QMET 251 test 1 Questions and Answers Already Passed Latest Update 2025-2026
statistics - Answers the science dealing with the collection, organization, analyses,
interpretation and presentation of numerical facts
2 branches of statistics - Answers descriptive and inferential
descriptive statistics - Answers organizing and summarizing of data gathered on a group to
describe or reach conclusions about that same group (more basic)
2 types of descriptive statistics - Answers measures of central tendency and measures of
spread (dispersion)
measures of central tendency - Answers ways of describing the central position of a frequency
distribution for a group of data
measures of spread (dispersion) - Answers ways of summarizing a group of data by describing
how spread out the data is
inferential statistics (inductive) - Answers process of gathering data from a sample and using
the statistics gathered to reach conclusions about the population from which the sample was
taken
population - Answers collections of persons, objects, or items of interest (defined by areas of
interest)
census - Answers gathering data from whole population for a given measurement of interest
sample - Answers a portion go the whole. representation of the whole.
sample mean/population mean - Answers equal to the sum of all the values in the data set
divided by the number of values in the data set
sample mean/population mean formula - Answers Ex/n
properties of the mean:
1. every value in the data set is __ - Answers 1. included in computing the mean
properties of the mean:
2. each set of data has a __ mean. the mean is effected by usually __ or __ data values (outliers)
- Answers 2. unique. small, large
stat rules:
organized data in an __ fashion from __ to __ - Answers arrayed. smallest, largest
, outliers - Answers values that are unusual compared to the rest of the data set, being especially
large or small in numerical value
the median - Answers the exact middle value in an ordered array or numbers. basically the cut
off point between upper an lower 50% of data.
properties of the median:
1. there is a __ median for each set of data - Answers unique
properties of the median:
2. the median __ effected by outliers and there is therefore a ___ measure if central tendency
occurs - Answers is not; valuable
the __ is best for symmetric distributions without outliers - Answers mean
the __ is useful for skewed distributions or data with outliers - Answers median
the mode - Answers most frequently occurring value in a distribution
bimodal distribution - Answers when you have 2 modes
multimodal distribution - Answers when you have more than 2 modes
symmetrical distribution - Answers you have zero skewness
skewness - Answers a distribution is asymmetrical, or lacks symmetry
in any skewed distribution you can always assume there will be __ - Answers outliers
skewed left, __ skew - Answers negative
skewed right, __ skew - Answers positive
skewed left and negative skew, you have a lot of __ numbers and a few __ numbers (bc it is far
from zero) - Answers big, small
skewed right and positive skew, you have a lot of __ numbers and a few __ numbers (bc it is
close to zero) - Answers small, big
sales at hebert's specialty meats- as the owner you want a __ skew bc you want __ numbers -
Answers negative, large
wait time at judice inn- from the customer's view you want a __ skew bc you want __ numbers -
Answers positive, small
test grades- you want a __ skew - Answers negative
statistics - Answers the science dealing with the collection, organization, analyses,
interpretation and presentation of numerical facts
2 branches of statistics - Answers descriptive and inferential
descriptive statistics - Answers organizing and summarizing of data gathered on a group to
describe or reach conclusions about that same group (more basic)
2 types of descriptive statistics - Answers measures of central tendency and measures of
spread (dispersion)
measures of central tendency - Answers ways of describing the central position of a frequency
distribution for a group of data
measures of spread (dispersion) - Answers ways of summarizing a group of data by describing
how spread out the data is
inferential statistics (inductive) - Answers process of gathering data from a sample and using
the statistics gathered to reach conclusions about the population from which the sample was
taken
population - Answers collections of persons, objects, or items of interest (defined by areas of
interest)
census - Answers gathering data from whole population for a given measurement of interest
sample - Answers a portion go the whole. representation of the whole.
sample mean/population mean - Answers equal to the sum of all the values in the data set
divided by the number of values in the data set
sample mean/population mean formula - Answers Ex/n
properties of the mean:
1. every value in the data set is __ - Answers 1. included in computing the mean
properties of the mean:
2. each set of data has a __ mean. the mean is effected by usually __ or __ data values (outliers)
- Answers 2. unique. small, large
stat rules:
organized data in an __ fashion from __ to __ - Answers arrayed. smallest, largest
, outliers - Answers values that are unusual compared to the rest of the data set, being especially
large or small in numerical value
the median - Answers the exact middle value in an ordered array or numbers. basically the cut
off point between upper an lower 50% of data.
properties of the median:
1. there is a __ median for each set of data - Answers unique
properties of the median:
2. the median __ effected by outliers and there is therefore a ___ measure if central tendency
occurs - Answers is not; valuable
the __ is best for symmetric distributions without outliers - Answers mean
the __ is useful for skewed distributions or data with outliers - Answers median
the mode - Answers most frequently occurring value in a distribution
bimodal distribution - Answers when you have 2 modes
multimodal distribution - Answers when you have more than 2 modes
symmetrical distribution - Answers you have zero skewness
skewness - Answers a distribution is asymmetrical, or lacks symmetry
in any skewed distribution you can always assume there will be __ - Answers outliers
skewed left, __ skew - Answers negative
skewed right, __ skew - Answers positive
skewed left and negative skew, you have a lot of __ numbers and a few __ numbers (bc it is far
from zero) - Answers big, small
skewed right and positive skew, you have a lot of __ numbers and a few __ numbers (bc it is
close to zero) - Answers small, big
sales at hebert's specialty meats- as the owner you want a __ skew bc you want __ numbers -
Answers negative, large
wait time at judice inn- from the customer's view you want a __ skew bc you want __ numbers -
Answers positive, small
test grades- you want a __ skew - Answers negative
