Homework #3
Statistics II
Ryan Sweeney and Munin Sahal
Sleep (hours)
1. It is generally recommended that adults sleep at
least 8 hours each night. Dr. Schultz asked her
students on the first day of class this semester
how many hours they had each slept th
Homework #3
Statistics II
Ryan Sweeney and Munin Sahal
1. It is generally recommended that adults sleep at least 8 hours each night. Dr. Schultz
asked her students on the first day of class this semester how many hours they had
each slept the previous nig
Homework #2
Statistics II
Ryan Sweeney and Munin Sahal
(Answers are red to better differentiate between the questions and answers)
1. Arsenic-based additives are included in the diets of about 70% of the 9 billion broiler
chickens produced annually in the
Homework 6
Statistics 2
Ryan Sweeney
Distributions
Time
1. Test the Hypothesis that there is a
difference between the mean lifetimes
of generic and brand-name AA
batteries. Use a two-sample t test with a
significance level of =.05
a) Identify the claim to
Exploring the Gender Wage Gap
Ryan Sweeney
Statistics 2
Distributions Gender=Female
Salary
1. The advantage of using the narrowly defined
data set is that it accounts for the salaries of different
jobs. By keeping all the making sure all the subjects
have
Homework #3
Statistics II
Ryan Sweeney
Distributions
Caffeine (mg)
1. Researchers at the University of
Florida investigated the level of
caffeine in 16-ounce cups of Starbucks
coffee. During one phase of the
experiment, cups of Starbucks
Breakfast Blend w
Homework 13
Statistics 2
Ryan Sweeney
Cockroaches:
1.
Group
Trial
Adult Male
Adult Female
Pheromone
N=20
N=20
Control
N=10
N=10
It is not all balanced as the two factors are not equal.
Gravid
N=20
N=10
Nymphs
N=20
N=10
2. A 2 x 4 two-way ANOVA will be use
Homework 14
Statistics 2
Ryan Sweeney
1)
Handfoot
Bivariate Fit of Hand Span By Height
a) The scatterplot is fairly scattered,
implying a weak correlation between
hand span and height. It does appear to be
a positive correlation, however. Despite
the very
Exploring the Gender Wage Gap
Ryan Sweeney
Statistics 2
Distributions Gender=Female
Salary
1. The advantage of using the narrowly defined
data set is that it accounts for the salaries of
different jobs. By keeping all the making sure
all the subjects have
Homework 6
Statistics 2
Ryan Sweeney
Distributions
Time
1. Test the Hypothesis that there is a
difference between the mean lifetimes
of generic and brand-name AA
batteries. Use a two-sample t test with a
significance level of
a)
Identify the claim to be
t
Homework #3
Statistics II
Ryan Sweeney
Distributions
Caffeine (mg)
1. Researchers at the University of
Florida investigated the level of
caffeine in 16-ounce cups of
Starbucks coffee. During one
phase of the experiment, cups of
Starbucks Breakfast Blend w
EXCEL DATA ANALYSIS
DESCRIPTIVE STATISTICS
1. Click the data tabs Data Analysis command button to tell Excel you want to calculate descriptive
statistics.
2. In the Data Analysis dialogue box, highlight the Descriptive Statistics entry in the Analysis Too
Ryan Sweeney
Homework 10
Statistics 2
Investment Problem:
Managerial type
Public-Sector
Private-Sector
Column Total
Investment Type
Aggressive
165
238
403
Balanced
155
142
297
Row Total
320
380
700
1.
Claim: The proportion of public-sector managers with a
Homework 13
Statistics 2
Ryan Sweeney
Cockroaches:
1.
Group
Trial
Adult Male
Adult Female
Pheromone
N=20
N=20
Control
N=10
N=10
It is not all balanced as the two factors are not equal.
Gravid
N=20
N=10
Nymphs
N=20
N=10
2. A 2 x 4 two-way ANOVA will be use
Ryan Sweeney
Blackboard Chapter 8 Assignment
Page 513, 8.16
a) The expected value of the sample weight mean is 150 pounds.
27
x = =
=6.75
b)
The standard deviation of the sampling distribution of
n 16
the sample mean weight is 6.75 pounds.
2500
=156.25
Nico Rivera
Stats II HW3
Q1
-No obvious lurking variable
-SRS
-independent
14.37/12.36=1.16<2 pooled
H0: A - C =2 HA: A - C > 2
T=2.48 P-value =.007 Df= 61
So since p-value .007<.05 We Reject H0 and prove that the Atkins diet is not worth licensing.
Q2
a)
Nico Rivera
Lab01
STAT02-9:25
Variable 1
1)
The distribution is not normal shaped with roughly 7 outliers
showing on the plot indicating a skew to the left.
2)
Data is skewed left.
Data on y axis: The string of points will bend down as you move to the rig
Nico Rivera
Lab 9 STATS II UMA
a) Describe the relationship in terms of direction, form, strength, and indicate any
unusual points?
-Positive, linear, moderately strong and no unusual points.
b) Give an interpretation of the slope within the context of th
Nico Rivera
Stats II HW3
Q1
-No obvious lurking variable
-SRS
-independent
14.37/12.36=1.16<2 pooled
H0: A - C =2 HA: A - C > 2
T=2.48 P-value =.007 Df= 61
So since p-value .007<.05 We Reject H0 and prove that the Atkins diet is not worth licensing.
Q2
a)
Nico Rivera
HW 01-STAT02 Sept 10
Q1: Each of the following paragraphs calls for a statistical test about a population mean m.
State the null hypothesis H0 and the alternative hypothesis Ha in each case
(a) Population mean spindle diameters m
Null Hypothes
Ryan Sweeney
Black Board Chapter 9
546) 9.16
b.)
^p=
.281.65
c.)
722
=.18
4013
.282.58
z 2 =1.65
.28 ( .72 )
.28 ( .72 )
< p <.28+1.65
=.268< p <.292
4013
4013
.28 ( .72 )
.28 ( .72 )
< p <.28+2.58
=.262< p <.298
4013
4013
It would be a
wider interval.
54
Homework 14
Statistics 2
Ryan Sweeney
1)
Handfoot
Bivariate Fit of Hand Span By Height
a) The scatterplot is fairly scattered,
implying a weak correlation between hand span
and height. It does appear to be a positive
correlation, however. Despite the very