Discrete random variables are NOT associated with which of the following items? a probability that the random variable X assumes a particular value x the sum of all probabilities is equal to or greater than 1 can be defined in terms of their cumulative distribution function a probability that each value of x is P(X=xi)1 What type of relationship is represented in the following scatterplot of the returns for stock portfolios A and B? positive relationship negative relationship no relationship steady relationship relationship, life expectance and gross national While birth rate and life expectancy have a income (size of bubble) have a relationship. negative; negative negative; positive positive; negative positive; positive Buster belleves the new manufacturing process will result in assembly times that are one-half minute faster than the previous process. Running 35 widgets through the old process and 30 widgets through the new process, Buster found the mean assembly time to be 32.6571 minutes (s.d. 1.924) and 32.1667 minutes (s.d. 1.949), respectively. Calculate the t-statistic for testing newold.. Assume the population variances are unequal. 2.055 1.017 0.019 1.017