Question

A researcher wants to assess the mean cost of textbooks for one class is greater than $130. Determine which statement is true regarding errors. If a sample evidence leads the researcher to believe that the mean cost is not greater than $130 when, in fact, the mean cost is greater than $130, then type Il error is made. If a sample evidence leads the researcher to believe that the mean cost is greater than $130 when, in fact, the mean cost is not greater than $130, then type Il error is made. If a sample evidence leads the researcher to believe that the mean cost is not greater than $130 when, in fact, the mean cost is greater than $130, then type l error is made. If a sample evidence leads the researcher to believe that the mean cost is greater than $130 when, in fact, the mean cost is greater than $130, then type l error is made.

Answer 1

null e = Here hypothesis is Hoo u=130 mean cost of textbooks for one class and alternative hypothesis is - HO e7130 i.e. Mean cost of textbooks for one clair ir greater than $ 130 Type Error is Reject Ho when Ho is true. Type -I Error is Do not reject Ho when Ho is false. i-e. Do not reject Ho when Ho ir False. + If a sample variance leads the researcher to believe that mean cost is not greater thay $ 130 in fact, the mean cost in than $ 130 then type-I type-1 error ir made. greater