Stats 2

what are the boundaries of the class 1.87-3.43?

1.865-3.435

what are the boundaries of class 11-17?

10.5 and 17.5

what is lower class limit of the class 13-17?

13

If a frequency distribution had class boundaries of 132.5-147.5, what would be the class width?

15

In an ungrouped frequency distribution of the average age of high school graduates, what would be the boundaries for the class of graduates who were reported to be 18 years old?

17.5 - 18.5 years old

for the class 10-20, the upper class limit is

20

what is the midpoint of the class 7-11?

9

which of the following pairs of class limits would be appropriate for grouping the numbers 13, 16, 11, and 18? a.) 11-13 and 14-18 b.) 11-14 and 15-18 c.) 11-13 and 16-18 d.) 10-14 and 14-18

b.) 11-14 and 15-18

which of the following does not need to be done when constructing a frequency distribution? a.) select the number of classes desired b.) use classes that are mutually exclusive c.) make the class width an even number d.) find the range

c.) make the class width an even number

Greg wants to construct a frequency distribution for the political affiliation of the employees at Owen's Hardware Store. What type of distribution would be best?

categorical

Thirty students recorded the colors of their eyes, choosing from the colors brown, blue, green, hazel, and black. This data can be appropriately summarized in a

categorical frequency distribution

For a given data set, the ogive and the frequency polygon will have the same overall shape, T or F

false

The ______ of a specific class is the number of data values contained in it

frequency

the three most commonly used graphs in research are the histogram, the __________, and the cumulative frequency graph (ogive)

frequency

When the range is large and classes that are several units in width are needed, a __________ frequency distribution is used.

grouped

When data are collected in original form, they are called __________.

raw data

graphs the show distribution using proportions instead of raw data as frequencies are called _______________ _____________ _________

relative frequency graphs

If the graph of a frequency distribution has a peak and the data tapers off more slowly to the right and more quickly to the left the distribution is said to be ____________________

right-skewed

An ogive is also called a cumulative frequency graph. T or F

true

for the class 16.3-23.8, the width is 8.5, T or F

true

the cumulative frequency for a class is the sum of the frequencies of the classes less than and equal to the upper boundary of the specific class, T or F

true

the frequency polygon and the histogram are two different ways to represent the same data set, T or F

true

the frequency polygon is a graph that displays the data by using lines that connect point plotted for the frequencies at the midpoint of the classes. T or F

true