Statistics – Lab Week 2
Name:_______________________
Math221
Statistical Concepts:
·
Using MINITAB
·
Graphics
·
Shapes of Distributions
·
Descriptive Statistics
·
Empirical Rule
Data in MINITAB
Ø MINITAB is a
powerful, yet userfriendly, data analysis software package. You can launch
MINITAB by finding the icon and double clicking on it. After a moment you will
see two windows, the Session Window in the top half of the screen and the
Worksheet or Data Window in the bottom half.
Ø Data have already
been formatted and entered into a MINITAB worksheet. Go to the eCollege Doc
sharing site to download this data file. The names of each variable from the
survey are in the first row of the Worksheet. This row has a background color
of gray to identify it as the variable names. All other rows of the MINITAB
Worksheet represent a certain students’ answers to the survey questions.
Therefore, the rows are called observations and the columns are called
variables. Included with this lab, you will find a code sheet that identifies
the correspondence between the variable names and the survey questions.
Ø Complete the
answers below and paste the answers from MiniTab below each question. Type your answers to the questions where
noted. Therefore, your response to the
lab will be this ONE document submitted to the dropbox.
Code Sheet
Variable Name

Question

Drive

Question 1 – How long does it take you to drive to the school on
average (to the nearest minute)?

State

Question 2 – What state/country were you born?

Temp

Question 3 – What is the temperature outside right now?

Rank

Question 4 – Rank all of the courses you are currently taking. The
class you look most forward to taking will be ranked one, next two, and so
on. What is the rank assigned to this class?

Height

Question 5 – What is your height to the nearest inch?

Shoe

Question 6 – What is your shoe size?

Sleep

Question 7 – How many hours did you sleep last night?

Gender

Question 8 – What is your gender?

Race

Question 9 – What is your race?

Car

Question 10 – What color of car do you drive?

TV

Question 11 – How long (on average) do you spend a day watching TV?

Money

Question 12 – How much money do you have with you right now?

Coin

Question 13 – Flip a coin 10 times. How many times did you get tails?

Die1

Question 14 – Roll a sixsided die 10 times and record the results.

Die2

Die3

Die4

Die5

Die6

Die7

Die8

Die9

Die10

Creating Graphs
1.
Create a Pie Chart for the variable Car – Pull up Graph > Pie Chart and click in the
categories variables box so that the list of variables will show up on the
left. Now double click on the variable
name ‘Car” in the box at the left of the window. Include a title by clicking on
the “Labels…” button and typing it in the correct text area (put your name in
as the title) and click OK. Click OK
again to create graph. Click on the
graph and use Ctrl+C to copy and come back here, click below this question and
use Ctrl+V to paste it in this Word document.
2. Create a
histogram for the variable Height – Pull up Graph > Histograms and choose “Simple”. Then set the graph variable to “height”.
Include a title by clicking on the “Labels…” button and typing it in the
correct text area (put your name in as the title) and click OK. Copy and paste the graph here.
3. Create a stem and
leaf chart for the variable Money – Pull up Graph > Stemand Leaf and set Variables: to “Money”. Enter 10 for the Increment: and click OK.
The leaves of the stemleaf plot will be
the one’s digits of the values in the “Money” variable. Note: the first column of the stemleaf plot
that you create is the count. The row
with the count in parentheses includes the median. The counts below the median cumulate from the
bottom of the plot.
Copy and paste the graph here.
Calculating Descriptive
Statistics
4.
Calculate descriptive statistics for the variable
Height by Gender – Pull up Stat >
Basic Statistics > Display Descriptive Statistics and set Variables: to Height. Check By variable: and enter Gender into this
text box. Click OK. Type the mean and the standard deviation for
both males and females in the space below this question.

Mean

Standard deviation

Females



Males



Ø Select File
> Save Worksheet As to save the data set. You must either keep a copy of
this data or download it again off the web site for future labs.
Short Answer Writing
Assignment
All answers should be
complete sentences.
5.
What is the most common color of car for students
who participated in this survey? Explain how you arrived at your answer.
6. What is seen in
the histogram created for the heights of students in this class (include the
shape)? Explain your answer.
7. What is seen in
the stem and leaf plot for the money variable (include the shape)? Explain your
answer.
8. Compare the mean
for the heights of males and the mean for the heights of females in these data.
Compare the values and explain what can be concluded based on the numbers.
9. Compare the standard
deviation for the heights of males and the standard deviation for the heights
of females in the class. Compare the values and explain what can be concluded
based on the numbers.
10. Using the
empirical rule, 95% of female heights should be between what two values? Either
show work or explain how your answer was calculated.
11. Using the
empirical rule, 68% of male heights should be between what two values? Either
show work or explain how your answer was calculated.