HW#1
1.1.1 (b) Janet: Come on in Olaf. Let me see the data that you have computed about the first
frost.
Olaf: Here is what I have come up with. I put the past 99 years of data into a tally plot.
You can see the frequency of the number days after Septembe
2.3.1 (a)
2.3.1. (b) This data does not seem stationary enough to be summarized as a tally table. I do not
think there is anything that would be gained from a tally table, as there is autocorrelation in this
data, in that each high temperature in Central
Baruch College
Draft: 2-18-15
Prof. L. Tatum
STA 9708
Lecture Notes 3. Measures of Association
In previous sections, we have shown how graphical methods and summary
statistics can be used to help us characterize the underlying probability distribution. We
3.1.1 (a) The sample average for this data is a 1.18% monthly percentage return. I computed this
by taking the total sum of the monthly returns and dividing it by the number of monthly returns
(215) in this data.
3.1.1 (b) The 1.18% return (sample average
4.1.1 a)
4.1.1 b) The overall variability in the return on VWEESX between 1988 and 2005 was far less
than the variability in the return on IBM. I can see this by narrowness of the vertical points in the
above scatter plot. Additionally, VWESX was less var
CHAPTER ONE
Introduction to Statistics
D
1.
E
Term
B
E
Term
The complete collection of all entities under study is called the _.
A.
B.
C.
D.
2.
sample
parameter
statistic
population
A portion (subset) of the entities under study is called the _.
A.
B.
C.
CHAPTER SEVEN
Sampling and Sampling Distributions
B
1.
E
Term
D
E
Term
Saving time and money are reasons to take a _ rather than a
census.
A.
B.
C.
D.
2.
poll
sample
profile
Fishbone
Which of the following is NOT a reason for using a sample, rather than a
CHAPTER THREE
Descriptive Statistics
C
1.
E
Term
C
E
Term
Statistical measures used to yield information about the middle of a group of
numbers are called _.
A. averages
B. measures of variability
C. measures of central tendency
D. Z scores
2.
Which of th
CHAPTER FIVE
Discrete Distributions
C
1.
E
Term
B
E
Term
Variables which take on values only at certain points over a given interval are
called _.
A.
B.
C.
D.
2.
point variables
continuous random variables
discrete random variables
value variables
A varia
CHAPTER NINE
Statistical Inference:
Hypothesis Testing for Single Populations
B
1.
M
Term
C
E
Term
Hypothesis testing is derived from the mathematical notion of _.
A.
B.
C.
D.
2.
direct proof
indirect proof
margin of error
infinity
The first step in testi
CHAPTER SIX
Continuous Distributions
D
1. Which of the following is NOT a continuous distribution?
E
Term
D
E
Term
A.
B.
C.
D.
2.
normal distribution
exponential distribution
uniform distribution
binomial distribution
The uniform distribution is _.
A.
B.
CHAPTER EIGHT
Statistical Inference: Estimation for Single Populations
B
1.
M
Term
A
E
Term
When a statistic calculated from sample data is used to estimate a population
parameter, it is called _.
A.
B.
C.
D.
2.
an interval estimate
a point estimate
a sta
CHAPTER FOUR
Probability
D
1.
M
Term
B
E
Term
Which of the following is not a method of assigning probabilities?
A.
B.
C.
D.
2.
classical probability
relative frequency
subjective probability
elementary inference
A process that produces outcomes is called
Solution to Assignment #3
Q1
1. Yes, n 30. t interval is used, because is unknown.
2. 61 t199,0.025 20/ 200 = (58.211, 63.789).
3. The claim is reasonable because = 59 is included in the confidence interval derived from the sample.
Q2
1. 0.45 Z0.025
p
0.4
Baruch College, STA 9708
Prof. Lawrence Tatum
Lecture Notes 1. Data & Distribution
1-28-15
Contents
Section 1.1 What is Ordinary?
Section 1.2 Information and Noise
Section 1.3 Frequency Tables and Histograms
pages 1-4
pages 5-9
pages 10-15
*
Section 1.1 W
Baruch College, STA 9708, 13-16-15
Prof. L. Tatum
Lecture Notes 6. Confidence Intervals and Prediction Intervals
Section 1. 95% Confidence Intervals for
Recall that we have interpreted the sample average, x , as a point estimator of the
population averag
STA 9708; 4-13-15
Prof. L. Tatum
STA 9708: Lecture Notes 8 Two-Sample Statistical Inference
Section 9.1 The Two-Sample t-test
Suppose we are faced with a comparison of two populations. Let us assume that
both populations follow Normal distributions. Our q
STA 9708 Quiz for self-review
(Question 1) A survey team want to estimate the average commute time of all the New Yorkers.
For this purpose, they randomly select 1000 people living in NYC, and record their average
commute time.
1. In this study, the set o
STA 9708 Assignment #2
A list of z probabilities will be provided in the tests.
(Question 1) A survey is conducted to see which gender is more likely to shop online. Among
the 1000 people selected, 60% of females shop online, 40% of males shop online, and
Baruch College, 3-30-15
Prof. L. Tatum
Lecture Notes 7: One-Sample Statistical Inference & Decision Making
Section 1. t-Test for the Population Mean
The previous section introduced the 95% confidence interval for . When rigor is
needed, as in FDA-supervis
STA 9708 Quiz for self-review
The correct answers are marked in bold.
(Question 1) A survey team want to estimate the average commute time of all the New Yorkers.
For this purpose, they randomly select 1000 people living in NYC, and record their average
c
STA 9708 Assignment #1
(Question 1) Two athletes, Dave and Mike, run for 100 meters five times. The time they spend
(in seconds) are recorded in the following.
Dave: 9.9, 10.0, 10, 10.2, 9.9
Mike: 10.2, 9.7, 9.9, 10, 9.8
1. What is the (sample) mean, medi
Question 1
1 / 1 pts
You get a 25-year loan of $150,000 with an 8% annual
interest rate. What are the annual payments?
(Enter your answer as a whole (rounded if needed) number
without the dollar sign or comma. Remember Canvas will
add zeroes.)
Question 2
STA 9708 Assignment #3
A list of z and t probabilities will be provided in the tests.
(Question 1) 200 people in NYC are randomly selected to answer how long it takes them to
commute daily from home to workplace. Suppose the sample mean is 61 minutes and
Question 1
1 / 1 pts
The expected return on an investment is:
equal to the required return
less than the required return
equivalent to the actual return
the mean of the distribution of possible returns
Question 2
1 / 1 pts
In terms of risk, labor union di
Question 1
1 / 1 pts
Which of the following methods would NOT result in a
reduction of business risk?
reduce sales volatility
increase fixed operating costs
reduce operating leverage
diversify
Question 2
1 / 1 pts
Which of the following statements is (are
1. For each pair of variables, indicate what
association you expect:
Positive (+),
Negative (-)
or
none (N).
Write a brief sentence explaining your reasoning.
_ (a) the number of miles a student lives from
school; the students GPA
_
_
_
_
(b) a persons bl
1. Out of the 1000 students enrolled at the West Eden School, 25
weigh below 60 kg and 25 weigh above 88 kg. Assuming this data
is normally distributed, what are the mean and standard deviation?
(You might find it helpful to sketch and label the associate
STA 9708 Final Exam Addendum G. Dixon
STA 9708
Gesille Dixon
5/28/2016
Final Exam Addendum
As an HR manager you were approached by a union representative who claims gender bias in
pay for workers in the clerical department of a large corporation.
You supe
Lecture 11: Sampling Distributiens and the Central
Limit Theerem
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- How t
SAMPLING DISTRIBUTION OF xx
In this section we explore the sample mean, xx, as the statistic. The sample mean is one of the more
common statistics used in the inferential process. To compute and assign the probability of occurrence of
a particular value o
Correcting for Continuity
Translation of Discrete Distribution to Continuous Distribution isnt completely straightforward.
correction of +.50 or (.50) or .50, depending on problem, is Reqd. This correction ensures most of
binomial problems Info is correct
Chapter 7:
Inferences Based on a Single
Sample: Tests of Hypotheses
Sections: 7.1, 7.2, 7.3, 7.4, 7.5, 7.6
STA 9708 Ch 7: One Sample Tests - Prof. Yu Yue, Zicklin School of Business
What are Hypotheses?
Null hypothesis H0 is the claim about a population