# Posts by PsyDAG

Total # Posts: 23,386

Math
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. Received placebo (1-.80) = .20 Showed improvement (1-.62) = .38

maths geometry (?)
No angle shown. Cannot copy and paste here.

Math
How can you "toss three coins and get one head and one tail"?

math
Cannot graph here. I will use substitution. l = k + 150 l + k = 900 Substitute k+150 for l in the second equation and solve for k. Insert that value into the first equation to solve for l. Check by putting both values into the second equation.

Math
V (round) = π(r^2)h V Rectangular = 6*9*2 A (round-bottom) = 2πrh + πr^2 A (rect.-bottom) = 6*9 + 2*2*9 + 2*2*6

Spanish
1. right 2. wrong 3. right 4. wrong 5. right 6. wrong 7. DK 8. DK 9. right

Math
V = π(r^2)h *3 = ?

math
To compare more easily, change to decimals. 1/4, 1/3, 2/3, 5/7 = .25, .33, .67, .71

math (?)
What is the original distribution?

math for IT(?)
Need data. What is the distribution?

Math (Anon.)
First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked. Second, there are no figures. You cannot copy and paste here.

Math
S = E 2S = 2E = E - 4 + 40

Math(?)
No table. Cannot copy and paste here.

statistics
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.18) and its Z score. Z = (score-mean)/SD

biology

math
W = 450 - C 280C + 125W = 102,750 Substitute 450-C for W in the second equation and solve for C.

math
J = 200/B J-5 = 3B - 4 Substitute 200/B for J in the second equation and solve for B. Insert that value into the first equation to solve for J. Check by putting both values into the second equation.

Which offender? What career?

Biology
The sweat loses salt along with fluid, so the person should take water along with the salt tablet.

math
Median = 50th percentile, middle score in value Mean = ∑x/n = sum of scores/number of scores

algebra 2b
99% = mean ± Z SEm SEm = SD/√n

math (?)
How are "pints" awarded?

math
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.

Stat
X^2 = ∑ (O-E)^2/E, where O = observed frequency and E = expected frequency. ∑ = sum of all the cells. E = (column total * row total)/grand total df = n - 1, where n = number of cells Look up value in X^2 table in the back of your textbook.

Do you have any long term goals that might fit either one? Journalism will enhance your writing skills, and Creative Photography should enhance you artistic abilities. Which is more important to you?

Biology

science
You can use anything that is used for insulation.

Statistics
220/(220+370) = ?

Math
It would help if you proofread your questions before you posted them. How many? Assuming the brick is square, 12 inches = 1 foot, so brick is 1 foot square. 13 * 7 = ? sq ft

English
Learning indigenous languages allows for better communication and indicates empathy for those peoples and their traditions.

English
agree.

intense or irrational dislike or fear of people from other countries. You can Google for definitions.

Maths
March-November = 9 months 162/9 = ? ? * 5 = Allowance

why dont u tell me
What is the hardest subject for anyone is the one that is most difficult to understand. It will vary from person to person. What is your hardest subject?

English
What is the status of married women in a traditional African marriage? What may they do and may not do?

Maths (?)
Lacking data. Perimeter = 2 Length + 2 Width

Math
perimeter = 2 Length + 2 Width

Math(?)
Don't understand your a and b.

math (?)
It would help if you proofread your questions before you posted them. "7 and than 13"?

Statistics Homework (?)

Math
Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown. I agree with C, but how is that different from D?

Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√n If only one SD is provided, you can use just that to determine SEdiff. Find table in the back of your statistics text labeled something like "...

Math
1) 350/(6 1/3) = ? 2) (1-4/9)500 = ?

Statistics Homework
As indicated previously, if something happened 6 out of 20 times would you call that common?

Geometry
Which numbers indicate the sides (lateral area)?

math
1. wrong 2. wrong 3. wrong 4. Wrong, see definition of coefficient 5. wrong 6. wrong 7. Wrong, When multiplying/dividing, exponents are added/subtracted respectively. 8. Wrong Go back to your text book and read your lessons.

Math
Welcome

Math
All numbers are either odd or even.

Safety & Emergencies
Agree

Life orientation
What will you choose?

inertia

Math probibility
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 11/23 * (11-1)/(23-1) = ?

math (?)

Math
Week = 7 days Month = approximately 30 days.

Math
No

psychology
Do not explain study to physicians and nurses. Have a third party, who does not know the hypothesis, record interactions.

math
16 = 4S S = 4 16+x = 2(4+x) Solve for x.

Math (?)
What Chart? Cannot copy and paste here.

chemistry needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.

Math
10^3 for digits (26-5)for first letter 26 for second letter If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

science
You're right that you're right.

science

math
Didn't you indicate the percentage increased by 60%?

math
950%

Math algebra
4x^2(2x+x^3y)+x^y = 8x^3 + (4x^5)y + x^y When multiplying/dividing, exponents are added/subtracted respectively. Anything to the zero power = 1 4x^5 * zero = zero So you are left with 8x^3 +1 = ?

Math
21 * .8125 = 17.0625 Right

math
1 59/100 or 159/100

math
1 3/10 or 13/10

Spanish
First two are right, but I cannot comment on the last two.

Pre- Algebra
Yes.

Pre- Algebra
Disagree with Gucci's answer. .3 * 60 = ?

Consult your school counselor, who can assess your abilities and interest to suggest possible careers for you.

Consult your school counselor, who can assess your abilities and interests to suggest possible careers for you.

Maths (?)
How is this math? What is your context?

Riddle
We might be able to solve it, if it was in English.

stats
I don't know how you did it in class. Z = (score-mean)/SEm SEm = SD/√n Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability for the Z score. How does it compare to your ...

Science
With multiple choice, treat each alternative as a T-F question. If you don't know right answer, before guessing, eliminate wrong alternatives. This increases the chances of your guess being correct. Chemical change.

health
Although all are true, I would pick tissues.

math

MATH
12 * 12 = 144 inches on each side. 144/9 = 16 (16*3)+2 = ?

Spanish
Right, but it requires a following verb.

Math
D = 3S (42+10) + S+10 + D+10 = 100 Substitute 3S for D in the second equation and solve for S. Insert that value into the first equation to solve for D. Check by putting both values into the second equation.

Math
I don't know about "free calculators" mean, but all you need to do is insert various values for x and calculate the y value that matches. e.g., y = 8-8 = 0

Statistics Range, Variance, and Standard Deviation
Range = highest value - lowest Find the mean = sum of scores/number of scores Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance. Standard deviation = square root of variance ...

Statistics Homework
Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√n If only one SD is provided, you can use just that to determine SEdiff. Find table in the back of your statistics text labeled something like "...

Statistics
From the sample, with only 6 of 20 earning the degree in 4 years, it does not seem "common."

science
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. See previous post.

Alegebra
When multiplying/dividing, exponents are added/subtracted respectively. 5^12 5x^2 + 6x - 2

science
The force was not great enough?

science
It would help if you proofread your questions before you posted them. How much did it increase per year? Remember, there are 3 years of interest.

math
10z - 4 + 8z - 8 = 18z - 12

Science
An independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable. A dependent variable is the response or measure of results.

Science

math (?)
What items? You cannot copy and paste here.

Math
-3 - 2 + 9 = ?

Math (?)
What size tiles?

ICT(?)
Lacking data.

ICT (?)
Lacking data.

life orientation (?)