AET281
Fall 2012
Quiz #3
Name:.
1. A pharmaceutical company has determined that if a new cholesterol-reducing drug is
manufactured (introduced to the market), the following probability distribution will
describe this drug's contribution to the company's p

Practice test question on Sec.
2.4
For a dataset involving two variables x and y, we learn that the
correlation r equals 0.64. Which of the following is true about the
slope of the regression line?
A It must be positive, but we cant say what it is.
B It m

Practice for 3.2
A)
B)
C)
D)
In a recent study, a random sample of children in
grades 2 through 4 showed a significant
negative relationship between the amount of
homework assigned and student attitudes.
What type of study is this?
An experiment.
An obser

Practice test question on Sec.
2.1
A study measured the effects of several types of drug
on patients blood pressure. The variable blood
pressure is a
A
B
C
D
Categorical explanatory variable
Categorical response variable
Quantitative explanatory variable

Practice test question on Sec.
2.1
A study measured the effects of several types of drug
on patients blood pressure. The variable blood
pressure is a
A
B
C
D
Categorical explanatory variable
Categorical response variable
Quantitative explanatory variable

STOR 155.005
Fall 2014
Chapter 2
Section 2.1 & 2.2
Chapter 2: Looking at data relationships
2.1: Relationships between two variables
2.2 2.4 Associations between quantitative
variables
2.2 Scatterplots
2.3 Correlation
2.4 Least-squares regression
2.5 : Ca

Practice test question for Sec.
1.3
A certain dataset is strongly right skewed. Only one of
the following statements must necessarily be true;
which is it?
A The median is larger than the mean.
B The mean is larger than the median.
C The standard deviatio

STOR 155.008
Spring 2015
Section 1.4
WebAssign Homework 3
Section 1.4: Density curves and
normal distributions
Density curves
Normal distributions
Histograms
Mean
Median
68-95-99.7 rule
Standardizations
Calculations
Standard normal table
Normal quantile p

Binomial Probability Distribution
Enter data only in green-shaded cells.
Number of successes, x
Sample size, n (up to 50)
Probability of a success, p
f(x) = P(X = x)
x
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
3

Practice test question on
Sec. 2.3
Shown is the
calculation of
the correlation
of x and y, with
some numbers
missing.
_
i
xi
yi
(xi x)/sx
(yi y)/sy
product
1
0
5
1.1
+1.17
1.28
2
2
2
T
0.83
+0.25
3
3
2
+0.1
0.83
0.08
4
_ 6
_ 4
+1.3
+0.65
+0.65
x = 2.75 y

STOR155.005
Fall 2014
Section 6.1
Chapter 6: Introduction to Inference
Basic question in statistical inference:
Given the information in a sample, what
_
can we say about the population?
Specific question addressed in this chapter
for illustration: Given

STOR 155.005
Fall 2014
Chapter 3 Section 3.1 & 3.2
Chapter 3 Producing data
3.1 : sources of data
3.2: Design of experiments
3.3: Design of sample surveys
3.4: Toward statistical inference
Chapter 3 Sec 3.1: Sources of data
Anecdotal data
Available data
O

Measure of Variation Notes
When rounding the value of a measure of variation, carry one more decimal place than is
present in the original set of data.
The standard deviation of a set of sample values, denoted by s, is a measure of variation
of values abo

Chapter 3 Notes
Measure of Center
the value at the center or middle of a data set
Arithmetic Mean (Mean)
the measure of center obtained by adding the values and dividing the total by the
number of values
What most people call an average.
Notation
S
deno

Histogram Notes
The bars on the horizontal scale are labeled with one of the following:
(1) Class boundaries
(2) Class midpoints
(3) Lower class limits (introduces a small error)
Horizontal Scale for Histogram: Use class boundaries or class midpoints.
Ver

Intro to Stats (Section 4)
Misuses of Statistics
1.
Evil intent on the part of dishonest people.
2. Unintentional errors on the part of people who dont know any better.
Voluntary response sample
(or self-selected sample)
one in which the respondents them

Section 2 Notes
Sensitive to extremes
because it uses only the maximum and minimum values, so rarely used
Symmetric
distribution of data is symmetric if the
roughly a
left half of its histogram is
mirror image of its right half
Skewed
distribution of d

Section 3-2 Notes
Range rule of thumbs is based on the principle that for many data sets, the vast majority
(such as 95%) of sample values lie within two standard deviations of the mean.
To roughly estimate the standard deviation from a collection of know

Section 3-4 Notes
A boxplot (or box-and-whisker-diagram) is a graph of a data set that consists of a
line extending from the minimum value to the maximum value, and a box with
lines drawn at the first quartile, Q1; the median; and the third quartile, Q3.

Chapter 1 (Intro to Statistics)
Data
collections of observations (such as measurements, genders, survey responses)
Statistics
is the science of planning studies and experiments, obtaining data, and then
organizing, summarizing, presenting, analyzing, in

Boxplots Notes
This section introduces measures of relative standing, which are numbers
showing the location of data values relative to the other values within a
data set.
They can be used to compare values from different data sets, or to
compare values w

Practice test question for
Section 4.2
When a fair die is rolled, the probability that a 4 comes up is 1/6. If the die
is rolled three times, what is the probability that at least one four comes
up?
A
B
C
D
E
4/6
(1/6)3
(5/6)3
1 (5/6)3
None of the above.

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