We want to predict the mean strength of a product if we use plastic type B with a processing temperature of 125 degrees Celsius. The resulting 90% interval for a mean value is 140 - 150. What function in R would we use to calculate this interval? a. confint with the interval option set to "prediction" b. confint with the interval option set to "confidence" c. confint (there is no interval option) d. predict with the interval option set to "prediction" e. predict with the interval option set to "confidence" f. predict (there is no interval option) QUESTION 4 We want to predict the strength of a product if we use