STAT 2215
Homework 1 Solutions
Chapter 1 Problems 16a-c, 23
23: Using the boxplots you have generated, compare the distribution of the
scores of the intrinsic group vs. the extrinsic group by contrasting their
centers, spreads, symmetry and outliers (if a
STAT 2215Q
Homework #6
16. (a)
This boxplot shows the gross domestic product per capita in 228 countries.
(b) Descriptive Statistics: PerCapitaGDP
Variable
PerCapitaGDP
N
228
N*
0
Mean
16018
SE Mean
1362
StDev
20567
Minimum
300
Q1
2825
Median
9300
Q3
2275
STAT 2215
Homework 2 Solutions
Chapter 2 Problems 12, 13, 14, 22
Problem 12] Marijuana Use During Pregnancy. For the birth weights of babies in
two groups, one born of mothers who used marijuana during pregnancy and the other
born of mothers who did not (
STAT 2215
Homework 4 Solutions
Chapter 5 Problems 24, 25
Problem 24]
How strong is the evidence that the distributions of 2005 annual incomes differ in the
four populations?
o What set of hypotheses will answer the question of whether 2005 annual
incomes
Chapter 2 Minitab Details
Case 2.1.2. Anatomical Abnormalities Associated with Schizophrenia-an Observational
Study.
Step 1: Copy the data into a Minitab Worksheet.
Use these steps
File Open Worksheet Browse your local directory and upload the Excel file
Name:
SOLUTIONS
STAT 2215 Review for Exam 1
1.What does it mean for a statistical procedure to be robust?
A statistical procedure is robust if it is valid even when a particular assumption is not met.
2 . Fill in the blank:
Sometimes experimenters are abl
STAT 2215
Homework 3 Solutions
Chapter 3 Problems 22, 32
Problem 22] Voltage and Insulating Fluid. Researchers examined the time in
minutes before an insulating fluid lost its insulating property. The data below are the
breakdown times for eight samples o
NAME:
STAT 2215
Review for Midterm II
Question 1
Soft-drink manufacturer use five agents (1, 2, 3, 4, and 5) to handle premium distributions for its
various products. The marketing director desired to study the timeliness with which the
premiums are distr
Introduction to Hearing Aids
Treatment of HL: Amplification & ALDs
2
What happens with a Hearing Loss?
Loss of Audibility
Loss of Intelligibility
3
Audibility
4249 Fall 2010
4
Dynamic Range
0
Soft
Medium
Soft
60
Medium
Loud
120
NORMAL
Loud
120
HEARING IMP
STAT 2215
Homework 5 Solutions
Chapter 7 Problems 13, 14, 28, 30
Problem 13] Big Bang Data. Using the results displayed in Display 7.9, find a 95% confidence
interval for the intercept in the regression of measured distance on recession velocity.
We use a
Chapter 4 - Minitab Details
Case 2.1.2. Continued. Anatomical Abnormalities Associated with Schizophrenia An
Observational Study R&S p. 31-32 and p. 100-102
Step 1: Copy the data into a Minitab Worksheet.
Use these steps:
File Open Worksheet Browse your l
Chapter 18 Comparisons of Proportions or Odds
Case 18.1.1. Obesity and Heart Disease An Observational Study. R&S p.550.
Step 1: Input the data directly into a worksheet. Input the data into columns directly. Name Column 1
as CVD_Yes and name Column 2 as C
Chapter 3 - Minitab Details
In Minitab, under each procedure, go to Help, click on see also and Methods and Formulas
for details about the procedure.
Case 3.1.1. Cloud Seeding to Increase Rainfall A Randomized Experiment
Step 1: Copy the data into a Minit
Chapter 10 Inferential Tools for Multiple Regression
Case 10.1.1. Galileos Data on the Motion of Falling Bodies A Controlled Experiment.
R&S p.272-273.
Step 1: Copy the data into a Minitab Worksheet: use these steps:
File Open Worksheet Browse your local
Chapter 7 - Minitab Details
Case 7.1.1. The Big Bang An Observational Study R&S p. 177-179
Step 1: Copy the data into a Minitab Worksheet: use these steps:
File Open Worksheet Browse your local directory and upload the csv file case0701.csv. The data
will
Chapter 5 - Minitab Details
Case 5.1.1. Diet Restriction and Longevity A Randomized Experiment.
R&S p. 114-116
Step 1: Copy the data into a Minitab Worksheet: use these steps:
File Open Worksheet Browse your local directory and upload the csv file case050
Chapter 9/Lecture 1: Linear Correlation
Linear Correlation
o Perfect Correlation what would it look like?
E.g., An exact match on one measure with another
E.g., Final grades that are all exactly 10 points lower than the midterm
E.g., Shoe size and heig
Chapter 9 Multiple Regression
Case 9.1.1. Effects of Light on Meadowfoam Flowering A Randomized Experiment R&S
p.238-239.
Step 1: Copy the data into a Minitab Worksheet: use these steps:
File Open Worksheet Browse your local directory and upload the csv f
Chapter 1 - Minitab Details
Case 1.1.1. Motivation and Creativity - A Randomized Experiment
Step 1: Copy the data into a Minitab Worksheet: use these steps:
File Open Worksheet Browse your local directory and upload the csv file, case0101.csv. The
data wi
Chapter 8 A Closer Look at Assumptions for Simple Linear Regression
Case 8.1.1. Island Area and Number of Species An Observational Study R&S p. 208-209
Step 1: Copy the data into a Minitab Worksheet: use these steps:
File Open Worksheet Browse your local
Midterm Practice Problems
Hints at the end for #6,12,13,16.
1. You are comparing two groups in terms of depression. You run an analysis and find the MS
within groups equals 42.5. Youve also run a ttest to examine wh
Homework 2
Due Wednesday March 6
Use the Data Set called hot hw2.
It contains 16 variables including 8 personality variables. The file is in SPSS and the
variables should all be self-explanatory
1) Compute the correlations among the 16 variables and creat
Lecture 3
Null Logic- The null hypothesis test is:
o Weak the null hypothesis is always wrong
o Cowardly it does not test what we think, only what we do not thing
o Limited does not provide a model for everyday or applied inference
Because we are removin
Chapter 17
Multiple Regression: An extension of linear regression in which there are multiple
predictor variables predicting one criterion variable
Two Uncorrelated Predictor Variables (two variables, each correlated with the criterion
variable, but not w
Chapter 10: Linear Regression
Linear regression
o Regression line = where the line with the springs settles
o Slope of the line tells you when you see changes across one variable (e.g., shoe
size) see change in other variable (e.g., height)
*Can quantify
Chapter 10
Linear Regression
I will begin reviewing regression with another example of linear correlation. Imagine that a career
counselor is interested in how well college grade point averages (GPA's) predict annual salaries five years
after graduation.
Chapter 9
Linear Correlation
In order to review the calculation of Pearson=s r, I will describe a hypothetical study to determine
whether people who come from large immediate families (i.e., have many siblings) tend to create large
immediate families (i.e
Regression Equations
Standardized regression equation with one predictor: zy = r zx
Centered scores: cy = r(Sy/Sx)cx / cx = r(Sx/Sy)cy
Raw Scores: y = r(Sy/Sx)x + My - bMx
How much variance is not accounted for? :
Correlation of non-determination = 1 r2
C
STAT 2215 Homework 1
(Due Sunday, 1/29/2017)
1. Problem 2.
Reproduce the computation outputs of Case 1.1.2 Sex Discrimination in Employment
on Page 24 Page 28 of the Ch1 slide.
eg. boxplot, histogram, probability plot, variance test, two-sample t test
2.
STAT 2215
Homework 2
(Due Sunday, 2/5/2017)
Chapter 2 Problems 12, 13, 14, 15
Chapter 2
Problem 12] Marijuana Use During Pregnancy. For the birth weights of babies in two
groups, one born of mothers who used marijuana during pregnancy and the other born o