DSMA: Quiz 2

Which of these variables is expected to be negatively correlated with a customer's next year's purchases?

• days since last purchase

• average purchase amount this year

• frequency of purchases this year

• no correct answer

X and Y are correlated with correlation coefficient r=0.05, p-value=0.001. The correlation is significant

• at 5% level and at 1% level

• at 5% level and 10% level, but not at 1% level

• at 10% level, but not at 5% level

• at 1% level, but not at 5% level

• at 1% level, but not at 5% level

A binary logistic regression model's prediction is always within (0,1) interval.

• True

• False

To forecast profit margin for each customer in 2022 an analyst can use data available for year ... as predictors

• 2022

• 2023

• 2024

• any year before 2020

Which of these tests can be used to compare revenue ($ amount) by gender (two groups)? Select ALL correct answers.

• t.test

• wilcox.test

• chisq.test

• prop.test

Amount_spent=20+3*male+4*promo+5*promo*male

male=1 if male.

promo=1 if promo-offer was sent, 0 otherwise.

What is the difference in amount spent between promoted males and females?

• 8

• 5

• 7

• 3

• 9

Which of these p-values indicate that the regression coefficients are significantly different from zero at the 10% level? Choose one or several options

• 0.09

• 0.049

• 0.0001

• 0.49

• 0.011

Amount_spent=20+3*male+4*promo+5*promo*male

male=1 if male.

promo=1 if promo-offer was sent, 0 otherwise.

What is the difference in amount spent between non-promoted males and females?

• 3

• 5

• 8

• 4

• 7