8.1 style
1. An economist wants to estimate the mean income for the first year of work for college graduates.
a) A sample of 400 first year college graduates showed an average income of $16,000. Construct a
90% confidence interval for the true population
In-Class Review for 9.1-10.1
(9.1 style)
A production line fills bags of dry dog food. The population mean is supposed to be 30lbs. It is known
that the population standard deviation of bag weight is 0.22 lbs. A sample of 12 bags is occasionally
taken to
Stats 190 Review for 8.1-9.1
8.1 style _ - __
1. An economist wants to estimate the mean income for the rst year of work for college graduates.
a) A sample of 400 rst year college graduates showed an average income of $16,000. Construct a
90% condence i
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In-Class Review for Final
* Note: This review is merely a smattering of old topics. There are many topics not mentioned here, *
for which you are still responsible on the cumulative final exam.
1) Variation (3.2)
Martha and Tim each observed 10 of a certa
Math/Busn 190 - Exam 3 Review
Chapter 8
8.1
Estimating when is known: What is a confidence interval? How do you find zc? What is a margin of error? How do you
find a confidence interval, which formula for E do you use? Can you write the sentence explainin
Counting Review
A traveling saleman wishes to
visit 4 cities: A, B, C, D (& any
2 are connected)
how many ways could he plan
his trip?
4! = 4321 = 24 ways
What if he if he had 40 cities?
40!=
815,915,280,000,000,000,000
,000,000,000,000,000,000,000
,000,0
Chapter 5
Probability
Gaining the Tools
and Vocabulary
Needed for the Rest
Where Are We?
Ch 1 Collection of data
Ch 2 Presentation of data
Ch 3 Measuring data (center; spread)
Ch 5 LAWS OF PROBABILITY
Ch 8-11 Look at data from a sample; Use the laws
of pr
3.1
Average Measure of Central
Tendency
Mode- Most frequently occurring
data value
Median The middle value in an
ordered array of data values
Mean Add up all values, and
divide by number of values
Mode Most Frequently
Occurring Value in a Set of Data
If t
Statistics the science dealing with the
collection, analysis, interpretation and
presentation of numerical data
Chapter 1
Collection
Chapter 2
Presentation
Chapter 3
In most studies, well have:
Individuals- the people or
objects included in the
study
D