Question: (a) Use the following code to compute the daily changes in Amazon closing stock prices. damzn % filter (Symbol ==AMZN, year (Date) >=2018) %>%

(a) Use the following code to compute the daily changes in Amazon closing stock prices. damzn % filter (Symbol =="AMZN", year (Date) >=2018) %>% mutate (trading_day = row_number()) %>% update_tsibble (index = trading day, regular = mutate (diff difference (Close)) (b) Why was it necessary to re-index the tsibble? (c) Plot these differences and their ACF. = (d) Do the changes in the stock prices look like white noise? TRUE) %>%

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