Statistics Unit test. Connexus

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Question 1: What is the definition of mean in statistics?

a) The middle value of a data set
b) The most frequently occurring value in a data set
c) The sum of all values in a data set divided by the number of values
d) The difference between the highest and lowest values in a data set

Answer: c) The sum of all values in a data set divided by the number of values

Question 2: Which of the following measures of central tendency is most affected by outliers in a data set?

a) Mean
b) Median
c) Mode
d) Range

Answer: a) Mean

Question 3: What is the range of the following data set: 5, 10, 15, 20, 25?

a) 20
b) 25
c) 15
d) 5

Answer: a) 20

Question 4: In a box-and-whisker plot, the median is represented by:

a) The line in the middle of the box
b) The lower quartile
c) The upper quartile
d) The line dividing the box in half

Answer: d) The line dividing the box in half

Question 5: What does the standard deviation measure in a data set?

a) The spread or dispersion of the data
b) The average of the data
c) The most frequently occurring value
d) The difference between the highest and lowest values

Answer: a) The spread or dispersion of the data

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