Stat 240 Worksheet 1-Monday
1. Indicate whether each of the following constitutes data collected from a population or a sample.
a.
b.
c.
d.
Salaries of CEOs of all companies in New York City
Five hundred houses selected from a city
Gross sales for 2012 of

Worksheet Chapter 8 and 9
Chapter 8.3 Confidence Intervals for a population mean - population standard deviation not given
1. Find the value of t from the t distribution table for each of the following.
a. Confidence level = 99% and df = 13
b.Confidence l

Additional homework 2 solution
1.
You dont need to make the probability tree , since events are independent. (as we did in class)
3. Part a (I will scan the complete solutions)
e) P( F U) = 0.0306 0 , the events are not mutually exclusive
f) P( F |U) = 0.

Chapter 3-5
( xi x )2
s
n 1
2
E(x) = x P(x)
x P( x)
2
n
Cx
n!
x!(n x)!
np
P( x) n C x p x q n x
and
2
Chapter 6
Chapter 7
x and x
X
p
N
and
n
x
p
n
x
x
p
p p
pq
n
Chapter 8
x z x
x tsx
where sx
p zs p
x
x
s
n
s p
Chapter 9
where x
E tsx
p

Chapter 8 - Estimation of the mean and proportion Condence Intervals.
8.2 Estimation of a population mean: u eknown .
Always check assumptions first
Case I. If the following three conditions are fulfilled:
Random Sample
The population standard deviation 0

Additional Homework 2 due Thursday, March 10
1. A contractor has submitted bids for two state construction projects. The probability of winning each contract is .25,
and it is the same for both contracts. Draw a tree diagram for this problem
a. What is th

Stat 240 Binomial Additional Problems
1.
An airline sells 100 tickets for flight with 98 seats because, on average, 2% of purchasers of
airline tickets do not show up for the departure of their flight.
(a) Let J represent the number of people who show up

Sampling and sampling distributions.
Chapter 7
Parameters are numerical descriptive measures for
populations (fixed, often unknown values)
For instance: For the normal distribution: the parameters
are location and shape , described by and .
For the binom

Worksheet 9
1.
A company employs a total of 16 workers. The management has asked these employees to select 2 workers who
will negotiate a new contract with management. The employees have decided to select the 2 workers randomly.
How many total selections