8a_Hypothesis_Testing_Outline

8a_Hypothesis_Testing_Outline - 1 3 Glasses and IQ Are...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Glasses and IQ Are people who wear glasses more intelligent than normal? Glasses and IQ Measure the IQ of 1 randomly selected person who wears glasses. Glasses and IQ Problems? • Larger sample should be more accurate Glasses and IQ Problems? • The person might simply be normal – Normal people can have an IQ that high Glasses and IQ 1 2 3 4 5 6
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
In fact, the probability of randomly choosing a normal person with an IQ above 111 is .2451 Glasses and IQ Again, with n = 30 But, those 30 people might still just be normal and they could have a mean IQ of 109 Glasses and IQ Again, with n = 30 In fact, the probability of a randomly drawn group of 30 having an IQ above 108 is .0031 Glasses and IQ The fundamental problem: There’s always some chance that our sample looks different from the regular population but it really isn’t Because you can still draw individuals and groups from the regular population and find means that are different from the population mean ( sampling error ) Glasses and IQ So we can never be 100% sure that people who wear glasses are smarter than average 7 8 9 10
Background image of page 2
BUT When the probability of getting our sample mean from the regular population by chance is low, we can be fairly
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

8a_Hypothesis_Testing_Outline - 1 3 Glasses and IQ Are...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online