Practice problems
2.Compute E(X),E(Y),E(XY).
3.Are X and Y independent?
Q2.
Q3.
Q4.
Practice problems
Q5.
Q6.
Q7.
Practice problems
Q8.
Q9.
Q10. Wages for workers in a particular industry average $11.90 per hour and the
standard
deviation is $0.40. If the
Formula Sheet for Statistics 100B
x
ij
2
2
Total SS = x ij x = x ij n
2
2
xij
2
Ti
Ti2 G2
2
SST= ni xi x = = ,
ni
n
ni
n
SSE = n1 1 s12 + n 2 1 s22 + . + n k 1 sk2
d f T rt = k 1 an d d f E = n k
x x t
i
j
1 1
s +
ni n j
/2
dfTrt = k1
d
STAT 100B
Chapter 13: Multiple Regression Analysis
181
182
183
184
185
186
187
188
Example:
189
190
191
equations.
Solving the normal equations can be quite complex;
therefore, we will rely on Minitab to do this for us.
192
193
Example: The relationship b
209
210
211
212
213
214
215
216
217
218
219
Multicollinearity can cause a large difference between
R 2 and R a2 .
_
220
221
222
223
224
225
Interpreting is in Multiple Regression
i is the change in the expected value of Y for a one unit
increase in Xi, w
COURSE SYLLABUS
Statistics 100B, Spring 2016
Introduction to Statistics
Course Description
This is a 5 unit course composed of 3 lecture units per week, 1 lab unit per week = 3 hours of
lab, and 1 discussion unit per week. The prerequisite for this course
STAT 100B
Section 8.6 & 9.4: Estimating & Testing the Difference between Two Population Means
A problem equally as important as estimating or
testing a single population mean for a quantitative
population is the comparison of two population
means.
Propert
STAT 100B
Section 8.7 & 9.6: Estimating & Testing the Difference between Two Binomial
Proportions
Properties of the Sampling Distribution of ( P1  P2 ) ,
the Difference between Two Sample Means
1. The mean of ( P1  P2 ) is
2. The standard error of ( P1
STAT 100B
Section 10.4: SmallSample Inferences for the Difference between Two Population
Means: Independent Random Samples
When the sample sizes are small, you can no longer
rely on the Central Limit Theorem to ensure that the
sample means will be normal
STAT 48
Practice Problems
Cacho
1. If the sample mean is much larger than the sample median, the data is said to be
a. symmetric
b. skewed to the right
c. skewed to the left
d. uniform
Use the following box plot to answer Questions 24. Assume all of the
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