AP Statistics 1st
Chapter 1 & 2 Review
1. What are the two types of variables? Give examples of each.
2. How do you describe a distribution?
3. Floyd scored 85, 92, 89 on his first three midterm exams. What does he need to score on his next exam in order to have an A (90%) average?
4. What is the IQR and how do you find it?
5. What percent of the data is in the IQR
6. How do you test for outliers?
7. With respect to resistance, what is the difference between the mean and median? Give an example to demonstrate this difference.
8. To analyze the balance of answers for 5000 true/false questions in its data bank, a standardized testing service assigned the value 1 to each question with answer true and 0 to each question with answer false. They then computed the mean and the median. a) The median came out to be 1. What does this tell you about the number of true or false questions?
b) The mean came out to be 0.7. What does this tell you about the number of true or false questions?
9. Find the five-number summary for these sets of data and draw a boxplot. a) 2, 2, 4, 7, 9, 10, 11
b) 3, 3, 4, 5, 7, 8, 13, 17
10. The figure to the right shows a density curve. Use areas under this curve to find the proportion of observations within the following intervals:
a) 0 ( x ( 5
b) 6 ( x ( 9
c) 11 ( x ( 15
d) Approximately what is the first quartile?
11. Marry got a 28 on her biology test. Bill got a 408 on his statistics test. The statistics test was approximately normally distributed with mean 350 and a standard deviation of 25. The biology test was approximately normally distributed with mean 22 and a standard deviation of 2.5. a) Who did better on their test? Justify your answer.
b) What does Marry need to get on her biology test in the 87th percentile?
12. The distributions below are all normal with mean 45 and standard deviation 15. Label the x-axis on the graphs...
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