Data Terms
Which of the following is a statistical question?
a) When is Halloween?
b) How many pieces of candy did you get?
c) What house has the best decorations?
d) How many students dressed up in each class?
d) "How many students dressed up in each class?" is a statistical question because it would generate more than one piece of numerical data.
Find the mode of the following data:
Number of Houses Visited By Trick-or-Treaters: 24, 15, 0, 21, 15, 10, 14, 10, 8, 12, 37.
The mode is 10 houses AND 15 houses. It's bi-modal!
How many observations were made in the data displayed by the dot plot in figure 1?
The dot plot shows 20 observations.
According to the histogram in Fig. 2, how many student had a score between 80 - 100.
30 students had a score between 80 - 100.
What is the median number of pencils according to the box plot in fig. 3?
The median number is 4 pencils..
What are the three measures of center?
Mean, median and mode are the measures of center.
Find the range of the following data:
Math Test Scores: 90, 83, 98, 74, 84, 77, 69, 92
The range is 29 points.
What does each x represent in the dot plot in figure 1?
Each dot represents one book read.
How many students scored less than 60 in the histogram on Fig. 2?
90 students had a score less than 60.
What is the range of the number of pencils shown in the box plot in fig. 3?
The pencils have a range of 12.
Range and interquartile range (IQR) are both considered measures of... what?
Range and interquartile range are both considered measures of variation.
Find the median of the following data:
Time Spent Studying: 60, 30, 15, 20, 15, 25, 0
The median is 20 minutes.
What is the shape of the data displayed on the dot plot in figure 1?
The data in figure 1 appears to be skewed right.
Based on the histogram in Fig. 2, what was the range of exam scores?
The exact range cannot be found using the histogram in Fig. 2.
What is the interquartile range seen in fig. 3 (box plot)?
The interquartile range is 4 .
What term is used to describe a data point that is far away from the rest of the data set and can often skew the data?
An outlier.
Find the median of the following data:
Money Spent on Costumes: 21, 16, 50, 0, 12, 24
The median is $18.50.
What is the range of the data displayed in figure 1?
The range is 9.
How many more students scored between 60-80 than between 20 - 40?
There were 70 more students that scored between 60-80.
What percentage of the students have greater than 6 pencils on their desk?
25% of the students have 6 or less pencils on their desk
Both dot plots and histograms display data by making vertical stacks. These stacks show the amount of observations in each column, also known as... what?
The amount of observations in each column is also called the frequency.
Find the mean of the following data:
Temperatures in October: 65, 63, 70, 63, 61, 59
The mean, or average, temperature in October was 63.5 degrees.
What is the mean of the data displayed on the dot plot in figure 1?
The mean is 2.6
How many exam scores are in the histogram in fig. 2.
There are 210 scores.
What percentage of the data in fig 3 is less than 6?
75%