Q4A2 take it from Sunday Feb 3rd at 6:00 PM to Tuesday Feb 5th at 7:00 AM Review of Attempt 1
Started on: Monday, 4 February 2008, 09:24 PM Completed on: Monday, 4 February 2008, 10:24 PM Time taken: 59 mins 54 secs Raw score: 7.05/10 (71%) Grade: 7.
1 Marks: 1 For the following histogram, do you expect the difference between Q1 and Q2 to be
Choose one answer. a. Larger than the difference between Q2 and Q3. b. Smaller than the difference between Q2 and Q3. c. Equal to the difference between Q2
Q5A2- take this quiz from Sunday 17th at 6:00 PM to Tuesday 19th at 11:00 AM Review of Attempt 1
Started on: Monday, 18 February 2008, 10:10 PM Completed on: Monday, 18 February 2008, 11:10 PM Time taken: 1 hour Raw score: 8/10 (80%) Grade: 8 out of
1 Statistics 112 Statistical Reasoning for Social Sciences Spring 2008 Professor Esfandiari Instructor Name: Instructor email: Office hours: Days Room for lecture Mahtash Esfandiari [email protected] MW 2-3 or by appointment MWF: 12:00 1:00 Franz 12
Question 3: Given the following information, what is the best answer: 25th percentile = 10 50th percentile = 20 75th percentile = 60 a) The plot is positively skewed and the best measure of scatter is 40 b) The plot is positively skewed and the best
HW 5 Solutions (Partial)
Problem A:
a) p-hat for Stats112 is 38/72 = .5278 (about 53% of the sample walked)
p-hat for Stats 10 is 290/357= 0.8123 (about 81% of the sample walked).
If we assume that these are each random samples from their populations (the
HW 2 Solutions part 2
October 23, 2007
Some solutions are in the back of your book.
1
Problem 36
The Stata command summarize tv tells us that the average hours watched were 6.657 and the
standard deviation was 10.140. If we assume that the class is a rand
HW 3 Partial Solutions
October 22, 2007
1
Chpt 6, no. 12
1. z = 1.7307:
.53 .5
Z=
.5 .5/832
. Note that we use the p = 0.5 to nd the standard error because we must assume the null
hypothesis is true, and the null hypothesis tells us that p = 0.50.
Because
Stats. 112: Solutions to Homework 4: Ch. 7 (17, 24, 30)
17. a.
1 = 465/1305 = .356
2 = 555/1566 = .354
So the confidence interval is
.356(.644) .354(.646)
(.356-.354) 1.96
+
= .002 1.96(.018) = .002 .035 ,
1305
1566
Or (-0.033, 0.037). There may be no d
Frederick K.H. Phoa
Statistics 112 PS Solution #9 (Fall 2007)
Problem Set 9 Solution Multiple Regression (Part I)
Part (a):
The correlation coefficient is 0.0804, which means it is weak and positive.
Part (b):
No, because correlation is not causation. Hig
Examples of Midterm-like Questions
1. In a study to test the effectiveness of various diets. 40 subjects were randomly assigned
to the WeightWatchers diet (low calories) and 40 to the Atkins diet (low carbs). Weight
was measured at the start of the study
Statistics 112 Professor Esfandiari Review Midterm Spring 2008 You can have a cheat sheet written on both sides and any kind of calculator. You need to have your ID with you to take the midterm. The midterm will be a combination of multiple-choice an
1 Statistics 112 Midterm Examination 1 Professor Esfandiari Spring 2008 There are 6 multiple-choice questions and four open-ended questions. In the case of multiple-choice questions, choose one answer only. In the case of open-ended questions be spec
Statistics 112 Professor Esfandiari Answers to bonus quiz 1) The margin of error is 5 % and we are 95% confident that between 35% to 45% of the population endorse spending more money on the education of at risk students. 2) We reject the null hypothe
Started on: Thursday, 10 January 2008, 08:59 AM Completed on: Thursday, 10 January 2008, 09:10 AM Time taken: 11 mins 13 secs Raw score: 2/10 (20%) Grade: 2 out of a maximum of 10
Continue
1 Marks: 1 John is the research assistant for a sociology pr
Started on: Monday, 25 February 2008, 09:46 PM Completed on: Monday, 25 February 2008, 10:42 PM Time taken: 56 mins 31 secs Raw score: 10/10 (100%) Grade: 10 out of a maximum of 10
Continue
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1 Marks: 1 The objective of a study is to find out
Review of Attempt 1
Started on: Wednesday, 30 January 2008, 09:37 PM Completed on: Wednesday, 30 January 2008, 10:35 PM Time taken: 57 mins 50 secs Raw score: 7/10 (70%) Grade: 7 out of a maximum of 10
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1 Marks: 1 Suppose that the dis
Started on: Monday, 21 January 2008, 11:45 PM
Completed on: Tuesday, 22 January 2008, 12:44 AM
Time taken: 58 mins 36 secs
Raw score: 5.5/10 (55%)
Grade: 5.5 out of a maximum of 10
(1541)
1
Marks: 1
What does the IQR (inter quartile range) represent?
Choo
Statistics 112 Session One Professor Esfandiari Winter 2007
I The objective of this lecture is to A. Make you familiar with the following terms: Data: The information gathered from data and experiments 1. Statistics: The art and science of learning f
1 Statistics 112 Statistical Reasoning for Social Sciences Winter 2008 Professor Esfandiari Instructor Name: Instructor email: Office hours: Days Room for lecture Mahtash Esfandiari [email protected] Tuesday 11-12 and by appointment MW: 12:00 1:30 3
Practice Exam 1 PIC 10A Disclaimer: Your real exam will be similar to this practice exam in spirit, but of course the questions will not be exactly the same. We've covered many topics in the last few weeks, so all topics are not represented on this p
*John is the research assistant for a sociology professor at UCLA. The professor is conducting a study to compare the attitudes of male and female seniors in sociology, psychology, and computer science toward their satisfaction with the courses that
Examples of Midterm-like Questions
1. In a study to test the effectiveness of various diets. 40 subjects were randomly assigned
to the WeightWatchers diet (low calories) and 40 to the Atkins diet (low carbs). Weight
was measured at the start of the study