Consider the following time series data.
week 1 2 3 4 5 6
value 20 14 16 10 17 13
using the naïve method (most recent value) as the forecast for the next week, compute the following measures of forecast accuracy.
a. mean absolute error. if required, round your answer to one decimal place.

b. mean squared error. if required, round your answer to one decimal place.

c. mean absolute percentage error. if required, round your intermediate calculations and final answer to two decimal places.

%
d. what is the forecast for week 7? if required, round your answer to two decimal place.