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Data Science Dumps For EMC- E20-007

 

Question ID 6282

Before you build an ARMA model, how can you tell if your time series is weakly stationary? 

Option A

 

There appears to be a constant variance around a constant mean.

 

 

 

Option B

The mean of the series is close to 0.

Option C

The series is normally distributed.

Option D

There appears to be no apparent trend component.

Correct Answer A
Description 
Update Date and Time 2017-04-28 11:12:03

 

Question ID 6283

What is an example of a null hypothesis?

Option A

that a newly created model does not provide better predictions than the currently existing model

Option B

that a newly created model provides a prediction of a null sample mean 

Option C

that a newly created model provides a prediction of a null population mean

Option D

that a newly created model provides a prediction that will be well fit to the null distribution

Correct Answer A

Description 
Update Date and Time 2017-04-28 11:13:30

 

 

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