E370, Fall, 2015
Class Activities Week of 9/14/2015 ANSWERS
pg. 1
Name_SID_Lab Section #_ Please read and
follow the instructions in order to get the most credit.
1.
A data set contains several variables of information about a sample of Facebook users. Sk
E370, Fall, 2015
pg. 1
Class Activities Week of 9/28/2015 ANSWERS
Name_SID_Lab Section #_
1.
Determine if any of the following scenarios are legitimate binomial situations. If not, why not?
A. Car security alarms go off at a mean rate of 3.8 per hour in a
E370, Fall, 2015
Class Activities Week of 8/24/2015 ANSWERS
pg 1
Name_SID_Lab Section #_
1.
Indicate the type of statistical activity described, either Descriptive (D) or Inferential (I).
A.
Examine the weights of a sample of 75 manufacturer parts to see
Exam Three Information
Date, Time,
Location
Monday, March 25, 2013
8:00 to 9:30 PM
DSS Students begin exam at 7:30 PM.
The exam will begin promptly at 8:00 PM. If you are late, you will not
receive additional time to take the exam, regardless of the circu
1. John is a brand manager for Coors Light. John decided to drop the price for Coors Light from $12/case in January
2009 to $10/case in February 2009. He examined the data in early March and found February demand = 120,000.
January demand = 100,000 cases.
Summer I 2011 E370 Section 5314
Answer Key to Homework Assignment #3
1.
a.
b.
c.
d.
e.
f.
g.
h.
X-bar~? (2%, SQRT(.33/10)=.1817)
Y-bar~N(680, SQRT(6400/10)=25.2982)
Because sample size > 30,
X-bar~approximately N(2%, SQRT(.33/50)=.0812)
Y-bar~N(680, SQRT(
E370, Fall, 2015
pg. 1
Class Activities Week of 10/12/2015 ANSWERS
Name_SID_Lab Section #_
1.
List 3 reasons why samples and their statistics are often used in statistical practice rather than populations and their parameters.
Timeliness of answers, reduc
E370, Fall, 2015
pg. 1
Class Activities Week of 8/31/2015 ANSWERS
Name_SID_Lab Section #_
1.
The table to the right contains observations for the length in years all British monarchs reigned. An Excel file containing
these observations is posted in Oncour
Assessment: Lesson 1 Drilling Past Questions
Question 1:
Type:
Correct
answer(s):
Which of the following is an example of statistical inference?
A subset of statistics composed of methods that use descriptive
statistics to make educated guesses (infer) ab
Assessment: Lesson 4 Drilling Past Questions
Question
1:
Type:
Correct
answer(s
):
It can accurately be said of the mean that
Multiple Choice
the mean is always the 50th percentile.
depending on data, more than one mean can exist.
the mean balances positi
Assessment: Lesson 18 Drilling Past Questions
Question 1:
The 2009 National Survey of Student Engagement (NSSE) reports that 73% of first-generation
college students plan to pursue graduate school, whereas 87% of non first-generation college
students plan
E370 Homework Assignment (IV&V)_Spring 2013
Due date: April/17/2013 (Wed)
Instructor: Shu-Ling Wang
Requirement Please hand in your GROUP work at the beginning of the class. You need to
write down all the members name on this HW. However, if somebody in y
3. The grades of all the E370 students are normally distributed with mean 70 and an
unknown standard deviation. Suppose we randomly draw 25 students from this
population and compute the mean grade of this sample in order to do the inference about
the popu
E370 Homework Assignment (II)_Spring 2013
Due date: Feb/13/2013
Instructor: Shu-Ling Wang
1. IQR (12 pts in total; 4 pts each for Q1 and Q3, 4 pts for the range.)
The following stem and leaf diagram represents the scores on a calculus exam for a
sample of
Name_TeamNumber_E370Exam4(Lab)pg1
1. The life times of light bulbs that are advertised to last for 5000 hours are normally distributed with
a mean of 5100 hours and a standard deviation of 200 hours.
(a) What is the probability that a randomly selected bu
E370 Homework Assignment (I)_Spring 2013
Due date: Jan/28/2013
Instructor: Shu-Ling Wang
Requirement There are FIVE questions in this assignment. You need to hand in your
INDIVIDUAL paper work at the beginning of the class on 1/28. Also, do NOT just give
E370 Homework Assignment (III)_Spring 2013
Due date: Mar/06/2013
Instructor: Shu-Ling Wang
Requirement There are 20 questions in this assignment. Please hand in your
INDIVIDUAL paper work at the beginning of the class on Mar/06. Each of the questions is
w
Sample Exam F pg. 1
Men's heights are normally distributed with a mean of 69 inches and a standard deviation of 3
inches. Women's heights are normally distributed with a mean of 63 inches and a standard
deviation of 2 inches. Use this information to answe
This data set lists raw score on an economics department microeconomics final exam based on a sample of 99 students.
SAT verbal and Math are also listed. Using this data set, answer the following questions.
Note: We will work on No.1 to No.5 in the class,
Research question:
Does gender (male or female) have any effect on the amount of earnings one makes?
Motivation:
To be able to conclude what each gender (male or female) needs more before entering the
work force, education or experience, in order to maxim
Brief Summary & Outline:
In the remainder of this research paper, we evaluate the relationships between earnings,
education and experience for both males and females, in order to determine the optimal levels of
education and experience needed for each gen
M300 Quiz 4 (Section 15859)
NAME (print)
Your Instructors
Name_
Username
Directions: Circle the letter associated with your answer. Use your USERNAME on
scantron.
Q1. Suppose that a retailer buys a product from a manufacturer for $90 and wants a 40% marku
Sample Exam E, pg 1
A random sample of 54 Indiana residents revealed 36 who planned to make at least one summer
trip next year. For those Indiana residents who plan to travel at least once in the summer,
planned spending on travel is normally distributed
E370
10/25/2014
Inferential Methods:
Confidence Interval
Estimation
Week 10 Pt 3
An
important use of confidence
intervals is calculating the
minimum n for a particular level of
confidence. We use the margin of
error, e, to estimate n.
Solve
for n:
Minimum
A survey about living expense of IU students was conducted to estimate college education cost.
Expenditures vary across students. In 2012, the average monthly living expense was $945 and the (population) standard deviation was $180.
Assume the expense is
1. Two types of statistics:
a. Descriptive Statistics:
a.i. summarize a fixed data set, using tools to make the information in the set
more easily understood (describing a data set)
a.ii. collecting, organizing, presenting & summarizing data using charts/