# Null and Alternative Hypotheses Flashcards

you are measuring the difference between a sample average and the average of a standardized population; your computed t is 1.56 and your critical t from Appendix B is 2.56

what is your null? do you accept or reject it?

Ho: sample mean = population mean

accept the null because the computed t is less than the critical t

you are measuring the difference between the average of a group that is independent than that of another group’s average; your computed t is 2.064 and your critical t from Appendix B is also 2.064

what is your null? do you accept or reject it?

Ho: independent sample mean = other independent sample mean

reject the null because the computed t is equal compared to the critical t

you are measuring the difference between a group of students’ test a score and their test b score (which was administered six months after test a); your computed t is 4.74 and your critical t from Appendix B is 2.16

what is your alternative hypothesis? do you accept or reject it?

Ha1: mean test a score

the smaller the t….

the greater the uncertainty

What do you need to know to enter Appendix B?

degrees of freedom (df)

one tailed or two tailed test?

alpha level

2 tailed

no prior research, cannot assume 1 alternative is illogical or impossible to achieve

1 tailed

pilot of other research demmonstrates that 1 alternative is impossible or illogical