Lab 3 escriptive statistics
This lab has 3 parts. All 3 parts must be submitted as one document.
Part 1: Examining data
This activity closely aligns with ®8 from the OpenStax textbook
1. Randomly survey 30 classmates regarding the number of pairs of shoes they own. Record the
values below.
2. Calculate the following values
??? = ________________
?? = ______________
3. Are the data discrete or continuous? How do you know?
4. Construct a histogram, with five or six intervals, using StatCrunch. Attach a print out to your work.
5. Using complete sentences, describe the shape of the histogram you created in the previous
problem.
6. Are there any outliers? Justify your work using the mean and standard deviation of your data.
Show your calculations as well.
7. Find the five-number summary and IQR.
8. Use the IQR formula to determine the outliers.
9. Construct a boxplot of the data using StatCrunch. Attach a print out to your work.
Part 2: Skills practice
1. The test scores of 40 students are listed below. Find ??71 . What is the percentile of a score of 71?
31
58
68
86
33
58
71
88
36
58
72
89
37
59
72
89
39
60
72
95
45
62
78
95
47
63
79
96
48
65
79
96
49
67
81
96
52
68
81
98
2. A student earned grades of 84, 78, 84, and 72 on her essays in her freshman composition course.
She warned a grade of 78 on the final exam and 86 on her midterm. The sum of all her homework
assignment scores totaled 92. Her teacher gives the following weights to each grade category:
Homework counts for 10%; essays for 20%; the midterm counts for 30%; the final exam counts
for the remaining 40%.
What is this students weighted mean grade in this course?
3. Explain what it means for a set of data to have a standard deviation of 0. (Use complete, legible
sentences and appropriate statistics terminology.)
Part 3: Guided Notes check
As part of this online course, you are required to take notes while watching the videos. This is equivalent
to attending class. This week, attach the following pages to the lab:
Page 28
Page 33
Page 34
Page 37
Page 41

Purchase answer to see full
attachment