Exam 1 Review and Section 3.2

Diana Pell

Exercise 1. Change the percent to fraction.

a) 34%

b) 12.5%

Exercise 2. Change the decimal to a percent

a) 0.5

b) 0.0723

Exercise 3. A jacket costs $75. If you use a coupon for 20% off, how much will you save?

Exercise 4. 1018 adults were asked whether they believe in evolution. 255 said that they do notbelieve in evolution. What percentage of respondents said that they did not believe in evolution.

Exercise 5. In one math class, the data below represent the number of hours each studentspends on homework in an average week.

Figure 1:

a) Construct a frequency distribution using 6 classes.

Class Tally Frequency

b) Construct a relative frequency distribution using the same class width and lower limit for thefirst class.

Class Frequency Relative Frequency

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c) Construct a relative frequency histogram.

Exercise 6. Classify each variable as a discrete variable or a continuous variable.

a) The highest wind speed of a hurricane

b) The number of pages in a statistics book

c) The number of female members of the U.S. House of Representatives

Exercise 7. Determine whether the data are qualitative or quantitative.

a) Cholesterol counts for individuals.

b) Genders of movie stars.

c) The seating capacity of an auditorium.

Exercise 8. What level of measurement would be used to measure each variable?

a) The ages of patients in a local hospital

b) The ratings of movies released this month

c) Colors of athletic shirts sold by Oak Park Health Club

d) Temperatures of hot tubs in local health clubs

e) Scores on a statistical final exam

Exercise 9. Identify the sampling method that was used.

a) To check the accuracy of a machine that is used for filling ice cream containers, every 20thbottle is selected and weighed.

b) To determine how long people exercise, a researcher interviews 5 people selected from a yogaclass, 5 people selected from a weight-lifting class, 5 people selected from an aerobics class,and 5 people from swimming classes.

c) In a large school district, a researcher numbers all the full-time teachers and then randomlyselects 30 teachers to be interviewed.

d) In a medical research study, a researcher selects a hospital and interviews all the patientsthat day.

e) Customers in the Sunrise Coffee Shop are asked how much they spend on coffee per week.

f) Ten counties in Pennsylvania are randomly selected to determine the average county realestate tax that the residents pay.

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Section 3.2

A time series graph represents data that occur over a specific period of time.

Exercise 10. State which type of graph (Pareto chart, time series graph, or pie graph) wouldmost appropriately represent the data.

a) Situations that distract automobile drivers

b) Number of persons in an automobile used for getting to and from work each day

c) Amount of money spent for textbooks and supplies for one semester

d) Number of people killed by tornados in the United States each year for the last 10 years

e) The number of pets (dogs, cats, birds, fish, etc.) in the United States this year

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f) The average amount of money that a person spent for his or her significant other for Christmasfor the last 6 years

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Misleading Graphs

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