*USED R-STUDIO FOR ANYTHING WITHOUT WORKINGS*
1. P [x>81] = P[z>(81-65)/8]
= P[z>2]
= 0.025
Approximately 2.5% would be above 81 from the normal table.
2a. P [x 91] = 0.9878
= 98.78%
b. P [65 < x < 98] = P [x < 98] - P [x 65]
= 0.9991 - 0.1586
= 0.8405
=
1. The major contribution of inferential statistics is: (b) allowing us to take sample information
and make statements about populations.
2. Which of the following statements about the sampling distribution of the sample mean is
incorrect? : (d) The stand
What to know
Chapter 1
Chapter 2
Type of data
quantitative and
qualitative
Central tendency
mean, median, mode
Variation
range, variance,
standard deviation
Shape
Skewed and symmetric
Z score
Chebyshevs theorem and
empirical rule
Chapter 3 Proba
Memorial University of Newfoundland
Department of Mathematics and Statistics
Statistics 2500-001, Statistics for Business and Economics, Winter 2014
COURSE INFORMATION:
Slot: 20 (Tuesdays & Thursdays 3:30 — 4:45 pm) Room: ED 1020
Instructor: Mohinder Gr
MEMORIAL UNIVERSITY OF NEWFOUNDLAND
Department of Mathematics and Statistics
_
Assignment #1
STAT 2500
W14
_
1. 10 students are randomly sampled. Their ages are shown in the data set.
23, 22, 19, 26, 22, 20, 20, 21, 18, 49
(a) Compute the sample range, sa
Statistics is more thanjust numbers - it is what is done to or with numbers.
§tatisxics is the science of collecting. classifying. presenting, and interpreting numerical
data. L
Data: The set of values collected for the variable from each of the elements
Memorial University of Newfoundland
Department of Mathematics and Statistics
STAT 2500 - Statistics for Business and Arts Students
Model Midterm Exam - Fall 2015
Name:
Student No.:
OFFICE USE ONLY
Mark:
Instructions
1. Please PRINT your name in the format
STAT 2500-Statistics for Business and Arts students-Winter 2016
Solutions for Assignment #2
Q1. (a) The histogram of the price of refrigerator as follows
2
0
1
Frequency
3
4
Histogram of Price
500
600
700
800
900
1000
1100
Price
(b) The shape of the distr
MEMORIAL UNIVERSITY OF NEWFOUNDLAND
Department of Mathematics and Statistics
Quiz #4 Solution
STAT 2501
Name:
Fall 2013
Student No.:
Questions
1. In a multiple regression study with 43 observations of 4 predictor variables, an analyst is
considering wheth
MEMORIAL UNIVERSITY OF NEWFOUNDLAND
Department of Mathematics and Statistics
Quiz #5 Solution
STAT 2501
Name:
Fall 2013
Student No.:
Questions
1. When applying the Wilcoxon signed rank test, the number of ties should be small relative
to the number of obs
MEMORIAL UNIVERSITY OF NEWFOUNDLAND
Department of Mathematics and Statistics
Assignment #2 Solution
STAT 2501
F12
1. A rst-order linear regression model with 6 explanatory variables was t to a data set of
30 observations. Complete the following ANOVA tabl
MEMORIAL UNIVERSITY OF NEWFOUNDLAND
Department of Mathematics and Statistics
Assignment #3 Solution
STAT 2501
F12
1. Suppose 15 employees with ages listed in the table:
43 32 39
28
54
41 50 62
22
45
47
54 43 33
59
Does median age of terminated employees e
Student ID: -
PROBLEM #3: (10 Marks)
Pair of Ice Tongs is shown below. The ice cube weighs 50lb and is 10in wide across the tongs.
The distance between the handles is 4in and the mean radius r is 6in. Draw the free body diagram
and find all the forces act
Student ID: -PROBLEM #2: (5 Marks)
The piston of an IC engine is connected to its connecting rod with a writs pin. The force on the
wrist pin is 2750lb. Design the wrist pin (the internal diameter) for a maximum allowable force
of 20Ksi, if the pin is hol
Statistics 3540
Assignment #1: Solutions 30 POINTS
1. Problem on the sampling distribution of x.
NOTE: No computer output is required in the solutions. Also, not everyone will have the
same results, since the values are randomly generated.
(a) From the ou
Statistics 3540
Assignment #2: Solutions
1. Find least squares estimate of 1 in
yi = 1 x2 + ei
i
Solution: Dene SS(1 ) =
i (yi
1 x2 )2 . Then
i
dSS(1 )
= 2
d(1 )
x2 (yi
i
1 x2 )
i
x2 (yi 1 x2 ) = 0
i
i
i
= 0
i
x4 =
i
1
x2 yi
i
i
i
1 =
i
x2 yi
i
x4
i i
Te
Statistics 3540
Assignment #4: Solutions
1. Use the unemployment data from Assignment #3 to answer the following:
(a) Analyze the data by using the multiplicative decomposition method. Make sure
to comment on any features you see in the plots of (i) the d
Statistics 3540
Assignment #3: Solutions
1. Refer back to the DJIA data used in Assignment #2, and answer the following:
(a) Fit the regression model
yt = 0 + 1 t + 2 t2 +
t
See output below.
The regression equation is
DJIA = 1150 - 124 Time + 9.51 Timesq
Tl) o QA N
Statistics 2500 (001)
Quiz #1 Oct. 59, 2009
Soumoe 5 Bo Q) «B
ID
Last Name, First Name
o The point value of each question is indicated. The quiz is marked out of 20.
o No books or notes permitted.
FORMULAS:
P(A or B) = P(A) + P(B) PM and
Statistics 2500-001 Midterm Oct. 22, 2009
SGLAYUOHS
Last Name, First Name
%Oowt
KID
YOUR TEST MUST BE SUBMITTED BY 4:45PM
0 No books or notes permitted. A calculator is permitted.
0 A formula sheet and normal distribution table are provided. Please do n