Exam 2: Visual Description of Data

The following stem-and-leaf output has been generated by Minitab. Stem-and-leaf of C2 $\quad \mathrm { N } = 10$ Leaf Unit $= 0.10$ 2 -153 4 -097 (2) -065 4 03 3 06 2 13 1 18 Which of the following statements are correct?

Compared to the frequency distribution,the stem-and-leaf display provides more detail since it can describe the individual data values as well as show how many are in each group,or stem.

Voters participating in a recent election exit poll in Michigan were asked to state their political party affiliation.Coding the data 1 for Republican,2 for Democrat and 3 for Independent,the data collected were as follows: 3,2,3,2,1,1,3,2,1,3,1,2,3,1,3,3,3,3,2,1,1,3,2,3,1 Construct a frequency bar chart.

What is a scatter diagram,and for what kind of data is it a useful descriptive device?

Raw data are converted to frequency distributions and visual displays that provide us with a "big picture" of the information collected.

When some of the variables represent categories,we can apply a useful summarization method called tabulation,where we simply count how many people or items are in each category or combination of categories.

A friend has constructed the following frequency distribution of test scores in his business statistics class: Score Number af Students 40 and below 2 40-50 6 50-60 8 60-70 13 70-80 11 80-90 5 90 and above 4 He asks for your feedback.What advice would you give him?

The following table represents exam grades from 36 students in a statistics class.Construct a pie chart using classes with grades 51-60,61-70,71-80,81-90,and 91-100. 60 79 75 84 85 74 95 58 66 98 99 99 62 86 85 99 79 82 98 72 72 72 75 88 86 81 96 86 78 91 83 85 92 68

In cross-tabulation:

What is the difference between a histogram and a bar chart? For what type of data would each be appropriate?

The grades on a chemistry exam for a sample of 40 students are as follows: 47 82 83 54 79 62 68 58 41 48 84 68 71 91 71 86 69 75 94 55 62 64 67 76 79 61 81 77 59 38 57 74 42 56 51 54 36 65 68 63 Estimate the percentage of grades that are between 80 and 90.

The midway point between the upper and lower class limits for a frequency distribution is known as the:

The ____________________ a variant of the frequency distribution,uses a subset of the original digits in the raw data as class descriptors and class members.

A stem-and-leaf display describes two-digit integers between 20 and 80.For one of the classes displayed,the row appears as 5|246.What numerical values are being described?

The ____________________ is a diagram in which each point represents a pair of known or observed values of two variables.

The relative frequency distribution describes the

A frequency distribution is a(n):

A recent Wall Street Journal survey found that 523 Democrats and 765 Republicans and believe legal immigration has a positive effect on the Untied States.Display this data in a bar chart.

When variables are used as the basis for a cross-tabulation,what scale of measurement must they represent?

In a __________,we can generate a display that describes how a selected qualitative variable tends to differ from one category to another.