Brakes Case Study Concerning the assumption of equal standard deviations for each of the two populations being sampled, how can we check this assumption and based on the check - does the assumption appear valid? Question 3 options: We are given the standard deviations of the populations and they are close. The assumption is valid. The value of sp, the pooled standard deviation, is between s1 and s2, so the assumption is valid. We are given the standard deviations of the two samples and they are close, so this makes us think the population standard deviations are similar. So, the assumption is valid. The spread in the two samples is different. So, the assumption is not valid. It is not possible to check this assumption with the information given