Power of a test: probability of making the correct decision when the alternative hypothesis is
Standardized score/z-score: the number of standard deviations a score falls from the mean
(+ve: above mean, -ve: below mean)
A normal curve/distr
13.1 (a) Counts will be obtained from the samples so this is a problem about comparing
proportions. (b) This is an observational study comparing random samples selected from two
13.2 (a) Scores will be ob
15.1 The correlation is r = 0.994, and the least-squares linear regression equation is
y = 3.66 + 1.1969 x , where y = humerus length and x = femur length. The scatterplot with the
regression line below shows a strong, positive, linear rela
1. For each description below, identify each underlined number as a parameter or statistic. Use
appropriate notation to describe each number, e.g., j} = 0.96.
(a) A I993 survey conducted by the Richmond Times-Dispatch one week before election day
Article 1 Plain cigarette packs encourage smokers to quit
This article discusses an experiment that tested the difference between plain cigarette
packs and branded packs. The experiment looked at the impact o
Chapter 12 0 Sample Surveys 2
Population The entire group of individuals or instances about whom we hope to learn.
Sample A (representative) subset of a population, examined in hope of learning about the populatior
Sample survey A study that asks qu
Charlie and Tanya
U.S. aid vs GDP
AP Statistics, Barsoum
35/40 - really interesting research. Some errors which i hope we wont see again! The AP examiners
are picky about language being just right. Start being picky too!
A. Description of experiment:
the game of greed
Rules: Everyone stands. Someone throws a die twice and totals the numbers.
This is everybody's current score.
Those that are happy with that score sit down, they hav
Top Ten Phrases to Memorize for AP Statistics
Underlined words/phrases or blanks indicate context is needed.
regression: interpretation, in context, of
1. r positive or negative, weak or strong linear association between explanatory variable
Name: _ Date:_ Period: _
1. Where on the normal curve are the inflection points located?
Where the slope starts to drop off at.
2. What is the standard normal distribution?
A standard Normal distribution is a Normal curve with a
11.1 (a) fl
mean score for all older students at this college. (b) If f.1 = 115, the sampling
in Normal with mean 115 and standard deviation 30/
J25 = 6
or N( 115, 6).
See the sketch below (on the left). (c) Assuming Ho is true, ob
1.Nile.com, the online bookseller, wants to increase its total revenue.
One strategy is to offer a 10% discount on every book it sells. Nile.com
knows that its customers
can be divided into two distinct groups according
1e: Mean, Median and Standard Deviation
The sample mean of a numerical sample, x1, x2, x3, . . . , xn, denoted x , is
x + x + x + . + xn xi
x= 1 2 3
The population mean is denoted by , is the average of all x values in the entire
1-g IQR and Box Plots
N(min, Q1, med, Q3, max) from the 1-Var Stats display
Useful because it summarizes enough information to approximately describe a
extremesgive bounds for the data setall values fall between them
The Practice of Statistics - Yates, Moore, & McCabe
Chapter 1: Exploring Data
Comparing Two Means
compare the responses in two different groups
each group is considered to be a sample from
a different population
responses of each group are independent of
those in the other group
samples MAY be of different
AP Statistics Chapter 9 Sampling Distributions Study Guide
1. The candy company claims that 10% of the M&Ms it produces are green. Suppose that the candies are
packaged at random in small bags containing about 50 M&Ms. A class of elemen
STAT, CALC menu
1. 1-Var Stats (list).
Calculates mean, summation etc. from the requested list.
2. 2-Var Stats (list1, list2)
Calculates the mean, summation etc. from both lists as well as their combined summation.
Planning a Study: Review and Practice
When travelers change airlines during connecting flights, each airline receives a portion of the fare. Several years
ago, the major airlines used a sample trial period to determine what percen
The entire group of individuals that we want
information about is called the population.
A census is an attempt to gather information about
every individual member of the population.
Problems with censuscosts; time needed to
Chapter 5: Producing Data
Designing Samples (pp. 269-285)
1. What is an observational study? An observational study observes individuals and measures
variables of interest but does not attempt to influence the responses.
2. What is an experiment? An e