# Recent content by moutazgendia

1. ### TS-pooled or TS-unpooled?

@staassis unfortunately I don't know levene's test, I will google it and see if I can figure it out. @GretaGarbo The standard deviations are not the same, but I can't really tell if they are similar. is there a rule for it? or agreed upon approximation?
2. ### TS-pooled or TS-unpooled?

@hlsmith I mean should I use the formulas for the pooled or un-pooled test statistics (ex. pooled standard error or the un-pooled standard error) ?
3. ### Need help reading the code please to calculate the least squares regression

So it should be y= 3.245 - 0.342X ?

@hlsmith Yes
5. ### TS-pooled or TS-unpooled?

Should I used the TS-pooled or TS-unpooled to calculate the below question; Two competing coffee shops wanted to know how satisfied their customers were with their drink choices (on a scale of 1 to 7, where 1 is very unsatisfied and 7 is very satisfied). They’re assuming that there is some...
6. ### Conditional probability- need to know how to identify the P(A and B) please

Yes thank you so much. I understand now :) appreciate it @obh
7. ### Conditional probability- need to know how to identify the P(A and B) please

Shouldn't it be the intersection of P(A and B )/ P(A)?
8. ### Conditional probability- need to know how to identify the P(A and B) please

@obh Odd enough when I tried he below it gave me a right answer; P(A and B) = P(X =10) = 0.05 P(B)= P(X = 0.24+0.14+0.11+0.05) = 0.54 0.5/0.54 = 0.09259 ~ 0.09 It doesn't make sense from the formula since I assumed the intersection is just the P(X =10), what am I missing
9. ### Conditional probability- need to know how to identify the P(A and B) please

@obh so it should be like this: P(A and B)= P(X=7)= 0.24 P(B)= P(X= 7+8+9+10) = 0.24+ 0.14+0.11+0.05 = 0.54 P(A|B) = 0.24/ 0.54 = 0.444 I tried that and still showed wrong answer
10. ### Conditional probability- need to know how to identify the P(A and B) please

Thank @obh for your reply. I am fairly new to statistics so excuse my naivety; to make sure I understand you right. P(A|B) would be = P(A and B)/ P(B) = P(X= commutative 7) / (P(X= commutative 10) = 0.7/ 1 ? I think I am still not getting it.
11. ### Need help reading the code please to calculate the least squares regression

I would write; b0= 3.24521 age= 0.03453 y= 3.24521 + 0.0345X is that right?
12. ### Need help reading the code please to calculate the least squares regression

Hello I am new to statistics and I am not familiar with the R lab. I was trying to solve to calculate the least squares regression and I am not able to understand the code below. Can you help me please Construct the least squares regression line based in the following output: Call: lm(formula...
13. ### Conditional probability- need to know how to identify the P(A and B) please

Use the following information to determine your answers: A psychology experiment on memory was conducted which required participants to recall anywhere from 1 to 10 pieces of information. Based on many results, the (partial) probability distribution below was determined for the discrete random...