
Module 2: Review of Basic Statistics and Hypothesis Testing
Quiz
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Information Technology (IT)
•
University
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Practice Problem
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Hard
Nwogu Caleb
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of descriptive statistics?
Answer explanation
Descriptive statistics are used to organize, summarize, and describe characteristics of a data set, such as frequencies, percentages, and measures of central tendency and dispersion.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is considered a measure of central tendency?
Answer explanation
Measures of central tendency, such as the mean, median, and mode, describe the center point or typical value of a data set. The mode represents the most frequently occurring value.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The mean is best defined as:
Answer explanation
The mean is calculated by summing all the values in a data set and dividing by the total number of values. It is the most common measure of central tendency.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a data set, the median is described as the:
Answer explanation
The median is the value that separates the higher half from the lower half of a data sample. It is the middle value when the data are ordered from smallest to largest.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When is the mode the most appropriate measure of central tendency to use?
Answer explanation
The mode is particularly useful for nominal or categorical data because it identifies the most frequent category or value. It can be used for any level of measurement but is most appropriate when other measures like the mean or median are not suitable.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which measure of central tendency is least affected by extreme scores (outliers)?
Answer explanation
The median is less sensitive to extreme values than the mean because it is based on the position of values rather than their sum.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does a measure of dispersion indicate about a data set?
Answer explanation
Measures of dispersion, such as range, variance, and standard deviation, describe how spread out or varied the data points are from the central value.
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