Professor Doofus had his students rate him as Excellent, Good, Fair or Poor.He wants to find out if there is a difference in the test scores of students in these four groups.Which hypothesis test should be used for the hypothesis that students who ranked him as Excellent had higher test scores?

decision rule

z test

paired t test

ANOVA test

the chi-square test

the alpha test

funky fresh test

Researchers analyzed the effectiveness of a smoking cessation hypnotism program for 10 smokers.Their daily cigarette numbers were measured before and after the hypnotism.Which distribution should be used to test the hypothesis that the hypnotism program worked?

decision rule

the z distribution

the t distribution

the F distribution

the chi-square distribution

the alpha distribution

p-value distribution

Researchers analyzed the effectiveness of the Fatkins diet for 10 dieters.Their body weights were measured before and after the diet.Which distribution should be used to test the hypothesis that the diet worked?

decision rule

the z distribution

the t distribution

the F distribution

the chi-square distribution

the alpha distribution

p-value distribution

The mean gross annual incomes of the population of certified tack welders are normally distributed with the mean of $20,000 and a standard deviation of $5,000.The ship building association wishes to find out whether their tack welders earn $20,000 annually or not.A sample of 81 ship building tack welders revealed a sample mean of $21,111.What is the alternate hypothesis?

H0: m = 20,000

H0: m 20,000

H0: m = 21,111

H1: m = 20,000

H1: m 20,000

H1: m 21,111

The mean gross annual incomes of the population of certified tack welders are normally distributed with the mean of $20,000 and a standard deviation of $5,000.The ship building association wishes to find out whether their tack welders earn $20,000 annually or not.A sample of 81 ship building tack welders revealed a sample mean of $21,111.What is the null hypothesis?

H0: m = 20,000

H0: m 20,000

H0: m = 21,111

H1: m = 20,000

H1: m 20,000

H1: m 21,111