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Question 1
llowsky Page 505 Ex 77
An article in the
San Jose Mercury News
stated that students in
the California state university system take 4.5 years, on average,
to finish their undergraduate degrees.
Suppose you believe that the mean time is longer. You conduct a
survey of 49 students and obtain a sample mean of 5.1 with a
sample standard deviation of 1.2 and then perform a hypothesis
at a 1% significance level using the Critical Value procedure.
What is the null and alternate hypothesis for this hypothesis test?
a Ho: μ = 4.5, Ha: μ > 5.1
b Ho: μ = 4.5, Ha: μ < 5.1
c Ho: μ = 4.5, Ha: μ > 4.5
d Ho: μ = 4.5, Ha: μ < 4.5
________
What is the numerical value of
α
for this test?
Enter answer as a 2 place decimal with a 0 to the left of
the decimal point.
Do not enter answer as a percent.
________
What is the appropriate distribution for performing this
test?
a z distribution
b t distribution
c Either distribution
d Neither. This question does not depend on knowing
the appropriate distribution.
Select and enter the appropriate letter
________
What is the critical value for the test statistic?
Enter answer as a 3 place decimal rounded to 3 decimal places.
________
What is the numerical value of the test statistic?
Enter answer as a decimal rounded to 1 decimal place.
________
Based upon the Hypothesis test what is your decision?
a There is insufcient evidence, based upon the data,
to accept the alternate hypothesis.
b There is sufcient evidence, based upon the data, to
accept the alternate hypothesis.
c It is not possible to make a decision (null or
alternate), based upon the data.
d A strong case could be made For either decision (null
or alternate) based upon the data.
________
Question 2
llowsky Page 505 Ex 77
An article in the
San Jose Mercury News
stated that students in
the California state university system take 4.5 years, on average,
to finish their undergraduate degrees.
Suppose you believe that the mean time is longer. You conduct a
survey of 49 students and obtain a sample mean of 5.1 with a
sample standard deviation of 1.2 and then perform a hypothesis
at a 1% significance level using the Pvalue procedure.l.
What is the null and alternate hypothesis for this hypothesis test?
a Ho: μ = 4.5, Ha: μ > 5.1
b Ho: μ = 4.5, Ha: μ < 5.1
c Ho: μ = 4.5, Ha: μ > 4.5
d Ho: μ = 4.5, Ha: μ < 4.5
________
What is the numerical value of α for this test?
Enter answer as a 2 place decimal with a 0 to the left of the
decimal point.
Do not enter answer as a percent.
________
What is the appropriate distribution for performing this test?
a z distribution
b t distribution
End of preview
Introductory Statistics
OpenStax College
Rice University
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follows:
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Introductory
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their respective owners.
ISBN-10
1938168208
ISBN-13
978-1-938168-20-8
Revision
ST-1-000-RS
End of preview
Introduction to Statistics
Online Edition
Primary author and editor:
David M. Lane
1
Other authors:
David Scott
1
, Mikki Hebl
1
, Rudy Guerra
1
, Dan Osherson
1
, and Heidi Ziemer
2
1
Rice University;
2
University of Houston, Downtown Campus
Section authors speciFed on each section.
........................................................................................
1. Introduction
10
..............................................................................................
What Are Statistics
11
......................................................................................
Importance of Statistics
13
...........................................................................................
Descriptive Statistics
15
.............................................................................................
Inferential Statistics
20
..............................................................................................................
Variables
26
...........................................................................................................
Percentiles
29
.......................................................................................
Levels of Measurement
34
........................................................................................................
Distributions
40
..........................................................................................
Summation Notation
52
......................................................................................
Linear Transformations
55
..........................................................................................................
Logarithms
58
...............................................................................................
Statistical Literacy
61
..............................................................................................................
Exercises
62
.......................................................................
2. Graphing Distributions
65
..........................................................................
Graphing Qualitative Variables
67
........................................................................
Graphing Quantitative Variables
76
......................................................................................
Stem and Leaf Displays
77
..........................................................................................................
Histograms
83
............................................................................................
Frequency Polygons
87
.............................................................................................................
Box Plots
93
.........................................................................................................
Bar Charts
102
......................................................................................................
Line Graphs
106
...........................................................................................................
Dot Plots
110
.............................................................................................
Statistical Literacy
114
.........................................................................................................
References
116
............................................................................................................
Exercises
117
...............................................................
3. Summarizing Distributions
124
..............................................................................
What is Central Tendency?
125
.........................................................................
Measures of Central Tendency
132
............................................................................................
Median and Mean
135
.......................................................
Additional Measures of Central Tendency
137
.....................................................
Comparing Measures of Central Tendency
141
.....................................................................................
Measures of Variability
145
.....................................................................................
Shapes of Distributions
153
2
End of preview
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