Question

Suppose the SAT scores for reading vary normally with a mean µ= 475 and a standard deviation of 100. Ten thousand students go through a training program to improve their score. The average SAT scores for the students are found to be larger than 475 and statistically significant with a p-value of 0.0028. Which of the following can be concluded?

Answer 1

We cannot say if the score improved at all.

The average score is improved by training by at least 100 points

The score must have been improved by a large number to produce such a small p-value.

We cannot say by exactly how much the SAT reading score is improved, only that the observed improvement is unlikely to have arisen by chance.

We cannot say by exactly how much the average score is raised.

Answer 2

What is the p value and what does it mean?

Answer 3

The problem tells us that the students who had the training improved their scores by a statistically significant amount. Without knowing what the p value is and what it means I'm afraid that is about as far as I can go. I see by your silence that you also do not know what it is. I think that might be a good starting point for you to investigate so that you can answer the question.

Answer 4

the p is .0028......

Answer 5

Aha. i was right. You don't know what the significance of the p value is. What does it tell you? What does it mean if it is large. Is it more significant if it is large or small? This is the sort of thing, I suspect, you are supposed to be learning. i could look that up, learn it and tell you. But then again you could do that for yourself.

Answer 6

or a

Answer 7

Have I not been clear?

Answer 8

1. I have only a minimal knowledge of rudimentary statistics
2. I do not know what p value is
3. I do not know if the given p value means anything or if it is to small to be meaningful
4. Consequently I do not know the answer to your question.
5. I do not know.
6. The answer is unknown to me.

Answer 9

um ok

Answer 10

@Eyad

Answer 11

So you have a few options:
1. Get someone else to answer the question for you
2. Look up p value & learn what it means & then answer the question
3. Just blow this one off and figure it won't hurt your score too much
4. Ask your teacher to explain it to you.

Answer 12

@Eyad

Answer 13

i got C...

Answer 14

?

Answer 15

?

Answer 16

Sorry Schmidt, i Tried to solve it (research+basics rules ) But I failed :/
Anyway ,I will ask a friend who is proficient in rudimentary statistics when he gets online :)

Answer 17

i have to finsi now, so ill just go with c..

Answer 18

@amistre64 ?

Answer 19

i think of a P-value as relating to a probability. And that if the P-value is less than .05, then there is a high probability that this result could not have happened by chance.