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Stats Final - 23:03 Chapter 9 Z values 90 z=1.645 95...

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23:03 Chapter 9  Z values  90% z=1.645  95% z=1.960 99% z=2.576 Type 1 error  Occurs if Ho was rejected when it shouldn’t be  Probability of a type 1 error is the level of significance  Type 2 error  When Ho should have been rejected but wasn’t  Referred to as B risk  3 types of tests  Left tailed  H 0 : u>=u 0   H 1 : u<u 0 Two Tailed  H 0 : u=u 0   H 1 : u u 0 Right tailed  H 0 : u<=u 0   H 1 : u>u 0 Direction of test indicated by H 1 <  Left tailed   Two Tailed  > Right tailed 
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Decision Rule  Left tailed – Reject H if the test statistic is less than left-tail critical value  Two Tailed – Reject H if the test statistic is less than left tail critical value or if the test  statistic is greater than right tail critical value  Right tailed - Reject H if the test statistic is greater than than left-tail critical value  Testing a Proportion 
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