AP Stats Cumulative Review #2

The appraised values of houses in a city have a mean of $125,000 with a standard deviation of $23,000. Because of a new teachers' contract, the school district needs an extra 10% in funds compared to the previous year. To raise the additional money, the city instructs the assessment office to raise all appraised house values by $5,000. What will be the new standard deviation of the appraised values of houses in the city?

• $23,000
• $25,300
• $28,000
• $30,300

Define a new measurement as the difference between the 60th and 40th percentile scores in a population. This measurement will give information concerning

• central tendency
• variability
• symmetry
• skewness

Tags

CCSS.HSS.ID.A.2

Which of the following can affect the value of the correlation, r?

• A chance in the measurement units.
• A change in which variable is called x and which is called y.
• Adding the same constant to all values of the x-variable.
• None of the above can affect the r-value.

Tags

CCSS.HSS.ID.C.8

Which among the following would result in the narrowest confidence interval?

• Small sample size and 95% confidence
• Small sample size and 99% confidence
• Large sample size and 95% confidence
• Large sample size and 99% confidence

Tags

CCSS.HSS.IC.B.4

The American Medical Association (AMA) wishes to determine the percentage of obstetricians who are considering leaving the profession because of the rapidly increasing number of lawsuits against obstetricians. How large a sample should be taken to find the answer within 3% at the 95% confidence level?

• 33
• 534
• 524
• 1068

Tags

CCSS.HSS.IC.B.4