Statistics
Problem Set 2: SOLUTIONS
Igor Karagodsky
SOLUTIONS
Problem Set 2
Question 1
Imagine you go for a visit to the Institute of Contemporary Art (ICA) in Boston. 60% of the
pieces of art displayed at the current exhibition are paintings (P), 25% are
Section 2.1: For exercise 5-8, find the class boundaries, midpoints, and widths for each class.
5.
43-47
o
o
o
6.
125-131
7.
Class boundaries: 125 0.5= 124.5 , 131 + 0.5= 131.5
Midpoints: Xn= lower boundaries + upper boundaries /2 = 124.5 + 131.5 / 2= 128
What is the difference between cluster and stratified sampling? Give an example of each and
respond to at least two of your classmates' postings.
The difference between cluster and stratified sampling is a cluster uses all members in the
sections in which
MAT 150WB Special Assignment for Sections 8.4 8.5
1) The listed values are waiting times (in minutes) of customers at the Jefferson Value Bank,
where customers enter a single waiting line that feeds three teller windows. Test the claim
that the standard d
MAT 150 Special Assignment for Sections 7.3 and 7.4
1) An insurance company checks police records on 582 accidents selected at random and
notes that teenagers were at the wheel in 91 of them. Create a 98% confidence interval
for the percentage of all auto
Exercises 3-1
1. Calories in Salads are salads a healthy menu choice? Listed below are the number of calories in
selected entre salads at several popular restaurants. Find the mean, median, mode and
midrange for the data.
1165
1270
590
1180
1005
860
1090
Exercises 6-1:
1.-
What are the characteristics of a normal distribution?
3.-
A normal distribution curve is bell-shaped
The mean, median, and mode are equal and are located at the center of the distribution.
A normal distribution curve is unimodal.
The c
Exercises 3-3
1.-
What is a z score? Is the value obtained by subtracting the mean from the value and dividing the
result by the standard deviation. The Z score represents the number of standard deviation that a
data falls below and above the mean.
9.-
Va
2nd Assignments
Section 2.1: For exercise, 5-8, find the class boundaries, midpoints, and widths for each class.
5.
43-47
o Class boundaries: 43-0.5= 42.95 ; 47+0.5=47.5 ; 42.5 47.5
o Midpoints: Xn= lower boundaries + upper boundaries / 2 = 42.5 + 47.5 /2
MAT 150
Elementary Statistics Special assignment for Sections 8.2 and 8.3
1) When people smoke, the nicotine they absorb is converted to cotinine, which can be
measured through blood tests. A random sample of 40 smokers has a mean cotinine
level of 172.5
Jillian Arena
Beh Stats
Research Proposal
April 22, 2012
Introduction.
Women in the workplace are no longer a rarity. Most women today work for at
least some part of lives even after marriage. This was not the case a mere fifty years ago.
Just because mor
Last name: Arena, First name: Jillian
AlphaOrder number: 8
Brownell
March 14, 2012
Sample
The samples used in this study can be generalized into three types: lefthemisphere damaged patients, rights hemisphere damaged patients and (the control)
healthy bra
Here are some suggestions for preparing for the second midterm.
Study Guide for Midterm 2
Wednesday, March 28, 2112
SPSS printouts
Be able to find the following (some terms are synonyms) on a printout: F ratio and
degrees of freedom for each main effect a
Jillian Arena
Beh Stats
Brownell
March 27, 2012
Assignment 7:
One page maximum. Describe an experimental task or situation that could be used to
demonstrate theory of mind (or something very similar) in either a non human species or
in a young human child
Jillian Arena
Beh. Stats
Assignment 6
March 2, 2012
Assignment 6:
First five subjects in the alcoholic group need to be excluded for a variety of
reasons. The following were eliminated for the data analysis: Two because of equipment
failure, Two because o
Jillian Arena
Beh. Stats
Assignment 6
March 2, 2012
Assignment 6:
One of the main results of the study is that the interference for the Spanish color
words did not show as large of an effect as the inference paired with the English color
words. This is sh
Arena, Jillian
Revised Assignment 6
8
March 20, 2012
Results and Interpretation of Stroop Test
Five subjects, in the alcoholic group, were excluded prior to data analysis because of
either equipment malfunction, incorrect answers in the stimulus categorie
Arena, Jillian
Revised Assignment 6
8
March 20, 2012
Results and Interpretation of Stroop Test
Before the analysis we excluded five subjects because their data was
incompletely reported. The data revealed a significant main effect of condition, F=
20.275
Arena, Jillian
8
Assignment 3
February 7, 2012
Assignment 3
For the Expectancy Effect there are two main factors that may contribute to this
phenomenon: children receiving more attention from the teacher or the teacher
challenging the so-called bloomers.
Analysis of Variance (ANOVA)
Introduction
1. In this chapter, we consider the problem of deciding whether observed differences
among more than two sample means can be attributed to chance, or whether there are
real differences among the means of the popul
Memorandum To: Mayor of Newton From: Nancy Ng Huang, "Doant, Kare, No, How" consultant Subject: On the future use of water by BC students. Because there will be an increase in the future students population on Newton, a sample of fifteen students wer