Mary used a sample of 68 large u.s. cities to estimate the relationship between

Decrease by 50.

Explanation:

Estimated regression equation was:

Crime = 428 + 0.050 Income

Above regression equation says that if there is an increase in the income level by $1 then as a result crime increases by 5% which shows that there is a direct relationship between the income level and crime level.

Hence, if Income decreases by 1000, then we would expect that Crime will decreases by:

= 0.050 × 1,000

= 50

Decrease by 50.

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