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Lab Statistics Week 2
Name: John Matias DSI:03156412__
Math221
Statistical Concepts:
Using MINITAB
Graphics
Shapes of Distributions
Descriptive Statistics
Empirical Rule
Data in MINITAB
MINITAB is a powerful, yet user-friendly, 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.
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.
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
Drive
State
Temp
Rank
Height
Shoe
Question
Question 1 How long does it take you to drive to the school on
average (to the nearest minute)?
Question 2 What state/country were you born?
Question 3 What is the temperature outside right now?
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?
Question 5 What is your height to the nearest inch?
Question 6 What is your shoe size?
Sleep
Gender
Race
Car
TV
Money
Coin
Die1
Die2
Die3
Die4
Die5
Die6
Die7
Die8
Die9
Die10
Question 7 How many hours did you sleep last night?
Question 8 What is your gender?
Question 9 What is your race?
Question 10 What color of car do you drive?
Question 11 How long (on average) do you spend a day watching
TV?
Question 12 How much money do you have with you right now?
Question 13 Flip a coin 10 times. How many times did you get tails?
Question 14 Roll a six-sided die 10 times and record the results.
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.
Pi e Cha r t of Ca r
w h ite
5.0%
Categ or y
b lack
b lu e
d ar k b lu e
g r een
o r ang e
r ed
silv er
w h ite
black
15.0%
silv er
25.0%
blu e
25.0%
r ed
10.0%
o r ang e
5.0%
2.
g r een
10.0%
dar k blu e
5.0%
Create a histogram for the variable Height Pull up Graph > Histograms Simple. and
choose 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.
Cha r l e s
7
6
Fr e que ncy
5
4
3
2
1
0
3.
62
64
66
68
70
He ight ( inche s)
72
74
Create a stem and leaf chart for the variable Money Pull up Graph > Stem-and
Leaf and set Variables: to Money. Enter 10 for the Increment: and click OK.
The leaves of the stem-leaf plot will be the ones digits of the values in the Money
variable. Note: the first column of the stem-leaf 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.
Stem-and-Leaf Display: Money
Stem-and-leaf of Money N = 20
Leaf Unit = 1.0
9
(3)
8
5
3
0
1
2
3
4
124456667
249
128
03
27
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.
Females
Mean
67.273
Standard deviation
2.533
Males
69.78
4.21
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.
The most common color is silver and Blue. The way I arrived at this answer is I grouped together the colors
to count how many.
6.
What is seen in the histogram created for the heights of students in this class (include
the shape)? Explain your answer.
Most of the data is on the right. Therefore it is Left-skewed.
7.
What is seen in the stem and leaf plot for the money variable (include the shape)?
Explain your answer.
Most of the data is on the left. Therefore it is Right-skewed.
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.
The females are shorter than males on average.
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.
The females heights are more disperse than the male heights. Therefore, there are more females taller and
shorter than the average, than there are males.
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.
Therefore 95% of the female heights fall within 62.207 and 72.339
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.
Therefore, 68% of the males heights fall within 65.57 and 73.99

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