Exam 3: Graphical Descriptive Techniques II

Which of the following statements describe(s)the line chart below?

Test scores The scores on a calculus test for a random sample of 40 students are as follows: 63 74 42 65 51 54 36 56 68 57 62 64 76 67 79 61 81 77 59 38 84 68 71 94 71 86 69 75 91 55 48 82 83 54 79 62 68 58 41 47 -Consider the following cumulative frequency distribution. Classes Limits Cumulative Frequency Frequency <5 11 <10 18 <15 24 <20 33 <25 45 Fill in the frequencies for each class in the above table.

Which of the following is true about a stem-and-leaf display?

A cumulative relative frequency distribution lists the number of observations that lie below each of the class limits.

Electronics Company At a meeting of regional offices managers of a national electronics company,a survey was taken to determine the number of employees the regional managers supervise in the operation of their departments.The results of the survey are shown below. Number of emplayees supervised 1 2 3 4 5 Frequency 7 11 14 10 -{Electronics Company Narrative} What proportion of managers supervise 3 employees?

Home Care Data are collected on the number of house calls (x)made in a given week by each of 60 nurses in a certain hospital.The same data set is displayed in each of the three histograms below. -{Home Care Narrative}Which graph do you think is the most appropriate display? Justify your answer.

We create a frequency distribution for interval data by counting the number of observations that fall into each of a series of intervals,called ____________________.

Test scores The scores on a calculus test for a random sample of 40 students are as follows: 63 74 42 65 51 54 36 56 68 57 62 64 76 67 79 61 81 77 59 38 84 68 71 94 71 86 69 75 91 55 48 82 83 54 79 62 68 58 41 47 -Fifty two truck buyers were asked to indicate the car dealer they believed offered the best overall service.The four choices were A,B,C,and D as shown below: Construct a table showing the frequencies and relative frequencies for this data set.What proportion of car buyers rated dealer D as the best?

Which of the following statements about histograms is true?

Teachers Ages The ages (in years)of a sample of 25 teachers are as follows: 47 21 37 53 28 40 30 32 34 26 34 24 24 35 45 38 35 28 43 45 30 45 31 41 56 -{Teachers Ages Narrative} Draw a frequency histogram of this data which contains six classes.What is the shape of the histogram?

Slopes and trends in a line chart appear to be less steep if you ____________________ the horizontal (time)axis.

Credit Hours The College of Business at The State University of California produced 3,400 credit hours during Spring Semester,2011he number and percentage of credit hours produced by each of the four departments in the College of Business is shown below. Department Percent Count Marketing 35.3 1.200 Management 23.5 800 Finance 23.5 800 Accounting 17.6 600 The following three-dimensional pie chart was constructed from the table above. -Samantha recorded her amount of exercise time (in minutes)for 100 days.Both of the line charts below were created based on her same data set.Which line chart makes her exercise times look more variable and why?

Insurance Company A representative from a local insurance agency selected a random sample of insured homeowners and recorded the number of claims made in the last three years,with the following results: Number of claims 0 1 2 3 4 5 Frequency 9 20 14 13 5 3 -{Insurance Company Narrative} How many total claims are represented in the sample?

Test scores The scores on a calculus test for a random sample of 40 students are as follows: 63 74 42 65 51 54 36 56 68 57 62 64 76 67 79 61 81 77 59 38 84 68 71 94 71 86 69 75 91 55 48 82 83 54 79 62 68 58 41 47 -{Test Grades Narrative} Describe the distribution of exam scores.

A skewed histogram is one with a long tail extending either to the right or left.

Experience shows that few students hand in their statistics exams early;most prefer to hand them in near the end of the test period.This means the time taken by students to write exams is positively skewed.

A stem-and-leaf display reveals more information about the original data than does a histogram.

A graph of the frequency distribution for interval data is called a(n)____________________.

How do you determine whether two interval variables have a positive linear relationship?

A line chart is created by plotting the values of the variable on the vertical axis and the time periods on the horizontal axis.