Stat 205 Homework 1 (Due: January 27)
Instructor: Yanyuan Ma
Submission instruction:
Paste the plot from R in a word file, type the other answers, comments etc. in the same file.
Put your name on the top line and print the solution to submit it in the cla
Exam 2 KEY
Statistics 110, Fall 2013 FORM B
Directions: Read each question carefully and select the best response. Be sure to match your response to the
appropriate number on the scantron sheet. Each question is worth 4 points.
Questions 1 3 are based o
Stat 205 Homework 1 (Due: September 3rd )
Instructor: Yanyuan Ma
Submission instruction:
Paste the plot from R in a word file, type the other answers, comments etc. in the same file.
Put your name on the top line and print the solution to submit it in the
Chapters 1-4 Review STA2023
Name_
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) What is the median of the following group of scores?: 1, 2, 2, 3, 4, 4, 4, 6, 8, 10
A) 3.5
B) 5.5
C) 4
D) 3
1)
2) W
1. 9.2.5(a,b) use binom.test in R; show your code.
binom.test(0.164, 0.250)
We are 95% confident that the probability of adverse reaction in infants who receive their first injection
of vaccine is between 0.164 and 0.250.
2. 9.4.3 use binom.test in R; sho
Homework #5
Griffin Zink
1) a. It appears the males that survived had larger wings
b.
The data is approximately normal in each group.
c. Population 1 is the 24 adult male sparrows that perished, 1=727.92. Population 2 is the 35
adult male sparrows that su
Griffin Zink
STAT 205 T/Th 1:15-3:30PM
1) Based on the histogram, the graph is unimodal because it has only one peak. The graph is also
skewed right and not symmetrical.
2) By looking at the boxplot only one outlier exists. 57 is the only outlier because
Homework #4
Griffin Zink
1) t = 27.088, df = 7, p-value = 2.396e-08
alternative hypothesis: true mean is not equal to 0
95 percent confidence interval:
2.076406 2.473594
sample estimates: mean of x =2.275
2) a.
We can assume the data in each plot is norma
Introduction, Evidence, and Sampling
Motivation: Why analyze data?
Clinical trials/drug development: compare existing treatments with new methods
Agriculture: enhance crop yields, improve pest resistance
Ecology: study how ecosystems develop/ to environme
Name _
Pechenik Worksheet: Writing Laboratory and Other Research Reports
Chapter 9
20 points possible
True or False: (1 pt each)
1.
T
F
You should never present the same data in both a graph and a table.
2.
T
F
You should leave the interpretation of your
Griffin Zink
Write up the first two problems on one page, and the last two problems on another page
1. Exercise 7.5.13, six bar wrasse data. Carefully define 1 and 2, and state the null and (onesided) alternative hypotheses for this problem. Do you need t
STAT HW #3 Cora Petyak
1. > dbinom(0,4,.42)
[1] 0.113165
> dbinom(1,4,.42)
[1] 0.3277882
> dbinom(2,4,.42)
[1] 0.3560458
The probability of having type A blood when Y=0 is 0.113165.
The probability of having type A blood when Y=1 is 0.3277882.
The probabi
Griffin Zink
1. Prepare side-by-side boxplots. Which growing condition produces the longest shoots, which produces
the shortest?
Growing the radish in complete darkness produces the longest shoots, while growing radish in light produces
the shortest shoot
Griffin Zink
STAT205 T/Th 1:15-2:30
HW #2
1. The flowing are the 2-week weight gains (lb) of 11 young lambs of the same breed that had
been raised on the same diet:
1
2
5
7
10
10
Mean: 15
,
Variance: 334.4
11
13
19
20
67
a. Compute 5 number summary.
Min-
NAME:
Stat 205 Quiz 4
1. In the United States, 42% of the population has type A blood. Consider taking a sample of
size n = 4. Let Y denote the number of persons in the sample with type A blood.
(a) (3 points) What is P (0 Y 2) = P (Y 2), the probability
Introduction, Evidence, and Sampling
Motivation: Why analyze data?
Clinical trials/drug development: compare existing treatments with new methods
Agriculture: enhance crop yields, improve pest resistance
Ecology: study how ecosystems develop/ to environme
Description of Samples and Populations
Random Variables
Data are generated by some underlying random process or phenomenon. Any datum (data
point) represents the outcome of a random variable. We represent random variables with
capital letters, usually X,
ProbabilityandtheBinomialDistribution
Definition:Aprobabilityisthechanceofsomeevent,E,occurringinaspecifiedmanner.
NOTATION:Pcfw_E
WecanviewprobabilitiesfromaRelativeFrequencyInterpretation
P cfw_E =
# ways E occurs
# total ev nts
ve
Example3.2.5Consider
TheNormalDistribution
DefinitionAcontinuousrandomvariablehasanormaldistributionifitsprobabilitydensity
functioncanbewrittenasfor<y<as f ( y ) = Y 1 2 e - ( y - ) / 2
2
Y
2
Y
Notation:Y~N(Y,Y2)whereYisthepopulationmeanandY2isthepopulationvariance
Examples
Comparing ps
Dr. Don Edwards notes (slightly edited and augmented)
The Odds for Success
When the experiment consists of a series of n independent trials, and each trial may end in
either success or failure, and the probability of success p on any given tr
Name _
Scientific Paper Quiz
Read the entire assigned article prior to answering the questions below. It is possible that the paper does not include the item in
question. If you believe the
Section 7.2 The t test
Section 7.1 Randomized test
Sections 7.1 and 7.2
Elementary Statistics for the Biological and Life Sciences
(Stat 205)
1 / 23
Section 7.2 The t test
Section 7.1 Randomized test
Hypothesis testing
Often scientists wish to test a hypo