Download AP Stat Chapter 1 In Class Review

AP Stat Chapter 1 In Class Review
1. A year ago, Angela began working at a computer store. Her supervisor asked her to keep a record
of the number of sales she made each month.
The following data set is a list of her sales for the last 12 months:
34, 47, 1, 15, 57, 24, 20, 11, 19, 50, 28, 37
Like Angela, Carl works at a computer store. He also recorded the number of sales he made each
month. In the past 12 months, he sold the following numbers of computers:
51, 17, 25, 39, 7, 49, 62, 41, 20, 6, 43, 13.
1. Give a five-number summary of Carl's and Angela's sales.
2. Make two box and whisker plots, one for Angela's sales and one for Carl's.
3. Briefly describe the comparisons between their sales.
4. The frequency table of the monthly salaries of 20 people is shown below. Salary (in $)
Frequency
3500
5
4000
8
4200
5
4300
2
a) Calculate the mean of the salaries of the 20 people. b) Calculate the standard deviation of the salaries of the 20 people.
5. Consider the following three Data Sets A, B, and C.
A= {4, 8, 10, 11, 12}
B = {5, 5, 5, 5, 5}
C = {3, 2, 10, 15, 15}
a) Calculate the mean of each data set.
b) Calculate the standard deviation of each data set.
c) Which set has the largest standard deviation?
d) Is it possible to answer question “c” without calculations of the standard deviation?
6. In 1997, there were 12,298,000 undergraduate students in US colleges. According to the US
Department of Education, there were 127,000 American Indian or Alaskan Native, 737,000 Asian or
Pacific Islander, 1,380,000 non-Hispanic black, 1,108,000 Hispanic, and 8,682,000 non-Hispanic
white students. In addition, 265,000 foreign undergraduates were enrolled in US colleges.
a) Each number, including the total, is rounded to the nearest thousand. Separate rounding
may cause roundoff errors, so that the sum of the counts does not equal the total given. Are round off
errors present in these data? Explain.
b) Present the data in a graph.
7. How much oil wells in a given field will ultimately
produce is key information in deciding whether to drill
more wells. Here are the estimated total amounts of oil
recovered from 64 wells
in the Devonian
Richmond Dolomite
area of the Michigan
basin, in thousands of
barrels.
a) Use the information provided to describe the important features of this distribution.
8. The histogram shows the number of major hurricanes that reached the East Coast of the United States from
1944 to 2000. Describe the shape, center, and spread of the distribution.
Some extra questions with answers provided:
http://spot.pcc.edu/~hmesa/math243/homework/chapter1/6th_chapter1_sect_1.pdf