Practice AP Multi choice
Quiz by Daniel Caproni
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24 questions
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- Q1Which of the following statistics is defined as the 50th percentile?The interquartile rangeThe medianThe meanThe mode30s
- Q2A researcher wanted to estimate the average amount of money spent on extracurricular activities per school in a certain region. The researcher randomly selected 20 public schools and 20 private schools in the region to use for a sample. Which of the following best describes the type of sample that was taken?A stratified random sampleA cluster sampleA convenience sampleA simple random sample30s
- Q3Students in a large psychology class measured the time, in seconds, it took each of them to perform a certain task. The times were later converted to minutes. If a student had a standardized score of z = 1.72 before the conversion, what is the standardized score for the student after the conversion?z = 1.03z = 0.26z = 1.72The standardized score for the student after the conversion cannot be determined.30s
- Q4A researcher conducting a telephone survey is concerned about possible sources of bias. Of the following, which is the best example of nonresponse bias?The behavior of the interviewer leads people to respond in a certain way.The wording of the questions in the survey leads people to respond in a certain way.People might be uncomfortable with the survey questions and, as a result, might not always respond to those questions truthfully.Many of the people selected to participate in the survey who do not respond might have opinions different from those who do respond.30s
- Q5At a large conference of teachers from a variety of subjects, a random sample of 50 mathematics teachers attending the conference was selected. Among the selected mathematics teachers, 28 percent had taken one or more courses in statistics. For which of the following populations is 28 percent a reasonable estimate of the percentage of those who have taken one or more courses in statistics?All mathematics teachersAll teachers who attended the conferenceAll mathematics teachers who attended the conferenceAll mathematics teachers who have taken one or more courses in statistics30s
- Q6Which of the following best describes the shape of the distribution of used car prices at the dealership?Skewed to the left (negatively skewed)BimodalApproximately normalSkewed to the right (positively skewed)30s
- Q7Based on the boxplot, which of the following statements is the most reasonable conclusion?There are more students with data values below the median than there are students with data values above the median.There are more students with data values between the first quartile and the median than there are students with data values between the median and the third quartile.There are approximately the same number of students with data values between the first quartile and the minimum as there are students with data values between the third quartile and the maximum.There are fewer students with data values between the first quartile and the median than there are students with data values between the median and the third quartile.30s
- Q8On the day before an election in a large city, each person in a random sample of 1,000 likely voters is asked which candidate he or she plans to vote for. Of the people in the sample, 55 percent say they will vote for candidate Taylor. A margin of error of 3 percentage points is calculated. Which of the following statements is appropriate?It is not possible to draw any conclusion about the proportion of all likely voters who plan to vote for candidate Taylor because this is not an experiment.The sample proportion minus the margin of error is greater than 0.50, which provides evidence that more than half of all likely voters plan to vote for candidate Taylor.The proportion of all likely voters who plan to vote for candidate Taylor must be the same as the proportion of voters in the sample who plan to vote for candidate Taylor (55 percent), because the data were collected from a random sample.It is not possible to draw any conclusion about the proportion of all likely voters who plan to vote for candidate Taylor because this is a random sample and not a census.30s
- Q9The caffeine content of 8-ounce cans of a certain cola drink is approximately normally distributed with mean 33 milligrams (mg). A randomly selected 8-ounce can containing 35 mg of caffeine is 1.2 standard deviations above the mean. Approximately what percent of 8-ounce cans of the cola have a caffeine content greater than 35 mg?16%8%1%12%30s
- Q10A random variable X has a mean of 120 and a standard deviation of 15. A random variable Y has a mean of 100 and a standard deviation of 9. If X and Y are independent, approximately what is the standard deviation of X - Y?24.017.56.012.030s
- Q11Athletes in a particular sport are classified as either offense or defense. The distribution of weights for the athletes classified as offense is approximately normal, centered at 200 pounds, and ranges from 150 pounds to 250 pounds. The distribution of weights for the athletes classified as defense is approximately normal, centered at 300 pounds, and ranges from 250 pounds to 350 pounds. There are 1,000 athletes in each classification. Which of the following is the best description of a histogram of the weights of all 2,000 athletes?Skewed to the right (positively skewed)Skewed to the left (negatively skewed)BimodalApproximately uniform and centered at 250 pounds30s
- Q12Which of the following pairs of sample size n and population proportion p would produce the greatest standard deviation for the sampling distribution of a sample proportion pˆ ?n = 100 and p close to 1/2n = 1,000 and p close to 1/2n = 100 and p close to 0n = 1,000 and p close to 030s
- Q13A 90 percent confidence interval for the slope of a regression line is determined to be (- 0.181,1.529). Which of the following statements must be true?The sum of the residuals for the data based on the regression line is positive.The slope of the sample regression line is 1.348.The correlation coefficient of the data is positive.A scatterplot of the data would show a linear pattern.30s
- Q14A matched-pairs t-test is NOT an appropriate way to analyze data consisting of which of the following?Measurements of annual income recorded for both spouses of 100 randomly selected married couplesMeasurements of annual income for both individuals in pairs formed by assigning 100 people to pairs at randomMeasurements of annual income for each twin for 100 randomly selected pairs of twinsMeasurements of annual income for both individuals in pairs formed by matching 100 people from State A and 100 people from State B based on level of education30s
- Q15Which of the following statements about the people in the sample must be true?More than half of the men had lower pulse rates than three-fourths of the women.The person with the lowest pulse rate is a woman.At least half of the women had higher pulse rates than three-fourths of the men.If a man and a woman were randomly selected from the 40 people, the man would have the lower pulse rate.30s
