Chap 8 HW.docx - 8-21 Rude o Mean= 8.511 S= 3.992 o Mean= 11.81 s= 7.38 Control Let 1= mean performance of students in the rudeness group let 2= mean

# Chap 8 HW.docx - 8-21 Rude o Mean= 8.511 S= 3.992 o Mean=...

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8-21: Rude: o Mean= 8.511; S= 3.992 Control: o Mean= 11.81; s= 7.38 Let µ1= mean performance of students in the rudeness group; let µ2= mean performance of students in the control group H0: µ1- µ2= 0; Ha: µ1- µ2< 0 -2.81< -2.33, reject the null hypothesis o There is sufficient evidence that the mean performance for students in the rudeness condition is less than the mean performance of students in the control group 8-23: Honey: o Mean= 10.714; S= 2.855 DM: o Mean= 8.333; s=3.256 Let µ1= mean improvement in total cough symptoms using honey; let µ2= mean improvement in total cough symptoms using DM H0: µ1- µ2= 0; Ha: µ1- µ2> 0 3.20> 1.645, reject the null hypothesis o There is sufficient evidence that honey may be the better treatment for coughing and sleep difficulty when children are sick 8-65: N1=n2=(( α  ^2 (α1^2+ α2^2))/ (ME)^2= (1.96)^2 (9^2+9^2)/ 2^2= 155.6=

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• Spring '08
• Deshmikh
• Null hypothesis, Statistical hypothesis testing, total cough symptoms, mean performance

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