This data comes from problem 12.19 on page 505 in the book. Our independent variable(X) is number of
operators, and our dependent variable(Y) is wait time. There are answers in the back regarding the
correlation coefficient (r) for problem 12.3 on page 49
ANOVA Problem 11.5, Page 450
This is a typical one-way ANOVA hypothesis test for three means. Before proceeding with the actual
hypothesis test, you should first calculate the sample means, sample variances, grand mean, sums of
squares and Fcalc using a p
Comparing Two Variances: Steps in Hypothesis Testing
(Problem 10.39, page 426, Chapter 10)
1. Present the two competing hypotheses. From the problem, we
are trying to answer the question, Do these independent random
samples provide evidence that the new p
Steps in Hypothesis Testing
(Problem 10.3, page 401, Chapter 10)
1. Present the two competing hypotheses:
a. Null hypothesis: H0: 1- 2 = 0
b. Alternative hypothesis: H1: 1- 2 0
2. Establish the decision rule (in terms of t).
a. Select an level. This is th
Dynamics Of The Classical Approach To Hypothesis Testing
Problem 9.39, Page 363.
Test statistic: = 209
Is X far from = 216?
s= $13
Standardized test statistic: = 2.408
H0: $216
=0.05
= 209
Reject H0
HA: < $216
= 2.408
1-
X
$216
Fail to Reject H0
t.05,d
Steps in Hypothesis Testing
(Problem 9.39, page 363, Chapter 9)
Part (A) The Classical Approach
1. Present the two competing hypotheses:
a. Null hypothesis: H0: $216
b. Alternative hypothesis: H1: < $216
2. Establish the decision rule.
a. Select an level.
Steps in Hypothesis Testing
(Problem 9.23, page 357, Chapter 9)
1. Present the two competing hypotheses:
a. Null hypothesis: H0: = 10 ounces
b. Alternative hypothesis: H1: 10 ounces
2. Establish the decision rule.
a. Select an level. This is the level of
Dynamics Of The Classical Approach To Hypothesis Testing
Problem 9.23, Page 357.
X = 0.07oz
H0: = 10 ounces
Is X far from = 10?
Standardized test statistic: z = .78
1-
/2=0.025
/2=0.025
= 10 mg
Reject H0
HA: 10
Fail to Reject H0
z =.78
-z.025 =-1.96
10
Steps in Hypothesis Testing
(Problem 9.17, page 356, Chapter 9)
1. Present the two competing hypotheses:
a. Null hypothesis: H0: 3.5 mg
b. Alternative hypothesis: H1: > 3.5 mg
2. Establish the decision rule.
a. Select an level. This is the level of signif
Picture Presentation Of The Classical Approach To Hypothesis Testing
Problem 9.17, Page 356.
H0: 3.5 mg
1-
X = 0.18mg
=0.01
Is X far from = 3.5?
X
3.5 mg
Standardized test statistic: z = 2.50
Reject H0
Fail to Reject H0
z.01=2.33
z=2.50
H1: >3.5
1-
>3.
The P-Value Approach To Hypothesis Testing
Problem 9.17, Page 356
Reject H0
H0 True
Compare and p-value
Because p-value <
=0.01
P-value=0.0062
X
3.5 mg
Reject H0
Fail to Reject H0
z.01=2.33
0 = 3.5 mg
z
H0 True
=0.01
P-value=0.0062
0
2.33
Critical value
Confidence Intervals
(Problem 8.21, page 316, Chapter 8)
A random sample of 10 items is drawn from a population whose
standard deviation is unknown. The sample mean is =270 and the
sample standard deviation is s=20.
a) What do we know so far from the prob
Confidence Intervals
(Problem 8.13, page 309, Chapter 8)
A random sample of 25 items is drawn from a population whose
standard deviation is known to be = 40. The sample mean is =270.
a) So what do we know so far from the problem?
o =40 The standard deviat
Hi, All!
For your discussion on Friday in FinOpMgt 250/Res Ec 213, you will be
manipulating two key U.S. economic variables: Gross Domestic Product
(GDP) and Personal Consumption Expenditures.Both are reported in
billions of dollars and as quarterly measu
Assignment #1 Problem #1 Part 1: Liquidity/Short Term Solvency Ratios Current Ratio =CA/CL: 1.457803634 Quick Ratio: =(CA-Inv.)/CL: 0.862242333 Cash Ratio: =Cash/CL: 0.530297589 Asset Management/Turnover Ratios Inv. Turnover =COGS/Inv.: 8.246181058 D
Assumption for t and Z score same for proportion just use Z 1. Sample is drawn at random 2. The probability distribution is approximately normal Assumption for two populations 1. Probability distribution for both pops are approximately normal 2. Samp