STAT 6315
Homework 2 Solutions
1. In each of the following situations, describe the sample as a Simple Random Sample, a
stratified random sample, a cluster sample, a multistage sample, or a voluntary
Chapter 5: Sampling Distributions
5.1: The Sampling Distribution of the Sample Mean
A parameter is a numerical descriptive measure of a population. Because it is
based on the observations in the popul
Binomial Random Variables
Issues from Homework 1: Chapter 4
1. Students described the distribution/skew of categorical variable
2. Students interpreted the mean from the boxplot instead of median
3. S
Sampling Variability
Tasks:
1. Bead Box Sampling
2. Add your Bead Box Sample results to the class dot plot
3. Create the dot plots for the price and weight for each of
the diamond samples
4. Calculate
Distributions of Random Variables
Gaussian Distributions
STAT 6315
Professor Kaplan
27 Jan 2016
Named distributions of Random Variables that we will see this semester.
Categorical
Bernoulli
Quantitati
Gettysburg Address
(Random Sampling)
Professor Jennifer Kaplan
Fall 2016
15 Aug 16
Task: Estimate the mean word length for all of the
words in the Gettysburg address.
Part a: Make a guess
Parts b - f:
STAT 6315
Statistical Methods for Researchers
Professor Jennifer Kaplan
Fall 2016
11 Aug 16
Outline for the Day
Overview of STAT 6315 and the Investigative
Cycle including a Brief Tour of eLC and the
Confidence Intervals
STAT 6315
Professor Kaplan
14 Sep 2016
What is the relationship between the margin of error, the sample size, and the confidence
level of a confidence interval?
How do we interpre
Margins of Error
Most of students did really well in recognizing the difference between observational study
and experimental study. There was only onestudent using parrot response. Most of them
were a
Sampling Distributions
Students did not
1. mention that Saturdays have the highest fatality rates
2. mention context explicitly when describing histograms and/or scatter plots.
3. describe the slope i
Foundational Vocabulary and Ideas
STAT 6315
Professor Kaplan
26 August 2016
What questions do you have?
Variable Type
Observational
Unit
Population
Sample
Parameter
Statistic
Sampling
Variabili
Experimental Design
STAT 6315
Professor Kaplan
19 & 22 Aug 2016
In an EXPERIMENTAL STUDY a researcher manipulates factors (or
explanatory variables) to create treatments, randomly assigns
subjects to
Applications of the Central Limit Theorem
Reading for Sep 12 - 16: Sections 9.1 and 9.2
Read the Project Assignment and Rubric and start looking for a
suitable data set. (NOTE: You MAY use a data set
Chi-square Tests
This week
Monday Lecture on comparing proportions from two populations
Wednesday Lecture on Chi-square tests and lab time
Friday Lab time
STAT 6315
Professor Kaplan
19 Oct 2016
Do the
STAT 6315
Midterm 1
Name:
1. All-in-one sound systems, called mini-systems, typically include an AM/FM tuner, a
dual cassette tape deck, and a CD changer in a book sized box with two separate
speakers
Chapter 11: Multiple Regression
11.1: Multiple Linear Regression Model
Models that include more than one independent variable are called multiple
regression models. The general form of these models i
STAT 6315
Homework 1
1. A fast food restaurant monitors its drive-thru service times electronically to ensure that
its speed of service is meeting the companys goals. A sample of 28 drive -thru times
STAT 6315
Homework 3
1. Marque Electronics is a family-owned electronics repair business in Kansas City. The
owner has read an advertisement from a local competitor that guarantees all high definition
STAT 6315
Homework 2
1. In each of the following situations, describe the sample as a Simple Random Sample, a
stratified random sample, a cluster sample, a multistage sample, or a voluntary
response s
STAT 6315
Homework 1 Solutions
1. A fast food restaurant monitors its drive-thru service times electronically to ensure that
its speed of service is meeting the companys goals. A sample of 28 drive -t
STAT 6315
Homework 3 Solutions
1. Marque Electronics is a family-owned electronics repair business in Kansas City. The
owner has read an advertisement from a local competitor that guarantees all high
STAT 6315
Homework 4
1. A normally distributed population has a mean of 500 and a standard deviation of 60.
a) Determine the probability that a random sample of size 16 selected from this
population w
STAT 6315
Homework 5
1. For each of the following pairs of hypotheses, determine whether each pair represents
valid hypotheses for a hypothesis test. Explain reasons for any pair that is indicated to
STAT 6315
Homework 5 Solutions
1. For each of the following pairs of hypotheses, determine whether each pair represents
valid hypotheses for a hypothesis test. Explain reasons for any pair that is ind
STAT 6315
Homework 4 Solutions
1. A normally distributed population has a mean of 500 and a standard deviation of 60.
a) Determine the probability that a random sample of size 16 selected from this
po
QM353: Business Statistics
Chapter 3
9.2. For the following hypothesis test:
with n = 64, = 9, and x = 196.5, state
a. the decision rule in terms of the critical value of the test statistic
b. the cal
STAT 6315
Homework 6
1. Descent, Inc., produces a variety of climbing and mountaineering equipment. One of its
products is a traditional three-strand climbing rope. An important characteristic of any