8.16
There is a correlation as the difference of the sample mean of .515 and T-statistic of .57 lies in
between the 95% confidence interval of (-1.308, 2.338)
11.15
a. MATH2011 = -97.413872 + 1.1881835 MATH2001
b. y = -97.414 + 1.188x
c. Since the math test gets harder over the years, it is practical to say if a person scores 0 on
a Math test in 2001 that same person is going to score -97 on a Math test in 2011
Anthony Brusco
Excel Problems
2.24 a.
b. About 72%. I used the Stem and Leaf Plot since it shows all the numbers and not just a range
c. I used the Stem and Leaf Plot since again the Stem and Leaf Plot since the Histogram you can
only approximate what bar
Anthony Brusco
Professor Carides
Stastics 2101
25 January 2016
The following statistical statement I have found is based on the topic of Daily Fantasy
Sports changing the definition of what gambling is. The main issue of the topic is that
politicians are
6.12.
a. (66.350, 69.160)
b. My result does agree with the handout as the handout is only a little different with it
rounding the numbers to 3 decimal places
c. There is 90% confidence that the sample mean lies between the interval (66.350,
69.160)
d. I d
Welcome Students!
MyMathLab is an interactive website where you can:
Self-test & work through practice exercises with step-by-step help to improve your math skills.
Study more efficiently with a personalized study plan and exercises that match your book
Probability Formula Sheet
Probability Formulas
Conditional Probability
P( A | B)
P ( A _ and _ B )
P(B)
Independent Events
P ( A | B ) P ( A)
Complement Rule
P ( A ) 1 P ( A)
Multiplication Rule for Independent Events
P ( A _ and _ B ) P ( A | B ) P ( B
Stat 2103
Prof Hopson
Exam 2 Please show ALL work for credit.
, x z*
x z *
,
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n
Z*
p
(1 p
) Z
p
,
n
NO WORK = NO CREDIT
(x x )
t 1 2
X
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Z
, x z*
,
s12 s 22 ,
, x z
n
n
n
n1 n2
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Moving Beyond Linearity
The truth is never linear!
1 / 23
Moving Beyond Linearity
The truth is never linear!
Or almost never!
1 / 23
Moving Beyond Linearity
The truth is never linear!
Or almost never!
But often the linearity assumption is good enough.
1 /
BIOSTATISTICS PUBLIC HEALTH 5002
Fall 2016
Quiz 5
Instructions: Each question is worth 2 point. There is no penalty for guessing, therefore do not
leave blanks on the EXCEL answer sheet. A blank will get a zero, but the correct answer (could
also be the b
Final Exam Solutions
1. (8) Write the best answer below the question for the following multiple choice
questions. No explanation necessary.
(1) Ten tidal pools of the same size were found in a certain coastal region. It was
randomly determined which 5 wou
BIOSTATISTICS PUBLIC HEALTH 5002
Fall 2016
Quiz 4
Instructions: Each question is worth 2 point. There is no penalty for guessing, therefore do not
leave blanks on the EXCEL answer sheet. A blank will get a zero, but the correct answer (could
also be the b
BIOSTATISTICS PUBLIC HEALTH 5002
Fall 2016
Quiz 1
Instructions: Each question is worth 2 point. There is no penalty for guessing, therefore do
not leave blanks on the EXCEL answer sheet. A blank will get a zero, but the correct answer
(could also be the b
BIOSTATISTICS PUBLIC HEALTH 5002
Fall 2016
Quiz 3
Instructions: Each question is worth 2 point. There is no penalty for guessing, therefore do not
leave blanks on the EXCEL answer sheet. A blank will get a zero, but the correct answer (could
also be the b
BIOSTATISTICS PUBLIC HEALTH 5002
Fall 2016
Quiz 2
Instructions: Each question is worth 2 point. There is no penalty for guessing, therefore do
not leave blanks on the EXCEL answer sheet. A blank will get a zero, but the correct answer
(could also be the b
7.5 Test of Hypothesis about a Population Mean :
Students t-Statistic
This section deals with the case when the sample size is small and is not known.
We will be assuming that the population is normal.
P-value:
Ha
Ha: > 0
p-Value (= area of shaded region)
Sample Exam #1
Elementary Statistics
Instructions. No books, notes, or calculators are allowed.
1. Some variables that were recorded while studying diets of sharks are given below.
Which of the variables are categorical?
A. The amount of food eaten in a d
STAT 350 Practice Final Exam Solution (Spring 2015)
PART 1: Multiple Choice Questions:
1) A study was conducted to compare five different training programs for improving
endurance. Forty subjects were randomly divided into five groups of eight subjects in
AP Statistics
Chapter 11-12 Review
1. In formulating hypotheses for a statistical test of
significance, the null hypothesis is often
A. a statement of no effect or no difference.
B. the probability of observing the data you
actually obtained.
C. a stateme
Stat 2512, Fall 2016
Intermediate Statistics
Basic Information:
Instructor: Yuexiao Dong
Oce: Speakman Hall 348
Telephone: (215) 204-0670
E-mail: [email protected] (Please put Stat2512 into the subject of
the email.)
Class: Tuesday and Thursday 2:00 pm-3:2
Stat 2512, Midterm Sample Exam 2
1. (5 points) Suppose Y1 Gamma(1 , ) and Y2 Gamma(2 , ), 1 >
0, 2 > 0, > 0. Furthermore, Y1 and Y2 are independent. Find the pdf of
Z = Y1 + Y2 .
Solution: Because Y1 and Y2 are independent, we have
MZ (t) = E(eZt ) = E(e(
Stat 2512, Midterm Sample Exam 3
1. (5 points) The moment generating function of X is
1
MX (t) = (2 + et + e2t );
4
the moment generating function of Y is
1
MY (t) = (et + e2t + e3t );
3
X and Y are independent random variables. Let W = X Y . Find the
mom
Stat 2512, Midterm Sample Exam 1
1. (5 points) Z is standard normal, or Z N (0, 1). Find the pdf of U = Z 2 .
Solution: Use method of cdf, for u 0, FU (u) = 0 and consequently fU (u) =
0. For u > 0, we have
FU (u) = P (U u) = P (Z 2 u) = P ( u Z u) = FZ (
Exercise 1.6 Extra Credit
What kind of sample is used in each case: Simple random, systematic, cluster, stratified,
convenience, or expert?
1. In order to test a new chocolate bar, Hershey asked employees to have their children try
it. Simple Random
2. Co