Question

...

Answer 1

So, unfortunately, I am not on the probability side of things, but I'll do my best. I always start by defining any terms I do not know. So, I looked at these.
http://en.wikipedia.org/wiki/Student's_t-test
http://en.wikipedia.org/wiki/Student%27s_t-distribution

Answer 2

http://en.wikipedia.org/wiki/P-value
Then I find an example : http://www.gla.ac.uk/sums/users/jdbmcdonald/PrePost_TTest/pandt1.html

Answer 3

Any help?

Answer 4

k Sorry, I'm more on the theoretical side of the spectrum, but I'll read up and see what I can find.

Answer 5

Also, don't read until you want the answer https://answers.yahoo.com/question/index?qid=20120327101905AAq4Xqs

Answer 6

Hmm, let's check it? What is the formula for t?

Answer 7

Also maybe: https://www.khanacademy.org/math/probability/statistics-inferential/hypothesis-testing/v/t-statistic-confidence-interval

Answer 8

They have a whole section on it

Answer 9

Sorry I'm not much help, I haven't had prob and stats for like 7 years

Answer 10

I would either watch the Mit course or khan to find that

Answer 11

Can also try youtube

Answer 12

sure, there is actually a practice problem on that one site withthat

Answer 13

http://www.gla.ac.uk/sums/users/jdbmcdonald/PrePost_TTest/pandt1.html

Answer 14

which ti are you using?

Answer 15

ok

Answer 16

i'd say 50

Answer 17

well I'd say mu not is the claimed change of score, and that is what we want to show is either true or not true

Answer 18

watch this viideo: https://www.khanacademy.org/math/probability/statistics-inferential/hypothesis-testing/v/hypothesis-testing-and-p-values

Answer 19

it's ok I'm watching it too, this is starting to come back a little

Answer 20

I need to find the p-value. How do I start the t-test? The information is below in the prompt. I really need help.

A company advertises that by using its SAT math prep class, students can increase their score by at least 50 points, A teacher is skeptical of this claim. Suppose μ represents the actual mean increase in math SAT scores of the population who have used the method and assume the distribution of their scores is approximately normal. The teacher collects a data sample of 16 students who took the class to see if the claim is true. The mean increase of scores is 45 points with a standard deviation of 20 points. Is this data enough evidence that the mean improvement is less than 50 points?

H0: μ = 50
H1:Aμ < 50

Answer 21

It is almost correct. You subtract the estimate minus your null hypothesis value...

But you got t = -1 anyway which was correct..

Answer 22

I would have divided 20 by √16 first

Answer 23

t=z i guess, but listen to kirby

Answer 24

Is your significance level just assumed to be 0.05?

Answer 25

I got \[\frac{50-45}{5}=1 ~standard~deiviation away\]

Answer 26

so p is high, and can accept the null

Answer 27

You can use the approximation t = z when you have |"large" values of n (large sample size). Usually it is considered to be "30" but is subjective. Also, you are not given the standard deviation of the population, but just of the sample.

Answer 28

You have to do 45 - 50, not 50 - 45

Answer 29

ah ok

Answer 30

(sample statistic ) - (null hypothesis value)

Answer 31

kirb deserves it, he actually knows the material, no hard feelings

Answer 32

Ya Fibonacci you did a good job even though you are not too familiar with the topic. Kudos

Answer 33

thanks guys, :) Now, I feel the need to find my prob and stats book.... haha but really great job kirb and Blank, you worked it out on your own for the most part, so major kudos

Answer 34

:)