Question

what is a null hypothesis and an alternative hypothesis?

Answer 1

.... terrible example

Answer 2

A hypothesis is a guess at some fact. The null and alternative hypotheses are two competing and opposite hypotheses that cover all possibilities

For example, you could make a guess that the mean height of a plant is 10 inches

Your null hypothesis would be

Ho: mu = 10

The alternative hypothesis would be "the average plant height is NOT 10 inches", so the alternative hypothesis in symbolic form is

Ha: mu =/= 10 (mu doesn't equal 10)

Answer 3

ok so does the null hypothesis mean its purely by chance? that for example the cat took the apple ... but the null hypothesis says theres a chance that it didnt?

Answer 4

yes the core idea with stats is all based on probability

if we assume the null is true, and we have evidence to back it up, there's still a chance we got the wrong hypothesis

Answer 5

that's what type I and type II errors are all about

Answer 6

most likely though, you'll form hypothesis that have numbers attached to them somehow

Answer 7

a null hypothesis of "the cat took the apple" is a bit vague and hard to attach numbers to it

Answer 8

ok so another example the old woman is 45 is the hypothesis so then would she may not be 47 be the null ?

Answer 9

if you make a guess that she's 45, then your null would be

Ho: x = 45

where x is her age

The alternative is

Ha: x =/= 45

Answer 10

Basically, she's either 45 or she isn't 45

Answer 11

ohhh hmm ok if i have another question about it will u come back to this question?

Answer 12

sure

Answer 13

ty

Answer 14

yw