advertise the standard deviation in the lifetime of their new batteries Use critical values of x2 95 and X2 05 a 90 window i Find the value of the test statistic for this sample and the two critical values X0 95 x X 05 ii Can the manufacturer confidently advertise the standard deviation in the lifetime of their new batteries Circle YES or NO and briefly explain your answer YES