Question

Stats question. Need help confirming answer.

Answer 1

what is it

Answer 2

A personnel manager of a large insurance company wishes to evaluate the effectiveness of four different sales-training programs designed for new employees. A group of 36 recently hired college graduates are randomly assigned to the four programs with 9 employees in each program. At the end of the month long training program, a standard text is administered to the 36 employees. The scores were: Program A had a mean of 81 and a standard deviation of 10; Program B had a mean of 68 and a standard deviation of 9; Program C had a mean of 77 and a standard deviation of 9; Program D had a mean of 84 and a standard deviation of 7. What are your hypotheses? Which groups are statistically significant from which groups?
Hypothesis: These 4 groups are all statistically about equivalent. h0=ProgramA=ProgramB=ProgramC=ProgramD
h1=One of them is not equal
95% confidence interval:
ProgramA=64.816>=x>=92.184
ProgramB=61.082>=x>=74.918
ProgramC=70.082>=x>=83.918
ProgramD=77.851>=x>=90.149
Hypothesis is correct they are all statistically significant to each other.

Answer 3

@dumbcow

Answer 4

what is your h0?

Answer 5

that all the means are the same

Answer 6

i see

Answer 7

Yes, h0=means are the same.

Answer 8

and you set up confidence intervals ,

Answer 9

you used t scores for the interval

Answer 10

Yes, 95%.

Answer 11

Yes.

Answer 12

ok checking

Answer 13

I got for A
73.313 < x < 88.687

Answer 14

using t score

Answer 15

I used my TI 84 calculator

Stat -> Tests -> 8: T Interval

Answer 16

So, I got it wrong. :-(

Answer 17

Well, I don't have a graphing calc on me. So, I'll assume your answer's correct. Could you help me by pointing to me to the formula? By any chance?

Answer 18

At the end of the month long training program, a standard text is administered to the 36 employees. The scores were: Program A had a mean of 81 and a standard deviation of 10; Program B had a mean of 68 and a standard deviation of 9; Program C had a mean of 77 and a standard deviation of 9; Program D had a mean of 84 and a standard deviation of 7. What are your hypotheses? Which groups are statistically significant from which groups?



ProgramA=73.313<=x<=88.687
ProgramB=61.082<=x<=74.918 this is correct
ProgramC=70.082<=x<=83.918 this is correct
ProgramD 78.619 <= x <= 89.381

Answer 19

hmm... Wonder what I did right for those and what I did wrong for the others.
Anyways, I'll go back and redo them all. Thanks a bunch.

Answer 20

thats weird you got two correct and two incorrect

Answer 21

how do we answer this question
"Which groups are statistically significant from which groups?"