Exam 2: Organizing Data

Construct the requested histogram. -In a survey, 20 voters were asked their age. The results are summarized in the table below. Construct a frequency histogram corresponding to data below. Age of voters Number of voters 20 -under 30 5 30 -under 40 5 40 -under 50 6 50 -under 60 0 60 -under 70 4

Use cutpoint grouping to organize these data into a frequency distribution. -Lori asked 24 students how many hours they had spent doing homework during the previous week. The results are shown below. 11 10 11 9 11 11 14 12 11 8 12 10 10 12 11 10 12 11 10 12 10 12 12 9 Construct a frequency distribution. Use 4 classes, a class width of 2 hours, and a lower limit of 8 for the first class. Hours Frequency

A graphical display of a data set is given. State whether the distribution is (roughly)symmetric, right skewed, or leftskewed. -A stem-and-leaf diagram is given below for the number of vacation days taken in 2006 by the employees of an electronics company. 0 401363584368002 1 14251403010 2 02034 3 01 4 3

A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogramfor the systolic blood pressure readings for those people aged between 25 and 40. Use the histogram to answer thequestion. The blood pressure readings were given to the nearest whole number. -Approximately what percentage of the people aged 25-40 had a systolic blood pressure reading between 110 and 119 inclusive?

A graphical display of a data set is given. Identify the overall shape of the distribution as (roughly)bell-shaped,triangular, uniform, reverse J-shaped, J-shaped, right skewed, left skewed, bimodal, or multimodal. -A die was rolled 200 times and a record was kept of the numbers obtained. The results are shown in the relative frequency histogram below.

A person's blood type can be classified as A, B, AB, or O. In this example, "blood type" is the variable while A, B, AB, O constitute the data.

Construct the requested histogram. -The table gives the frequency distribution for the data involving the number of radios per household for a sample of 80 U.S. households. \# of Radios Frequency 1 5 2 10 3 30 4 25 5 10 Construct a frequency histogram.

Shortly before a mayoral election, a market research firm took a poll to find out which candidate people were planning to vote for. The results are shown below. Candidate Frequency Li Fong 2120 Bob Green 2329 Sue Moore 1042 Jose Alvarez 399 You wish to construct a graph to represent the data. It should be easy to see from your graph which candidate is in the lead. Which graph would be more useful, a bar graph or a pie chart? Explain your thinking.

A graphical display of a data set is given. Identify the overall shape of the distribution as (roughly)bell-shaped,triangular, uniform, reverse J-shaped, J-shaped, right skewed, left skewed, bimodal, or multimodal. -A frequency histogram is given below for the weights of a sample of college students.

A variable whose values are observed by counting something must be a discrete variable.

Construct a stem-and-leaf diagram for the given data. -The diastolic blood pressures for a sample of patients at a clinic were as follows. The measurements are in mmHg. 78 87 91 85 97 102 73 90 110 105 94 85 81 95 77 106 84 111 83 92 79 81 96 88 100 85 89 101 83 120 88 95 78 74 105 85 87 92 114 83

The midterm test scores for the seventh-period typing class are listed below. 85 77 93 91 74 65 68 97 88 59 74 83 85 72 63 79

The following table gives the top five movies at the box office this week. Rank Last week Movie title Studio Box office sales (\ millions) 1 N/A Pirate Adventure Movie Giant 35.2 2 2 Secret Agent Files G.M.G. 19.5 3 1 Epic Super Hero Team 22nd Century 14.3 4 5 Reptile Ride Movie Giant 10.1 5 4 Must Love Cats Dreamboat 9.9 What kind of data is provided by the information in the fifth column?

Identify the variable. -The following table gives the top five movies at the box office this week. Rank Last week Movie title Studio Box office sales (\ millions) 1 N/A Pirate Adventure Movie Giant 35.2 2 2 Secret Agent Files G.M.G. 19.5 3 1 Epic Super Hero Team 21st Century 14.3 4 5 Reptile Ride Movie Giant 10.1 5 4 Must Love Cats Dreamboat 9.9 Identify the variable under consideration in the third column?

Provide an appropriate response. -Suppose you wanted to construct a stem-and-leaf diagram for the data set below. What leaf unit would you use? What numbers would the stems represent and how many stems would there be? 3.13 3.24 3.37 3.28 3.16 3.42 3.44 3.39 3.24 3.14 3.35 3.21 3.45 3.37 3.10 3.40

The heights of adult women have a bell-shaped distribution. Give an example of a data set whose distribution is likely to be right skewed. Explain why you think the distribution will be skewed to the right.

A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogramfor the systolic blood pressure readings for those people aged between 25 and 40. Use the histogram to answer thequestion. The blood pressure readings were given to the nearest whole number. -Given that 300 people were aged between 25 and 40, approximately how many had a systolic blood pressure reading less than 130?

Use cutpoint grouping to organize these data into a frequency distribution. -Kevin asked some of his friends how many hours they had worked during the previous week at their after-school jobs. The results are shown below. 6 6 6 4 6 6 9 8 6 4 8 6 6 8 6 6 8 6 6 8 6 8 8 4 Construct a frequency distribution. Use 4 classes, a class width of 2 hours, and a lower limit of 3 for the first class. Hours Frequency

The data in the following table represent heights of students at a highschool. Find the value of the missing entry. Height (centimeters) Relative frequency 142-under 152 0.03 152-under 162 0.21 162-under 172 0.27 172 -under 182 0.28 182 -under 192 192 -under 202 0.02

Use limit grouping to organize these data into a frequency distribution. -Lori asked 24 students how many hours they had spent doing homework during the previous week. The results are shown below. 10 11 10 8 10 10 14 12 10 9 12 11 11 12 10 11 12 10 11 12 11 12 12 8 Construct a frequency distribution. Use 4 classes, a class width of 2 hours, and a lower limit of 8 for the first class. Hours Frequency