Download Assignment 1 statistics 2012

Assignment 1
By: Scott McNeil
1.2 Qualitative or Quantitative?
A) The amount of time it takes to assemble a simple puzzle is an example of quantitative data.
B) The number of students in a first-grade classroom is also an example of quantitative data.
C) Rating of a newly elected politician is an example of qualitative data.
D) Province or territory in which a person lives is also an example of qualitative data.
1.10
A) The experimental unit is the people.
B) The variable being measured is the number of people in each category. It is quantitative
because it’s a measurable number.
C)
Frequency of Category
D
5, 10.0%
A
11, 22.0%
C
20, 40.0%
B
14, 28.0%
C ategory
A
B
C
D
D)
Bar Chart of Frequency
20
Frequency
15
10
5
0
A
B
C
D
Category
E) The shape of the graph does change if the categories were changed around. The data is bell
shaped as is but if D and A were first followed by C and B the graph would be skewed left. The
order of presentation is very important because it changes the shape and possibly the type of
graph used.
F)
Category B = 28% with 14 people
B=14, Total=50, (14/50) = (0.28)
G) [(11+20+5)/50]100
= [(36)/50]100
= (0.72)100
=72%
72% of the people are not in category B.
1.26
A)
Histogram of TIME
14
12
Frequency
10
8
6
4
2
0
0
8
16
TIME
24
32
B) The data is skewed right.
C)
1.34
A)
Chart of RBC Count
5
Count
4
3
2
1
0
4.9
5.0
5.1
5.2
RBC Count
5.3
5.4
5.5
B) The bar graph is skewed left.
C) If the person’s red blood cell count was measured at 5.7 it would be in the usual range. The
standard deviation is 0.1595. The person may have exercised before having their blood taken
causing them to be dehydrated, which makes your red blood cell count go up.
1.42
A) The number of people in line at the supermarket is a discrete variable.
B) Depth of a snowfall is a continuous variable.
C) Length of time for a driver to respond when faced with an impending collision is a continuous
variable.
D) Number of aircraft arriving at the airport in a given hour is a discrete variable.
Project 1-B
A) The experimental units are the high school students.
B) The variable being measured is how long they wash their hands.
C) The variable is quantitative, since it’s a given time.
D) The variable is discrete.
E)
Dotplot of Time Washing Hands(S)
0
3
6
9
12
Time Washing Hands(S)
15
18
Most of the students wash their hands for 5 seconds. All of the students wash their hands
between 0- 20 seconds. Two students didn’t wash their hands at all.
F) The data seems to be skewed to the right. 68% of the students washed their hands between 410 seconds.
G) I would use the number of students on the X axis and the time spent washing their hands on
the Y axis.
H)
Histogram of Time Washing Hands(S)
9
8
Frequency
7
6
5
4
3
2
1
0
I)
0
5
10
Time Washing Hands(S)
15
20
17/25= 0.68
17/25 students washed theirs hands for less than 10 seconds.
J) 24/25= 0.96
24/25 students washed their hands for at least 5 seconds.
K) I cannot state that most students wash their hands for 5 seconds or less because only 9/25 do.
That’s only 36%. The mean is 8.28. I could comfortably state that on average they wash their
hands for 8.28 seconds.
L)
0 00
0
0 4455555
0 6677
0 8899
1 001
1 3
1 5
1 6
1 9
2 0
M) The data looks skewed to the right. 18/25= 72% of the data falls between 4-11.
N) The two students who didn’t wash their hands and the student who washed them for 20
seconds seem to be outliers.
2.12
A) The average price of the top ten TV’s $812.
B) The median price is $725.
C) The average price would give you a rough estimate of the expected cost. I would also be
interested in the specifications of each TV. The variables that would interest me most from this
list would be mean and size of the TV.
C)
B) The mean is 3.136
The standard deviation is 2.866.
Harper, Steven
Martin, Paul
Chretien, Jean
Campbell, Kim
Mulroney, Brian
Turner, John N.
Clark, CJoeseph
Trudeau, Pierre Elliot
Pearson, Lester B.
Diefenbaker, John D.
Saint-Laurent, Louis Stephen
Bennett, Richard Bedford
King, William Lyon Mackenzie
Meighen, Arthur
Borden, Robert L.
Laurier, Wilfred
Tupper, Charles
Bowell, Mackenzie
Thompson, John S. D.
Abbott, John J.
MacKenzie, Alexander
MacDonald, Sir John A.
2.34
A) The data shape is skewed on the right.
Children
10
9
8
7
6
5
4
3
2
1
Children
0