Midterm Bonus Question Solution
Question: Suppose there are 10 rats and 30 pellets. Suppose further that the pellets
are distributed to the rats equiprobably. Find the probability that every rat recei
Statistics 401D/XE Statistical Methods for Research Workers Second Exam
Spring, 2008 Prof. Shelley
Answer all parts of each of the following problems. Show all of your work, to obtain maximum partia
Stat 401 F/XW
HW 8 sketch answers:
1) Meat pH over 24 hours (2 pt each part)
a) There seems to be lack of fit.
Residuals plot show a clear bend indicating lack of fit.
resid
0.4
0.3
0.2
0.1
0.0
0.1

Stat 401B Exam 2
November 4, 2008
Name: _
INSTRUCTIONS: Read the questions carefully and completely. Answer each question
and show work in the space provided. Partial credit will not be given if work
04:37 Friday, October 19, 2012 1
Stat 401 F / XW Homework 7 answers
1) Wine and mortality (1 pt each part)
a)
No, a linear regression model is not appropriate. The relationship looks curved.
b) The ot
Stat 401G
Lab 3
Solution
A study was done to see if the body mass of carnivores was related to the bite force the
animal produces. Twentyfive species of carnivore were randomly selected and the body
Stat 401G
Lab 1
Solution
Use JMP to analyze the data in problem 1 below. It is not sufficient to simply hand in
JMP output. You must answer the questions completely. Hand in the JMP output attached
at
STAT 401 Midterm I Practice Problems
1.
In which of the following situations can causal inference to the population(s) be drawn?
(a)
(b)
(c)
Random samples are selected from existing distinct populati
1
Statistics 401 Spring 2013
Exam 2  Sample Questions
1. (5 pt) In class we pointed out that in a test of a reduced model (with fewer
parameters) against a full model (with more parameters) we give a
Statistics 401D/XE Statistical Methods for Research Workers Second Exam
Spring, 2008 Prof. Shelley
Answer all parts of each of the following problems. Show all of your work, to obtain maximum partia
Stat 401G: Quiz 2 Homework Solutions For Wednesday September 14, 2011 Note: On a quiz and test, I will give you the sample mean and standard deviation. For this homework, let JMP calculate these stati
HOW MANY DECIMAL PLACES TO REPORT IN RESULTS OF EXPERIMENTS ?
(From : Sokal and Rohlf, 1987)
 Divide the standard error by 3
 In the quotient, note the decimal place of the FIRST NONZERO DIGIT to th
Stat 401 Outline
Steve Vardeman
Iowa State University
June 30, 2017
Abstract
This is an outline for (one version of) Stat 401 at Iowa State University. This basic course
in the analysis of research da
S TAT 401 F & XW
S TATISTICAL M ETHODS FOR R ESEARCH W ORKERS
FALL 2013
Instructor: Dr. Petrutza Caragea
email address: [email protected]
Office: 2409 Snedecor Hall
Phone: 2945582
Course Website:
Stat 401, Sample Final Exam Problems adapted from Dec. 1995
INSTRUCTIONS FOR THE FINAL EXAM
The examination consists of 10 shortanswer questions. Choose any 10
questions to answer from the 12 questio
Solutions to HW7, Stat 401 Spring 2011
(1). Ch. 10 #18. Here we have I = 5 groups, consisting of J = 4
observations each, with respective group means and sample variances
i=1
cfw_Xi 5 = (12.75, 17.75
#Course: STAT 401D, Fall 2016
#Lab Assignment 2 Key: Visualizing Data
#Author: Professor Olga Chyzh
#Required data file: hmnrghts.txt
#Open dataset:
mydata<read.table("hmnrghts.txt",header=TRUE, na="
Solution: Homework 9
(8.2.5)
(a) 1.00 (3.355)(0.24), which equals to (0.19, 1.81) or 0,19 < D < 1,81 lb.
(b) We are 99 % condent that mean weight loss on mCPP is between 0.19 and 1.81 lb greater
than
Solutions to HW3, Stat 401 Spring 2011
Note: since #38(b) on p.277 is a tolerance interval, a topic I said we
skipped, the 5 points for that problem are extracredit. So the denominator
for this HW is
Solutions to HW4, Stat 401 Spring 2011
(1). #10, pp. 2934. (a). H0 : = 1300, HA : > 1300. (b).
Under H0 , X N (1300, 602 /20), and type I error probability =
1 (1331.26 1300)/(60/ 20) = .010. (c). Wh
Ashley Hedrick
HW1
Due 1 Sep 20117
9am
1.
A) Yes, this would be considered an observational study because the researches are not
imposing any experimental treatments on either of the groups. Instead t
#Homework 5 key: Merging datasets and twosample ttests
#1. Download and open the datasets:
polity<read.csv("p4v2015.csv", header=TRUE)
cinc<read.csv("NMC_v4_0.csv", header=TRUE)
#Clean up the data
#Author: Professor Chyzh
#Goal: Key HW 7: Simple Regression
#Date: October 17, 2016
library(scales)
#Open the dataset, drop missing values, keep only 2010:
mydata<read.csv("oda_growth.csv", header=T)
Ashley Hedrick
HW 2
Due: 8 Sep 2017
1. A) The treatments in this study are control and mutagen. Yes, the conclusions made from this
study can be statistically justified as causal because a random samp