Exam 3: Graphical Descriptive Techniques II

NARRBEGIN: TeachersAges 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 NARREND -{Teachers Ages Narrative} Construct an ogive for this data. Estimate the proportion of salespersons that are: 1) under 30 years of age; 2) 40 years of age or over; and 3) between 40 and 50 years of age.

NARRBEGIN: Test scores 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 NARREND -Forty 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: A C C C D C B A C D A B C A B C B A C B B C B B A C A C C A D B B C C A C D B A D C D A B B C D A B D A Construct a table showing the frequencies and relative frequencies for this data set. What proportion of car buyers rated dealer D as the best?

NARRBEGIN: Home Care 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. NARREND -Compare the two histograms below. Which statement is true?

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

NARRBEGIN: Home Care 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. NARREND -Observations that are taken during successive points in time are called ____________________ data.

NARRBEGIN: Home Care 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. NARREND -The sum of relative frequencies in a distribution always equals 1.

NARRBEGIN: Test scores 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 NARREND -{Test Grades Narrative} Construct a stem-and-leaf display for this data set. Describe the shape of the data.

NARRBEGIN: Home Care 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. NARREND -A line chart that is flat shows no fluctuation in the variable being presented.

NARRBEGIN: Test scores 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 NARREND -{Test Grades Narrative) Construct an ogive for this data set. Use the ogive to estimate the proportion of exam scores that are between 80 and 90.

NARRBEGIN: Home Care 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. NARREND -Data for calories and salt content (milligrams of sodium) in 17 brands of meat hot dogs are shown in the scatter diagram below. According to this diagram, it appears that hot dogs that are high in sodium are generally low in calories, and hot dogs with low sodium are generally high in calories.

NARRBEGIN: Home Care 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. NARREND -The intervals (classes) in a histogram are equally wide.

NARRBEGIN: Home Care 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. NARREND -The more observations we have, the ____________________ the number of class intervals we need to use to draw a useful histogram.

NARRBEGIN: Home Care 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. NARREND -Which of the following is true about a stem-and-leaf display?

NARRBEGIN: Home Care 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. NARREND -Which of the following is the method statisticians use to draw the best fitting straight line through the data on a scatter diagram?

NARRBEGIN: Home Care 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. NARREND -Compare the spread of the two histograms below. Which of the following is true?

NARRBEGIN: TeachersAges 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 NARREND -{Teachers Ages Narrative} Draw a stem-and-leaf display of this data. What is the minimum and maximum age of the teachers in this data set?

NARRBEGIN: Home Care 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. NARREND -Time-series data are often graphically depicted how?

NARRBEGIN: Home Care 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. NARREND -A(n) ____________________ histogram has two peaks, not necessarily equal in height.

NARRBEGIN: Home Care 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. NARREND -If when one variable increases the other one also increases, we say that there is a(n) ____________________ relationship between these two variables.

NARRBEGIN: Test scores 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 NARREND -{Test Grades Narrative} Describe the distribution of exam scores.