21- what is the forecast error for 02/10 using single exponential smoothing, if alpha=0.2 and forecast for 01/10 is 200?

Date my bakery sales yhat

01/10 300 ?

02/10 500

03/10 600

04/10 750

A- 250

B-260

C-280

D-270

E-Can't be determined with the information provided

22- which of the following is NOT an ARIMA step?

A- Diagnostic checks

B- Assumptions check

C- Forecasting

D- Model Estimation

E-Model identification

23- The autocorrelation function shows two spike at lag lengths one and two. such a series can be modeled as a -------modle

A- AR(3)

B-AR(2)

C-MA(3)

D-MA(2)

E- All of the above are possible depending on how PACF looks

24- When looking at regression what measurement should you look at to detect multicollinearity in the model?

A- DW

B-P-value

C-F-Statistic

25- Which of the following statement is true based on the regression equation given below

IQ=7.00+2.2* Reading ability

-

-

-

-Reading ability is not a good predictor of IQ

A- A unit change in IQ will result in a 2.2 unit increase In reading ability

B- A unit change in IQ will result in a 7.00 unit increase in reading ability

C- A unit change in reading ability will increase IQ by 2.2 unit

D- IQ will be 116 for a reading ability level of 45