Question12 True/False: The snowflake schema differs from the star schema in that

Question

Question12

True/False: The snowflake schema differs from the star schema in that the table holding the dimensional data are normalized.

Select one:

True

False

Question 13

Which of the following statements will generate a multiple linear regression model within R where the output or predicted variables is Sales and the prediction variables include temperature and unemploymentrate?  

Select one:

a. lm(sales~temperature+unemploymentrate)

b. lm(temperature+unemploymentrate=sales)

c. lm(sales+temperature~unemploymentrate)

d. None of these commands are valid

Question 14

True/False: A regression model has a R2 statistic of .15.   This indicates that the regression model is NOT a good fit and does a poor job of predicting the outcome based upon the input variables.

Select one:

True

False

Question 15

True/False: Data Mining can be said to be a process designed to detect patterns in data sets.

Select one:

True

False

Explanation / Answer

12. In snowflake schema dimensions are normalized- true

13.sales is output or response of predictor variables temperature and unemployment

answer: optionA

14.False;if r2 statistic is negative number then it indicates that the model is not a good fit.

15.True;Data mining is a process to detect patterns in data sets.

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