published conclusions with agrain of salt. Even professional researchers can misuse hypothesistests. “Data mining” (first gathering data, then looking forrelationships) is one problem, but not the only one. See().If you find the article heavy going, just scrolldown to read the example in Box 1 and then the corollaries thatfollow.
Example: In 2001, 9.6% of Fictional County motoristssaid that fuel efficiency was the most important factor in theirchoice of a car. For her statistics project, Amber set out toprove that the percentage has increased since then. She interviewedin a systematic sample of those registering vehicles at the DMV, and13 of them said that fuel efficiency was the most important factor intheir choice of a car. Test her hypothesis, at the 0.05 significancelevel.
Period 6 Batteries Made Out of Coins Problem: How would the amount of coins affect how much electricity produced Hypothesis: The more coins there are the higher the voltage would be.
IV: Amount of coins.
Control: 2 coins Results The stack of 8 coins' first trial had 1.25, second 1.2 and third had 1.28 and the average is 1.07.
Okay, you’re looking to figure out if this sample istoo unlikely, if the null hypothesis H0 is true? But what do youmean by “too unlikely”? Back in Chapter 5, we talkedabout, with athreshold of 5% or 0.05 for such events. We’ll use that idea inhypothesis testing and call it a significance level.
In a classroom exercise, if you were asked to do a hypothesistest you would do a hypothesis test and only a hypothesis test. Butin real life, and in the big labs for class, it makes sense to answerthe obvious question: If the true mean is less than $200.00,what is it?
We’re going to take a seven-step approach tohypothesis tests. The first examples will be for binomial data,testing a claim about a population proportion. Later in this chapteryou’ll use a similar approach with numeric data to test a claimabout a population mean. In later chapters you’ll learn to testother kinds of claims, but all of them will just be variations on thistheme.
- 8 Canadian pennies
- 8 Canadian nickles
- paper towel
- tap water
- volt meter that can read up to 10 volts
- metal table spoon
The point of our experiment was to make a battery out of coins.