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pgs 770-798

# pgs 770-798 - 1 CH 7 Hypothesis Testing With a Single...

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1. CH 7: Hypothesis Testing With a Single Sample [ pgs 770 – 798]      a. A hypothesis as a statement of your expectations: i. The case of the null hypothesis 1. Statistics is more interested in the null hyp than just the hyp 2. Null hyp     a. Is a statements of no difference or statement of equality i. Statement of no relationship b. Statement of chance c. What is a null hyp, & how might it be expressed? i. A null hyp is the hyp that is tested ii. It can be a 1. statement of no diff 2. statement of chance 3. or a statement of no relationship 3. frequency is all we know in chance  4. normal curve a. another statement of chance b. probabilistic distribution  i. a statement of prob. Associated with various portions of the curve c. think about Z scores i. ex: -2.01 1. already know is extremely low Z score a. and therefore a low prob ii. remember 1. Z values of + 1.96 and -1.96 enclose 95% of the area under  the normal curve 2. Therefore only 5% of the area under the norm curve falls  outside those values 3. Only 5 times out of 100 would you expect to get a z value of  more than +1.96 or less than -1.96 4. The extreme 5% would actually be split between the two tails of  the dist 2.5% in each tail 5. Since Z value of – 2.01 is beyond the -1.96 you known that the  prob of Z score is fairly rare – less than 2.5 out of 100 5. What is an extreme score or value?

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