IC 10
IC 10
DS 73
Name:
1. Employees at a corporate headquarters own an average of 240 shares of the companys common stock,
with a standard deviation of 40 shares. For a random sample consisting of 50
IC 09
IC 09
DS 73
Name:
1. From a population that has a mean of 500 and a standard deviation of 35, we plan to take repeated samples
of 50 randomly selected elements.
a. What is the value of the mean
IC 03
Name:
DS 73
Use Problem I to answer questions 1 13 below.
Problem I. A company that produces and markets trash bags has developed an improved 30-gallon bag. The
new bag is produced using a speci
IC 08
IC 08
Name:
1. The daily water consumption for Riverton is normally distributed with
1.
a mean of 800,000 gallons and a standard deviation of 80,000 gallons. The
community water system will expe
IC 07
IC 07
Name:
1. Find the probability that a z-score will fall
at or below 1.32: P(z 1.32)
1.
2. Find the probability that a z-score will fall
between -0.42 and 1.32: P(0.42 z 1.32)
2.
3. Suppos
IC 02
Name:
DS 73
Problem I. The price/earnings ratio of a firm is a multiplier applied to a firms earnings per share to determine
the value of the firms common stock. For instance, if a firms earning
IC 05
IC 05
DS 73
Name:
Use Problem I to answer questions 1 4 below.
Problem I. A prior study estimated the 15% of athletes used performance-enhancing drugs. A university is
considering whether to tes
IC 06
IC 06
DS 73
Name:
Use Problem I to answer questions 1 7 below.
Problem I. An industry representative claims that 50 percent of all satellite dish owners subscribe to at least
one premium movie c
IC 04
IC 04
DS 73
Name:
Questions 1-10, use problem I.
Problem I. A study was conducted to evaluate the safety and efficacy of an antibiotic for
treating ear infections. A group of 100 adult patients
IC 01
Name:
DS 73
Problem I. A company that produces and markets trash bags has developed an improved 30-gallon bag. The
new bag is produced using a specifically formulated plastic that is both strong
1
(Ch. 10.5) and T-test for Two Means 1-2 (Ch. 10.1)
Relation between F-test for Two Variances
F-test for Two Variances (Ch. 10.5)
vs
df1 = n from larger S2 1; df2 = n from smaller S2 1
12
H
:
Do Rej
DS 123 Chapter 10 Part II-Comparing Two Proportions and Two Variances
Some Exercises (taken from Bowerman et al, 2014, and Anderson, et al, 2011)
Exercise10.6:Considerthehypothesistest:
H0:p1p20
Ha:p1
CSU, Fresno Name:
DS 123
Practice Test
1. Find the probability that a z-score will fall
between -0.18 and 2.18: P ( 0.18 z 2.18)
1.
2. Find the probability that a z-score will fall
between -1.26 and
Practice Test 1
QUESTION NUMBERS
area left of 2.18 0.985371
area left of -0.18 0.428576 0.556795
2
area left of 1.38 0.916207
area left of -1.26 0.103835 0.812372
3
area left of 2.47 0.993244 0.006756
Hypothesis Testing
1
Which of the following best describe the activity
Involved in Video 9a?
a.
Basketball
b.
Hockey
c.
Baseball
d.
Bowling
e.
Dancing
2
What was Sam's claim in Video 9a?
a.
b.
c.
d.
e
Michael Bento
DS 123 - Assignment #6
1. The task must include the following components: Null and alternative hypothesis, level of
significance (and its corresponding critical value(s), the test statis
Risk & Return Spreadsheet Example
Module V
Month
Dec. '11
Jan. 12
Feb.
March
April
May
June
July
Aug.
Sept.
Oct.
Nov.
Dec.
Jan. '13
6
March
April
May
June
July
Aug.
Sept.
Oct.
Nov.
Dec.
Name:
Date:
St
1. 1. First get rid of outliers (in Sales price) if any and test to see if the Sales Prices
are normally distributed. No graph required. (20 points)
H0: Data is from a normal distribution
H1: Data is
1. 1.Firstgetridofoutliers(inSalesprice)ifanyandtesttoseeiftheSalesPrices
arenormallydistributed.Nographrequired.(20points)
H0: Data is from a normal distribution
H1: Data is not from a normal distrib
Answers to Items 4 to 12 for Final Assignment
4 The estimated regression (Yhat) is
2.2706+0.0448x1+5.8049x2-0.3695x4
Both bedrooms and bathrooms seems to be important and should be in the
model, at le
Confidence Quantile
t
1.97301
Alpha
0.05
Analysis of Variance
Source
Race
Error
C. Total
DF
2
183
185
Sum of Squares Mean Square F Ratio Prob > F
53.1469
26.5735
3.2567 0.0408
1493.2019
8.1596
1546.34
Assignment #8
1. =IF(D2="A","M",IF(D2="O","M",IF(D2="AA","M",D2)
2.
Ho: New Race and Gender are independent
Ha: New Race and Gender are NOT independent
Level of significance:
=.05
Critical Value:
5.9
Subset of Spring17Data - Categorical by Gender Page 1 of 1
Responses( New Race) By Gender
Freq New Race
Share c H M Total
Responses
67
83
New Race
Share Chart
67
83
Response Sample Pearson Pearson
Confidence Quantile
t
Confidence Quantile
Alpha
1.97301 0.1
t
Analysis of Variance
Source
Race
Error
C. Total
Alpha
1.9728699 0.05
Analysis of Variance
DF Sum of SMean SF RatProb > F
2 53.1469 26.574
Descriptive statistics deals with tabular, graphical and numerical methods for information/dataset presentation, and looks for patterns in a
dataset.
Categorical data use labels or names to identify c
Project 8
1)
H1: Gender and Race are independent
H0: Gender and Race are not independent
Level of significance: 0.05
Critical Value: 5.991465
Test statistic: 2.1112
P-Value: 0.347984
Excel formula: IF