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Quiz #1 STA2023 Stemplots and Histograms
Write your quiz up on a separate piece of paper with your name, date, course
registration number, and the time and days that you attend the class. Show all work for
full credit. Your submitted quiz should be neat, clear and detailed. It should not be a
rough draft. When in doubt, include as much relevant, correct information pertaining to
your answer as possible. Remember, start early and seek out help if you “get stuck.”
1. (5 pts.) The following are the calorie contents of 17 different brands of meat hot
dogs.
173
191
182
190
172
147
146
139
175
136
179
153
107
195
135
140
138
Make a stemplot of the variable Calorie. It should have a “class width” of 10.
The digits (leaves) should be in order.
2. (6 pts.) On the back of this page are the Test #1 scores for Pat Murphy’s STA
2023 statistics class of Spring semester 2005. Make a frequency histogram of the
data. Choose a class width of 7.5 starting with a lower class limit of 0. An
asterisk (*) means that no score was recorded for that student. Give the graph a
title and label the axes appropriately. How many test scores are between 45 and
under 60?
a. (3 pts.) Which class has the highest frequency and what is this frequency?
b. (3 pts.) What is the exact range of the data? Can we get the exact value of the
range by looking only at the histogram? Why or why not?
c. (3 pts.) Does the graph follow a pattern? (symmetric, skewed right, skewed
left, bimodal, uniform, etc.)
d. (3 pts.) Does there appear to be any outliers? If so what are they?
3. (2 pts.) Suppose that you and your friends emptied pockets of coins and recorded
the year marked on each coin. The distribution of the dates would be skewed left.
Explain why…
