Question: 1. If two variables have a strong relationship, then the regression line cannot have a negative slope. True or False 2. If 100 significance tests

1. If two variables have a strong relationship, then the regression line cannot have a negative slope. True or False

2. If 100 significance tests are conducted on 100 independent samples then it is very likely to make a type 1 error (rejecting the null when it shouldn't be rejected) in at least one of them. True or False

3. The correlation between the price of the dinner and the tips left by customers at a restaurant is 0.96. If every customer decided to give one dollar more in tips then this correlation would go down. True or False

4. If the points on a scatterplot tightly fit around the regression line Y = 2 -3X, we can conclude that the correlation

a. positive

b. negative

c. zero

d. could be positive or negative

If a value has a standard score of z = 2, we can say that value

a. is a 2 standard deviation below the mean

b. is a 2 standard deviation above the mean

c. equals 2 standard deviations times the mean

d. equals 2 means above the standard deviation

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