Statistics Final Exam Review

What percent of data on a normal curve is above z=1.45?

• 92.5%

• 42.5%

• 7.4%

• 34%

What percent of data on a normal curve is below z= -1.4?

• 8%

• 92%

• 58%

• 5%

Assume that the math SAT scores are normally distributed with a mean of 500 and a standard deviation of 100. If you score 480 on the math portion, what percent of those taking the test scored above you?

• 42%

• 58%

• 98%

• 92%

What data value is the upper quartile (Q3)?

• 64

• 62

• 66

• 58

What is the probability that the person picked will be a boy given they speak german? 

• .7273

• .4

• .16

• .22

What is the probability that they speak French given they are a girl? 

• 2.14

• 24

• 4

• 8571

Describe the correlation in the graph shown.

• Strong Negative

• Strong Positive

• Weak Negative

• Weak Positive

Estimate the correlation coefficient for this scatterplot.

• r = 0.56

• r = -0.56

• r = 0.92

• r = -0.92

The correlation coefficient measures...

• whether there is a relationship between two variables.

• the strength of the relationship between two quantitative variables.

• whether a cause and effect relation exists between two variables.

• the strength of the linear relationship between two quantitative variables.

Interpret the slope of the Least Squares Line Equation.

• Income increases by 31.45 with each additional 2 hours worked.

• Income increases by 31.45

• As hours increases by one, income will increase by 31.45.

• As hours increases by one, income will decrease by 242.3.