SANG LE
STAT 252- S1
LAB 4
1.
A,
In this scatterplot, the notion that species with larger number of nesting pairs will tend to
survive longer is true because of the positive slope in the plot.
The pattern of association is the same for each size. As can b
SANG LE
STAT 252- S1
LAB 2
1. A,
The main purpose of the study is the clarify the usefulness of serum lipidbound sialic acid (LSA) in detecting and monitoring breast cancer.
According to the data and the description of the study, this is an
experimental s
SANG LE
STAT 252- S1
LAB 1
1. From the study, we can see that this is a randomized experiment as the researcher assigns the
subjects into different treatment groups in order to get the desired results. In this case, the
assignment of treatment does not ge
SANG LE
STAT 252- S1
LAB 3
1. A,
This is an observational study as there is no indication of treatment groups,
only observational group for assessment and in this study, the age of the
subject is beyond the control of the investigators as ages might be a
Descriptive Statistics
N
Minimum
Maximum
Mean
Std. Deviation
MidPct
44
27.451
100.000
75.80214
19.431269
FinalPct
44
31.818
98.701
75.92975
18.753867
Valid N (listwise)
87
b
Model Summary
Model
R
1
.801
R Square
a
Adjusted R
Std. Error of the
Square
Estim
1.
(a)
X= amount of ml in a randomly selected bottle.
mean = 302 ml, standard deviation= 2 ml
P ( X < 300) = P ( Z = X < 300 302 ) = P ( Z < 1) = 0.158655
Approximately 15.87% of bottles at the mean of 302 ml will be underfilled.
Using the COUNTIF functio
1.
a) when sigma is increased, the maximum point decreases and the left and right
edges increase making the graph increasingly flat. An increase in the standard
deviation means the strength of each alloy is less consistent and it results in more
unfavorab
1.
a)
P=0.779
b)
x=1 mean=0.25
1 P(X=<x)=1-0.9735=0.0265
c)
P=0.765
d)
Increasing , starts to skew the graph in the other direction.
The increase implies that there are is a much greater probability of
having a tile with a flaw, due to having a much highe
1.
a)
recession velocity at certain distances
1200
1000
800
600
recession velocity
400
200
0
-200
0
0.5
1
1.5
2
2.5
-400
distance
b)
Relatively strong, positive, quite linear, no unusual observation
2.
a) 0.789639
b) sign of the correlation is positive, m
1.
a) Factor which affect distance traveled are HEAD, CARRY, MODEL and
possibly TEMP. HEAD, CARRY and MODEL ARE all controllable where as
TEMP is not. Launching the second model after each first model ensure
conditions stay the same for the second model.
Stat 151 Midterm Version 222
LAST NAME: _
FIRST NAME: _
STUDENT ID: _
STAT 151 SECTION: _
Instructions:
1) Personal items must be placed aside prior to the start of the exam.
2) All portable electronic devices must be turned off, including cell phones, pa
Statistics 252 Topic 5 Examples Mike Kowalski
Topic 5 Case Study 2: GPA vs SAT, HIGH SCHOOL, and GENDER
A highly respected mathematics department at a large university, accepting
thousands of applications, wants to accept only those students who will
succ
Data analysis for League Attendance by League
ANOVA of 1-mean model vs. I-mean model
ANOVA
atthun
Sum of Squares
Between Groups
Within Groups
Total
df
Mean Square
170285.969
4
42571.492
16552.194
68
243.415
186838.163
72
F
174.893
Sig.
.000
Contrasts
Mult
1. Do any of the variables have an effect on mean midterm mark?
2. Does study have an effect on mean midterm mark, after accounting for the
other variables?
3. Does study have a positive effect on mean midterm mark, after accounting for
the other variable
Topic 4: Simple Linear Regression
Goal : To describe Y given X a numerical
explanatory variable.
1
Outline
1. The SLR Model
2. Inference for Single Regression Coefficients:
t-test for Linear Significance
C.I. for the effect of X on Y.
3. Confidence Estima
Statistics 252 Homework # 4 Winter 2017
STAT 252 Homework 4 (60 marks) Due Thursday, April 6 at 10 PM
1) (22 marks total) Persistent patent ductus arteriosus (PDA) is a medical condition that affects many very
low-birth weight infants. Infants with PDA ha
LAB 2 ASSIGNMENT
PROBABILITY DISTRIBUTIONS
In this lab assignment you will use numerical and graphical tools available in Excel to examine the process of
manufacturing of ultra-strong alloys used in fasteners, springs and instrument parts. You will use th
LAB 1 ASSIGNMENT
DISPLAYING AND DESCRIBING DISTRIBUTIONS
In this lab assignment you will learn how to apply graphical and numerical tools in Excel to analyze data
produced in a simple experiment. In particular, you will display the distance traveled by a
LAB 5 ASSIGNMENT
LINEAR REGRESSION AND CORRELATION
In this lab assignment you will use simple linear regression to examine the relationship between distance
from the earth and the recession velocity of galaxies. In particular, you will use scatter plots t
SECTION 2: ONE OR TWO POPULATION MEANS
2.1 Inferences for One Mean (The One-Sample Case)
Often we make inferences about one population, based on one sample
One sample inferences may be of two types:
o Inferences about one mean
o Inferences about one propo
SECTION 4: SIMPLE LINEAR REGRESSION AND SIMPLE LINEAR CORRELATION
Linear Regression and Linear Correlation
analyze the relationship between quantitative variables
Simple means only two variables (x and y) are involved
In the next section, we will discuss
SECTION 3: SEVERAL POPULATION MEANS
The purpose of Analysis of Variance (ANOVA) is to compare several (more than two) groups or
means that is, to find the difference among more than two groups
Measurements of only one variable are recorded, but they come
SECTION 6: TWO-FACTOR ANOVA
Factorial design involves two or more factors affecting the response variable and each factor has
two or more levels
When there are two factors affecting the response variable, it is known as two-factor ANOVA
Just like one-fact
SOLUTIONS TO LAB 4 ASSIGNMENT
Question 1
(a)
Let X be the amount of drink in a randomly selected bottle. Then given the mean of 302 ml,
standard deviation of 2 ml, and the normality of X, we have
P( X 300) P(Z
X
300 302
) P( Z 1) 0.158655.
2
The probabi
SOLUTIONS TO LAB 1 ASSIGNMENT
Question 1
(a)
The distance traveled by a golf ball in the experiment is affected by many factors among them ball
size, weight, dimple pattern (dimples cause the air flow to cling to the ball, allowing the ball to
travel fast
SOLUTIONS TO THE LAB 2 ASSIGNMENT
The lab assignment is based on four interactive templates that extend the functionality of Excel and
simplify its use. In order to eliminate the possibility of deleting mistakenly charts and formulas in the
templates, som
SOLUTIONS TO THE LAB 3 ASSIGNMENT
Please note that in order to eliminate the possibility of deleting mistakenly charts and formulas in the
worksheets, some cells and interactive charts are protected and therefore read-only.
Question 1
(a)
In order to obta
Stat 252 Homework # 3 Winter 2017
STAT 252 Homework 3 (60 Marks) Due Monday, March 27 by 10pm
Show all your work and include appropriate justification to receive full credit for a solution. Single
numerical answers (unless indicated) will not receive any
STAT 266 problems
Winter 2017
"Now I have heard that you are able to give interpretations and to solve difficult problems.
If you can read this writing and tell me what it means, you will be clothed in purple and
have a gold chain placed around your neck,
STAT 266 - Chapter 6 & 7 Exam solutions
1. A system has four independent electronic components linked as shown. Find the
average lifetime of the system, where the lifetime of each component is a uniform(0,1)
random variable.
Y
W
X
Z
Solution: Let W, X, Y,