1.
Solvetheproblem.
TheCentralLimitTheoremisconsidered
powerfulinstatisticsbecause_.
A. itworksforanypopulationdistributionprovidedthepopulationmeaniskn
B. itworksforanysampleprovidedthepopulationdistributionisknown
C. itworksforanysamplesizeprovidedthepo
Chapter 24
Comparing Means
Well learn about:
Sampling distribution for Difference between two
means
Two-sample t-test
Confidence interval and Hypothesis testing for
Difference in Means
Batteries: Generic vs. Name-brand
Whats better?
A statistics student
Chapters 24-25 Analysis of Quiz Results: Spring 2012
What assumptions must be met when doing a paired t-test for means?
I. The two groups must be independent.
II. The two groups are not independent; the data must be paired/matched.
III. The data for the t
Chapter 26
Contingency Tables and Hypothesis Tests of Independence
In Chapter 26 we study a hypothesis test that deals with two categorical variables, that is variables
indicating categories not numeric variables. To help understand the concepts of contin
Chapter 26 Analysis of Quiz Results: Spring 2012
The sampling distribution for 2 works well when expected counts are very
small.
A. True
B. False
Remember that one of the assumptions/conditions that we check is for expected cell counts. The chi-square
dis
Confidence Intervals and Hypothesis Testing for Two Means
Chapters 24 and 25
Introduction
In Chapters 24 and 25, we build on the concepts we learned about hypothesis testing to extend these
ideas to testing hypotheses about two means. Chapters 19 through
Chapter 23
Hypothesis Testing and Confidence Intervals for a Mean
Review
Chapters 20 and 21 introduce the concept of hypothesis testing. Here is a review of the terms and
concepts we used. Please reread these and think about the concepts based on what you
Chapters 23 Analysis of Quiz Results: Spring 2012
A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. The owner of the
store has determined that home delivery will be successful only if the average time spen
Chapter 20 Analysis of Quiz Results: Spring 2012
The U.S. Department of Labor and Statistics released the current unemployment rate of 5.3% for the month
in the U.S. and claims the unemployment has not changed in the last two months. However, the states
s
Chapter 19 Analysis of Quiz Results: Spring 2012
This question is a review of material covered in Chapter 12. We are reviewing it since we are beginning the study of
inferential statistics.
Match the following symbols with their definitions.
1. population
Chapter 18 Analysis of Quiz Results: Spring 2012
A grower claims that only 13% of the strawberries he grows are unsatisfactory. When a truckload of his
strawberries arrives at a farmers' market, one basket containing approximately 105 strawberries is exam
Chapter 21 Analysis of Quiz Results: Spring 2012
We conducted a hypothesis test for a population parameter p at alpha = 0.05 and we failed to rejected Ho.
If we decided to use alpha = 0.10, how would our conclusion change?
A. At alpha = 0.10, we would sti
1.
Whichofthefollowingisnotanassumptionor
conditionthatneedstobecheckedforapairedt
interval?
A. IndependentGroups
B. Randomization
C. NearlyNormalCondition
D. 10%Condition
E. PairedData
PointsEarned: 1/1
YourResponse: A
2. Iftheindividualsselectedforasamp