A hearing aid manufacturer wants to test [ Choose ] their three models of hearing aids. They randomly assign thirty people one of the Time Series - Multiplicative model three models of the hearing aids to try and Two Way ANOVA ask them to identify how many spoken word Time Series - Autoregressive model with lagged components they understand. One Way ANOVA A manager wants to model quarterly sales of [ Choose ] charcoal grills. There is a peak every year during the second quarter. A production manager wants to determine if [ Choose ] there is a difference in errors produced by three machines and two different work shifts. An investor wants to model sales of a large [ Choose ] online retailer where there is a consistent percentage increase from year to year