Is the mean age at which American children can first read now under four years? If the population of all American children has mean age of μ years until they begin to read and standard deviation σ years, one would test which of the following null and alternative hypotheses to research this? A. H0: μ = 4 and Ha: μ ≠ 4 B. H0: μ = 4 and Ha: μ 4 C. H0: μ = 4 and Ha: μ

Question

Is the mean age at which American children can first read now under four years? If the population of all American children has mean age of μ years until they begin to read and standard deviation σ years, one would test which of the following null and alternative hypotheses to research this?
A.	H0: μ = 4 and Ha: μ ≠ 4
B.	H0: μ = 4 and Ha: μ > 4
C.	H0: μ = 4 and Ha: μ < 4
D.	H0: μ = 4 and Ha: μ = 4 ±  , assuming our sample size is n

konradzuse · Answer

@CliffSedge  @jim_thompson5910 I'm assuming C?

jim_thompson5910 · Answer

The null always has an equal sign in it (like these choices suggest)

the alternative is what you want to test

konradzuse · Answer

That's why I assumed it's C since they said ages under 4 years old, and it shows mu < 4?

jim_thompson5910 · Answer

you got it

jim_thompson5910 · Answer

oh just seeing your answer above...lol my bad

konradzuse · Answer

MUWAHHAHAHAHAH!

konradzuse · Answer

2 moar Q's!