STAT3000
Chapter 7: Inference for Distributions
Substitute standard deviation to s
Here we no longer assume that
population standard deviations are
known. The t procedures for inference
about means are among the most
common statistical methods.
STAT3000
S
STAT3000
Chapter 4: Probability and Sampling Distributions
Note: Probability allows us to make the inferential jump
from sample to population. The purpose of this
chapter is to see what the laws of probability tell us
without going into the mathematics of
1. Which of the following correlation coefficients represents the strongest relationship?
a.
b.
c.
d.
e.
1.07
0.78
-0.86
0.14
-0.08
QUESTIONS 2-4: The PJH&D Company is in the process of deciding whether to purchase a
maintenance contract for its new word-
STAT 3000
Test 3 (100 points)
Summer
2010
NAME
1. A researcher wishes to determine whether the rate of water flow (in liters per second) over
an experimental soil bed can be used to predict the amount of soil washed away (in kilograms).
The researcher mea
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1. Identify the type of variable as categorical or quantitative in all 4 situations
below.
Favorite soft drink of college students; Speed of a moving car at specified
moments in time; The model of cars in the student parking lots; The height of
your class
STAT3000
Section 10.2 10.3: Inference about Prediction & Some Details of Regression Inference
Recall finding a predicted value:
Ex) In a study to determine how the skill level in
doing a complex job is influenced by the amount
of training, 15 new recruits
STAT3000
Section 10.1: Inference about the Regression Model
Regression Analysis (4 steps)
1. Determine appropriateness of linear model.
a. Random sample
b. Linear shape
c. No pattern in residual plot
d. Equal variance in residual plot
2.
Use the sample da
Chapter 2: Examining Relationships
How can we determine if 2
quantitative variables are
related to each other? If
there is a linear association,
how can that information
help understand and
describe the data?
Suppose we want to predict the assessed value
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Section 6.3: Using Significance Tests
Significance tests are widely used in
reporting the results of research in many
fields of applied science and in industry.
In all these uses, statistical significance
is valued because it points to an effe
STAT3000
Section 6.2: Tests of Significance
General Hypothesis Test
1) check assumptions
2) state the null and alternative
hypotheses
3) compute the test statistic
4) determine the P-value
5) draw conclusion
1) This process relies on the reasonable
condit
QUESTIONS 1-4: To gauge how your firms advertising and other promotional
activities affect your firms sales, you collected data on your firms sales (in thousands of
dollars) for 51 months and the firms promotional expenditures (in thousands of dollars.
Gr
STAT3000
Chapter 11: Multiple Regression
This chapter extends the basic concept of chapters 2
& 10 by modeling the mean value of y as a function
of two or more independent variables.
General Form of a Multiple Regression Model
y = 0 + 1x1 + 2x2 + + pxp +