The monthly sales of a new business software package at a local discount software store were as follows: week 1 2 3 4 5 6 7 8 9 10 sales 460 415 432 450 488 512 475 502 449 486 1. plot the data and provide insights about the time series. 2. find the best number of weeks to use in a moving average forecast based on mse. 3. find the best single exponential smoothing model to forecast these data.

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.