1. A random sample of size 36 from a normal population yields mean X-bar = 32.8 and standard
deviation s = 4.51. Construct a 95 percent confidence interval for . (Ch9)
2. Test at = 0.05, the hypotheses H0: = 0.33 versus HA: < 0.33 with p = 0.23 and n=100
Chapter 7
Confidence Intervals
True/False
1. The t distribution always has n degrees of freedom.
Answer: False Difficulty: Easy
2. Assuming the same level of significance , as the sample size increases, the value of t/2
approaches the value of z/2.
Answer
Homework 5(Dennis)
1. What does the Central Limit Theorem tell us about the sampling distribution of the sample mean?
Solution: If the sample size n is sufficiently large, then the population of all sample
means is approximately normal.
2. Suppose that we
BA 302: Assignment 3-solutions: Chapters: 8, and 9: Total 75 points
Due by Midnight (11:59 pm), Monday, April 11th, 2016
True / False Questions (1 point each)
Chapter 8
1. The sampling distribution of
X
must be a normal distribution with a mean 0 and stan
Eco 302: Assignment 4: Solutions- Chapters: 10 and 13: Total 75 points
Due by Midnight (11:59 pm), Monday, May 2nd, 2016
True / False Questions (1 point each)
Chapter 10
1. The closer the hypothesized mean is to the actual mean the greater the power of th
Eco302-01E Final Test: due by midnight of Monday, May 9th, 2016
Total 400 points
T/F (6 points each)
Question 1. In simple regression analysis, R2 measures the proportion of the variation
explained by the simple linear regression model. (Ch13)
Question 2.
Eco 302-01E-Spring 2016 Midterm- Test due by Midnight of Friday, March 11, 2016
Total points 300
T/F (4 points each)
1.
2.
3.
4.
Credit score is an example of a ratio scale variable.(Ch1)
If events A and B are independent, then P(A|B) is always equal to z
Example 1:
X: 2, 5,6,8,9,10,12,13, 10, 7, 5, and 3; the calculated Mean
X
Xi X
2
5
6
8
9
10
12
13
10
7
5
3
90
2-7.5
5-7.5
6-7.5
8-7.5
9-7.5
10-7.5
12-7.5
13-7.5
10-7.5
7-7.5
5-7.5
3-7.5
0
X
is 90/12 = 7.5, and n =12.
(Xi X )2
30.25
6.25
2.25
0.25
2.25
6.2
How to build Contingency Table from Information in Text form and answer
probability questions?
Suppose 600 people were randomly selected in a study about college graduation
and employment status. Only 250 were found to have college degree and in total
100
Additional examples for chapter 10
Hypothesis Test for the Mean of a Normal Distribution when is Known:
Example 2: The apples from a particular Sun & Shine farm in California are
known to weigh 150 grams on average with a variance of 49 and have a normal
BA 302: Assignment 2-Solution: Chapters: 5, 6, and 7: Total 75 points
To be emailed by Midnight (11:59 pm), Monday, March 7th, 2016
TRUE/FALSE (1 POINT EACH)
Chapter 5
1. Mutually exclusive events cannot be independent. TRUE Occurrence of one makes the
pr
1
BA 302: Assignment 1: Chapters: 1, 2, and 3: Total 75 points
To be emailed by Midnight (11:59 pm), Monday, Feb 8th, 2016
True/False Questions carry 1 point each, Multiple Choices carry 2 points each and the
Essay type questions carry 7 points each. The
BA 302: Assignment 3: Chapters: 8, and 9: Total 75 points
To be emailed by Midnight (11:59 pm), Monday, April 11th, 2016
True / False Questions (1 point each)
Chapter 8
1. The sampling distribution of
X
must be a normal distribution with a mean 0 and stan
Chapter 6
Discrete Probability Distributions
True/False
1. The Poisson probability distribution is always negatively skewed.
Answer: False
Difficulty: Easy
Goal: 6
2. A random variable is assigned numerical values based on the outcomes of an experiment.
A
Chapter 7
Continuous Probability Distributions
True/False
1. The Empirical Rule of probability can be applied to the uniform probability distribution.
Answer: False
Difficulty: Medium
Goal: 1
2. Areas within a continuous probability distribution represent
Chapter 8
Sampling Methods and the Central Limit Theorem
True/False
1. In stratified random sampling, a population is divided into strata using naturally occurring geographic
or other boundaries. Then strata are randomly selected and a random sample is co
Chapter 9
Estimation and Confidence Intervals
True/False
1. A point estimate is a single value used to estimate a population parameter.
Answer: True
Difficulty: Easy
Goal: 1
AACSB: AS
2. A point estimate is a range of values used to estimate a population
Chapter 4
Describing Data: Displaying and Exploring Data
True/False
1. A dot plot and a scatter diagram are different names for the same graph.
Answer: False
Difficulty: Easy
Goal: 1
2. A dot plot is an easy way to represent the relationship between two v