Student Name _ | TA Name: _ | Section Time _
For practice only!
every midterm is different.
PSTAT 5LS Extra problems to practice for Midterm 1
Time allowed: 45 mins. No notes.
Please note that the actual Spring 2013 midterm 1 for PSTAT 5LS will have sligh

PSTAT 5LS: Homework 3 Solutions
Question 1.
a) cfw_Male, Female
b) cfw_all integers between 6 and 20 or cfw_6,7,8,9,10,11,12,13,14,15,16,17,18,19,20
c) cfw_real numbers between 2.5 and 6
d) cfw_any reasonable range for maximum heart rate in beats per minu

CHAPTER 2 SOLUTIONS
2.13 Cesium-137 is a waste product of nuclear reactors. A study examined the cesium-137 tissue
concentration of a random sample of 15 Pacific bluefin tuna, Thunnus orientalis, captured off the coast
of California four months after the

CHECK YOUR SKILLS Chapter 3 SOLUTIONS
3.13 You have data for many individuals on their walking speed and their heart rate after a 10-minute
walk. When you make a scatterplot, the explanatory variable on thex axis
(a)is walking speed.
(b)is heart rate.
(c)

12.25. (a) Binomial is reasonable, 71. = 8. (b) A binomial distribution is reasonable
here; a large city will have a population much larger than 100 (n, the sample size).
(c) Binomial is reasonable, n = 24. During the winter time, the probability of seein

Solutions for HW4
Q1
Let A= the pair chosen is red; B = the second pair chosen is red. Note that A and B are
independent since this experiment is with replacement.
P(A and B) = P(A)P(B)=(1/5)^2=1/25
Q2
(9/10)^3= 0.729
Q3
a) Chance is 3/5
b) Chance is 30/5

120
Chapter 11
The Normal Distributions
Chapter 11 Solutions
11.1. Students may at first make mistakes such as
drawing a half-circle instead of the correct bellshaped curve, or being careless about locating the
change-of-curvature (inflection) point.
150

Solutions
1
Chapter 12 Solutions
12.1. Yes: (1) We have a xed number of observations (n = 15). (2) It is reasonable to
believe that each call is independent of the others. (3) Success means reaching a live
person; failure is any other outcome. (4) Each ra

CHAPTER 1 SOLUTIONS
1.13 A study records the sex and weight (in kilograms) of 30 recently born bear cubs in Alaska. Which of
the following statements is true?
(a)Sex and weight are both categorical variables.
(b)Sex and weight are both quantitative variab

Student Name:
TA Name:
Section Time:
PSTAT 5LS: More Practice Problems for Midterm 1.
20 Points maximum score. (Score based on 17 questions, three of which have parts (i) and (ii).
1. Suppose you have two variables recorded for each of n hospital patients

Welcome to PSTAT 5LS:
Statistics for Life Sciences
Chapter 10. General rules
of probability
1
Objectives
p
p
p
p
p
p
Independent events
Conditional probability
Multiplication rule
Tree diagrams
Medical testing and disease probabilities
B

Welcome to PSTAT 5LS:
Statistics for Life Sciences
Chapter 7. Samples and
observational studies
1
Topics
p
Observation versus experiment, confounding
p
Population and sample, parameter and statistic
p
The role of randomness in sampling

Welcome to PSTAT 5LS:
Statistics for Life Sciences
Chapter 9. Introducing Probability
1
Objectives
p
p
p
p
p
p
p
Randomness and probability
Probability models
Discrete vs. continuous sample spaces
Probability rules
Random variables
P

Welcome to PSTAT 5LS:
Statistics for Life Sciences
Chapter 8. Designing Experiments
1
Chapter 8 Designing Experiments
p
Experimental terminology
p
Comparative, randomized experiments
p
Completely randomized designs
p
Block designs
p
Matched

Welcome to PSTAT 5LS:
Statistics for Life Sciences
Chapter 3. Relationships:
Scatterplots and Correlation
1
Topics
We are dealing with two variables in Chapters
3 and 4.
p
Displaying relationships: scatterplots
p
Interpreting scatterplot

Welcome to PSTAT 5LS:
Statistics for Life Sciences
Chapter 2. Describing Distributions
with Numbers
1
Topics: Chapter 2 considers quantitative variables
mean and median
quartiles & standard deviation,
the inter-quartile range (IQR)
The five-number summary

Welcome to PSTAT 5LS:
Statistics for Life Sciences
Chapter 4. Regression
1
Topics
p
The least-squares regression line
p
Finding the least-squares regression line
p
The coecient of determination, r 2
p
Outliers and inuential observatio

Welcome to PSTAT 5LS:
Statistics for Life Sciences
Chapter 1. Picturing Distributions
with Graphs
1
Topics
p Individuals and variables
p Two types of data:
categorical and quantitative
p Charts for categorical data: bar gra