Exam 2: Organizing and Summarizing Data

A researcher records the number of employees of each of the IT companies in the town of Westmoore. Theresults are summarized in the table. Number of Employees Number of IT Companies 0-399 36 400-799 22 800-1199 9 1200-1599 6 1600-1999 7 Find the class limits of the third class.

A random sample of 30 high school students is selected. Each student is asked how much time he or she spenton the Internet during the previous week. The following times (in hours) are obtained: 14 22 16 19 16 14 16 15 13 19 17 15 15 14 17 16 13 13 18 15 14 22 16 19 16 14 16 15 13 19 17 15 15 14 17 16 13 13 18 15 13 15 22 17 14 18 14 17 16 15 13 15 22 17 14 18 14 17 16 15 Construct a frequency distribution for the data.

Height (in inches) Frequency 50-52 5 53-55 8 56-58 12 59-61 13 62-64 11

The bar graph below shows the political party affiliation of 1000 registered U.S. voters. What percentage of the1000 registered U.S. voters belonged to one of the traditional two parties (Democratic and Republican)?

Student Council President 700 total votesWho got the most votes?

The preschool children at Elmwood Elementary School were asked to name their favorite color. The results arelisted below. Construct a frequency distribution and a relative frequency distribution. yellow yellow blue purple red red red yellow red blue red blue purple purple purple blue red purple red green

Use the following frequency distribution to determine the class limits of the third class. Class Frequency 9-11 7 12-14 11 15-17 8 18-20 5 21-23 9 24-26 6

The data set: ages of dishwashers (in years) in 20 randomly selected households 12 6 4 9 11 1 7 8 9 8 9 13 5 15 7 6 8 8 2 1

Is either histogram symmetric?

A researcher records the number of employees of each of the IT companies in the town of Westmoore. Theresults are summarized in the table. Number of Employees Number of IT Companies 0-749 30 750-1499 24 1500-2249 6 2250-2999 5 3000-3749 5 Find the class width.

The table below summarizes the weights of the almonds (in grams) in a one-pound bag. What is the classwidth? Weight () Frequency 0.7585-0.8184 1 0.8185-0.8784 1 0.8785-0.9384 1 0.9385-0.9984 3 0.9985-1.0584 157 1.0585-1.1184 171 1.1185-1.1784 8

The grade point averages for 40 evening students are listed below. Construct a frequency polygon using eightclasses. 2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 0.8 3.1 2.4 2.4 2.3 1.6 1.6 4.0 3.1 3.2 1.8 2.2 2.2 1.7 0.5 3.6 3.4 1.9 2.0 3.0 1.1 3.0 4.0 4.0 2.1 1.9 1.1 0.5 3.2 3.0 2.2

What is the difference between a bar chart and a histogram?

The local police, using radar, checked the speeds (in mph) of 30 motorists in a construction area. The results arelisted below. Construct a frequency distribution, a relative frequency distribution, a cumulative frequencydistribution, and a relative cumulative frequency distribution using six classes. 44 38 41 50 36 36 43 42 49 48 35 40 37 41 43 50 45 45 39 38 50 41 47 36 35 40 42 43 48 33 3 Construct frequency and relative frequency ogives.

The data below represent the consumption of high-energy drinks (in gallons) by adult Americans over anine-year period. Year 1 2 3 4 5 6 7 8 9 Consumption (gal) 10 11 11 12 13 14 15 15 13

Student Council President What percent of the votes did Jim and Ann receive together?

In what quarter was the revenue the greatest for Year 2?

The class width is the difference between

Women were allowed to enter the Boston Marathon for the first time in 1972. Listed below are the winningwomenʹs times (in minutes) for the first 10 years. Year 1 2 3 4 5 6 7 8 9 10 Time 190 186 167 162 167 168 165 155 154 147 2.4 Graphical Misrepresentations of Data1 Describe what can make a graph misleading or deceptive.

The grade point averages for 40 evening students are listed below. Construct a frequency ogive usingeight classes. 2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 0.8 3.1 2.4 2.4 2.3 1.6 1.6 4.0 3.1 3.2 1.8 2.2 2.2 1.7 0.5 3.6 3.4 1.9 2.0 3.0 1.1 3.0 4.0 4.0 2.1 1.9 1.1 0.5 3.2 3.0 2.2