Exam 3: Graphical Descriptive Techniques II

Which of the following is the method statisticians use to draw the best fitting straight line through the data on a scatter diagram?

In a histogram,each observation is assigned to one or more classes.

Can a scatter diagram be used to explore the relationship between two nominal variables? Explain why or why not.

Observations that are taken during successive points in time are called ____________________ data.

The graph below represents a line graph.

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 histogram makes the differences in the house calls appear to be the most dramatic?

The number of observations within each class may be found in a frequency distribution.

Internet Classes A survey of 25 students was conducted to determine how they rate the quality of Internet classes.Students were asked to rate the overall quality from 0 (no quality at all)to 100 (extremely good quality).The stem-and-leaf display of the data is shown below. Stem Leaves 3 15 4 01457889 5 0134677 6 24568 7 29 8 9 5 -{Internet Classes Narrative} What percentage of the students rated the overall quality of on-line classes as being below 40?

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 stem-and-leaf display of this data.What is the minimum and maximum age of the teachers in this data set?

The line chart below shows potato prices per pound for each month from January (month 1)to December last year.By looking at this chart you can see the lowest potato prices occurred in ____________________.

A department store's monthly sales (in thousands of dollars)for the last year were as follows.A histogram should be used to present these data. Month 1 2 3 4 5 6 7 8 9 10 11 12 Sales 78 74 83 87 85 93 100 105 103 89 78 94

The two most important characteristics to examine in a scatter diagram are the number of possible categories for X and Y and the number of observations in each category.

A modal class in a histogram is the class that includes

A relative frequency distribution describes the proportion of data values that fall within each category.

Which of the following represents time-series data?

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 histogram makes the differences in the house calls appear to be the least dramatic?

Observations that are measured at the same time are called ____________________ data.

The sum of cumulative relative frequencies always equals 1.

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} What proportion of homeowners had no claims in the last three years?

According to the stem-and-leaf plot below,this data set has a negative median. Stem-and-leaf of P/E ratio; N=75 Leaf Unit = 0.01 1 -2 6 2 -2 0 5 -1 555 8 -1 420 22 -0 9999988777665 36 -0 443221111111000 (14) 0 01122233333344 25 0 6667889999 14 1 0022222334 4 1 56 2 2 03