statistics

nominal

-qualitative data only -categorized using names, labels, or qualities -no mathematical computations can be made -names

ordinal

-qualitative or quantitative data -data can be arranged in order, or ranked -differences between data entries is not meaningful

interval

-quantitative data -data can be ordered -differences between data entries is meaningful -zero represents a position on a scale

What is the difference between class limits and class​ boundaries?

Class limits are the least and greatest numbers that can belong to the class. Class boundaries are the numbers that separate classes without forming gaps between them. For integer​ data, the corresponding class limits and class boundaries differ by 0.5.

what is an ogive graph

a cumulative frequency graph

What is the difference between an observational study and an​ experiment?

In an​ experiment, a treatment is applied to part of a population and responses are observed. In an observational​ study, a researcher measures characteristics of interest of a part of a population but does not change existing conditions.

what question would be appropriate to ask? A-how do you think eating eggs affects you health? B-why is eating eggs good for you? C-do you think that eating eggs is good for you D-do you think that eating eggs is bad for you? E-the original question is not biased

A- how do you think eating eggs affects your health?

what is the class width of a frequency distribution

the class width is the distance between the lower and upper limits of consecutive classes

what does f stand for

the frequency (f) of a class is the number of data entries in the class

why is eating bread bad for you? Is this statement biased?

yes-leads you to thinking it is bad to eat

descriptive statistic

absolute fact with no opinion

After constructing a relative frequency distribution summarizing IQ scores of college​ students, what should be the sum of the relative​ frequencies?

if percentages are used, the sum should be 100%. If proportions are used, the sum should be 1.

what are some benefits of using graphs of frequency distributions

it can be easier to identify patterns of a data set by looking at a graph of the frequency distribution

research is conducted to determine if there is a relation between kidney function in adults and childhood-onset diabetes: does the description correspond to an observational study or an experiment?

observational study

what levels of measurement can data be qualitative

ordinal and nominal

What are some benefits of representing data sets using frequency​ distributions?

organizing the data into frequency distribution can make patterns within the data more evident

ratio

-similar to interval level -zero entry is an inherent zero ( none) -a ratio of two data values can be formed -one data value can be expressed as a multiple of another

frequency distribution

a table that shows classes or intervals of data with a count of the number of entries in each class