inference about a populations MEAN or comparing two populations MEANS 1 and 2
Population standard deviation is known
Population standard deviation is unknown
1-sample z-test or z-interval
1-sample t-test or t-interval [df = n1]
1. Is the sample
Calculator Exercise to help you understand ways to increase POWER Warning, the calculator can be a bit of
a black box sometimes. This exercise is not a substitute for doing some hard thinking about power on your
Lets say you are trying to conduct inf
Case Closed 14
1. Step 1: Populations: All healthy women undergoing treatment with in vitro
fertilization or intracytoplasmic sperm injection, and all healthy women
who did not.
Parameters: The proportions of women in each population who
Case Closed 14 Does acupuncture promote pregnancy?
1. Populations: All healthy women undergoing IVF or ICSI who receive acupuncture, and all those who do
Parameters: The distribution (proportions) of women in each population who successfully conceive
9.3 Sampling Distribution for Sample Means (Distribution of
) Central Limit Theorem
Our goal in this section is to understand the center, spread, and shape of the sampling distribution of . In
this demo, we will assume that we already understand the cente
Fathom Demo 9.2 Sampling Distribution of the Sample Proportion Pass the Pigs
Rolling a plastic pig is kind of like rolling a die, in that the pig can land in one of six positions.
The pig is unlike the die in that the six positions are not equally likely.
9.2 Sample Proportions
You flipped a thumb tack n = 5 times and calculated the sample proportion of times it landed points up. In this example
it landed point up 3 out of 5 times for a of 0.6.
Sample of Tack
Use the following information for # 1-3.
Let the random variable X be a random number with the uniform density curve given below.
Referring to the information above, P(X = 0.25) is
By writing my name on this test, I agree to be
bound by Kent Schools statement on Academic
Integrity, which Ive already signed. THIS IS
AND WILL REMAIN MY OWN WORK.
AP Statistics Chapter 7 Test
Part I. Multiple Choice. In the space provided, write
1. You are studying alligators in central Florida, and have gathered the following data
on the lengths (in inches) and weights (in pounds) of several alligators captured
there. Because it is easy to estimate the length of an alligator from a boat or plane
Case Closed 10 Need help? Give us a call!
The mean response time is 31.99 seconds and the standard deviation is 37.13 seconds. But it is obvious that
the high outliers and extreme right skewness will impact these statistics. The median response time is
Case Closed 8 Psychic probability.
(a) The proportion of successes for all trials is 88/288 = 0.306.
For high-confidence trials, it is 55/165 = 0.333.
For medium-confidence trials, it is 12/48 = 0.25.
For low-confidence trials, it is 21/75 = 0.28.
If we a
People who died for myocardial infarction by sex and age group
40 to 50 years
50 to 60 years
60 to 70 years
70 to 80 years
Special Problem 3
In October 2001, National Geographic discovered a huge crocodile-like animal,
dubbed SuperCroc. I am going to predict the body length of the SuperCroc through
analysis of gharials which are relatives of SuperCroc. I will us
Special Problem 2
This statics is used for a vending machine company to make a recommendation
on the mean number of ounces of beverage that their machines should be programmed
to dispense. The definition of over-filling and under-filling, st
Special Problem 1: 2004-05 college tuition
As we all know, college tuition is always rising higher and higher. The cost of college
tuition is rising far more than inflation in some points. This data is going to show you that the
tuition of 12 well-regarde
Case Closed 5
1. Study I
a. Study I is an experiment because a treatment had been provided
which is to consume chocolate by pregnant women.
b. No, it is not justified because the pollsters did not provide their design
of the experiment. We cannot know if
Case Closed 4 Its a matter of life and death
This graph shows the residuals from a linear model for log(premium) and log(age).
Those are the transformations wed make in order to pursue a power model for the original data of
premium and age. On the x-a
Case Closed 3 Are baseballs juiced?
1. The above scatterplot shows that for the first ten years, the average number of hone runs per game
had a decreasing trend, then leveled off, be
Case Closed 2 The New SAT
First, some general notes on trends that I noticed in your papers.
Get out of the habit now of writing out your calculator lingo. No one but you and I know what invnorm or
normCdf mean. The AP Readers hate this.
When you ar
Case Closed 1 Nielsen Ratings
1. Graphical summaries:
See plot of Nielsen ratings for shows on each network below. I chose to make my first graph in Fathom, but
you could have used your TI Emulator, your tablet pen, or even a stemplot typed