Since a t test for independent means may be used when Sample 1 and Sample 2 include different numbers of participants, the two estimates of the population variance are combined into an overall pooled estimate using a(n) . Group of answer choices regression analysis effect estimate weighted average correlation coefficient

The weight of a small starbucks coffee is a normally distributed random variable with a mean of 340 grams and a standard deviation of 11 grams. find the weight that corresponds to each event. (use excel or appendix c to calculate the z-value. round your final answers to 2 decimal places.)highest 30 percent middle 70 percent highest 90 percent lowest 20 percent