Friday
December 19, 2014

Posts by PsyDAG


Total # Posts: 18,868

statistics
µ = 30 Variance for distribution of means = (SD/√n)^2 = ?
February 20, 2014

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 your later post.
February 20, 2014

math
I assume you mean 3/8 = 7/(x+1). Multiply both sides by x+1. 3/8x + 3/8 = 7 Subtract 3/8 from both sides. 3/8x = 6 5/8 = 53/8 Multiply both sides by 8/3. x = 53/8 * 8/3 = ?
February 20, 2014

Probability
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 1. .2 * (1-.3) = ? Either-or probabilities are found by adding the individual probabilities. 2. (.2 *3.) + (.8 *.3) = ?
February 20, 2014

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 your last post.
February 20, 2014

Science
I agree.
February 20, 2014

algebra
Ah, better! l2xl > 16 x > ± 8
February 20, 2014

algebra
It would help if you proofread your questions before you posted them. There is no inequality given. An inequality requires either a < or > symbol.
February 20, 2014

maths
It would help if you proofread your questions before you posted them. Hard to know if the space denotes a comma or period or something else. 55,010 - 899 = 54, 111
February 20, 2014

STATS
To make a prediction, it doesn't matter which variable is measured on the abscissa.
February 20, 2014

Biology
Is SW USA a polar Region? I live in the SW… A.
February 20, 2014

BIOLOGY
Availability of food and vulnerability to predators. Natural mutations might make changes in phenotypes that help in dealing with the two factors above. Those would then tend to reproduce.
February 19, 2014

Middle School Math Help Please
Juice started out as a whole glass (1). Water = 1/6 + 1/3 + 1/2 = ?
February 19, 2014

Algebra
w = 30 - y 9.95w + 13.50y = 337.55 Substitute 30-y for w in second equation and solve for y. Insert that value into the first equation and solve for w. Check by inserting both values into the second equation.
February 19, 2014

Math
Subtract one equation from the other to eliminate the y. 11x = -11 Solve for x then y.
February 19, 2014

algebra
I don't understand why 100x is negative. Wouldn't commission for sales be positive? If he sells no computers, x = 0.
February 19, 2014

Statistics
See previous post.
February 19, 2014

Statistics
If you are comparing two means, you need to have the SEm, which requires knowledge of n. You do not supply that value. 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 ...
February 19, 2014

Science
Since this is not my area of expertise, I searched Google under the key words "thymus size fetal pig" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=thymus+size+fetal+pig&ie=UTF-8&oe=UTF-8 In the future, you can find the ...
February 19, 2014

Socials
Since this is not my area of expertise, I searched Google under the key words "Kamloops biome" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=Kamloops+biome&ie=UTF-8&oe=UTF-8 In the future, you can find the information you desire ...
February 18, 2014

Math
each set? With replacement, the probability for red remains 6/15 = 2/5 If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
February 18, 2014

Statistics
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. .8 * (1-.6) = .32
February 18, 2014

Statistics (?)
More data is needed for us to provide help.
February 18, 2014

stastistics
http://en.wikipedia.org/wiki/Student's_t-test
February 18, 2014

algebra (?)
No answers followed. Cannot copy and paste here.
February 18, 2014

statistics
Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score. If the events are independent, the probability of both/all events occurring is ...
February 18, 2014

statistics
Expect the µ's to stay the same. The standard error of the mean (SEm) = SD/√n SEm would tend to get smaller as n increases.
February 18, 2014

Algebra 1
f = 2s + 6 s + f = 24 Substitute 2s+6 for s in second equation and solve for s. Insert that value into the first equation and solve for f. Check by inserting both values into the second equation.
February 17, 2014

Math
We cannot draw on these posts.
February 17, 2014

Chemistry needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.
February 17, 2014

science
Also, please do not use all caps. Not only is it harder to read, but it is like SHOUTING online. Thank you.
February 17, 2014

Science
I agree.
February 17, 2014

stats (?)
since you cannot copy and paste, we do not have the ANOVA. Even if we did, what is you question?
February 17, 2014

Math
Multiply top equation by 3 and then add the equations. 3x + 6y = 15 -3x + 6y = 15 12y = 30 You can take it from this point.
February 17, 2014

math (second Anon.)
First, if you are a different anonymous and 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, we do not do your homework for you. ...
February 17, 2014

math (first Anon.) (?)
Choices not given. You cannot copy and paste here.
February 17, 2014

math
Since this is not my area of expertise, I searched Google under the key words "business math to evaluate investments" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=business+math+to+evaluate+investments&ie=UTF-8&oe=UTF-8 In the ...
February 17, 2014

biology
Since this is not my area of expertise, I searched Google under the key words "hypertonic" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=hypertonic&ie=UTF-8&oe=UTF-8 In the future, you can find the information you desire more ...
February 17, 2014

biology
See your later post.
February 16, 2014

math (?)
You have two unknowns. Without more data, it cannot be solved.
February 16, 2014

Chemistry needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.
February 16, 2014

maths (?)
Again you are unclear. Are you choosing from the selected cards or the remainder of the deck? If of the 7 cards removed, red card is 2/7. neither king nor queen = 5/7 I'll let you do the rest.
February 16, 2014

maths
I'm not sure what "it" refers to. As long as the choice is random, there are 15 odd cards of the 30. 15/30 = ?
February 16, 2014

Statistics
Sampling with replacement puts the chosen unit back in the pool, while without replacement does not. Probabilities remain the same with replacement, but both numerator and denominator are reduced by one in without replacement in subsequent choices.
February 16, 2014

Math
3s + 4j = 360 s + 3j = 220 Multiply second equation by 3, then subtract first from second. 3s + 9j = 660 5j = 300 Solve for j, then insert that value into either equation to find s.
February 16, 2014

Ethics
Intrinsic goods are valued in themselves rather than leading to some other goods. http://www.diffen.com/difference/Ethics_vs_Morals
February 14, 2014

Math
1.3-2.5x ≤ -1.2x-0.52 Add .52 and 2.5x to both sides. 1.3 + .52 ≤ -1.2x + 2.5x 1.82 ≤ 1.3x Divide both sides by 1.3. 1.4 ≤ x or x ≥ .14
February 14, 2014

Statistics
Why are you substituting 5 for =? Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.025 because it is two-tailed) and its Z score. Insert Z first as ...
February 14, 2014

physics (?) needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question. https://www.google.com/search?client=safari&rls=en&q=appropriate+outlet+box&ie=UTF-8&oe=UTF-8
February 13, 2014

Math 7
Cannot be solved unless you have some indication of relation of A or b to the height (20). A = 10b
February 13, 2014

Math
Change to common denominator (70). 35/70 + 40/70p > 91/70 40/70p > 56/70 p > 56/40
February 13, 2014

math 3 (?)
What is your question?
February 13, 2014

Math
You are more likely to get help, if you included specific problems from that unit.
February 13, 2014

math
Since half of the isosceles would a right triangle, use the Pythagorean theorem with 1/2 value of the base. 4^2 + altitude^2 = 5^2 Solve for the altitude.
February 13, 2014

Statistics
Need to ask questions first to get more details. Was the sample random? Was it large enough? Was the spread statistically significant? Was the way the question was stated biased?
February 13, 2014

Statistics
http://drdavespsychologypage.homestead.com/Odds__Figuring.pdf
February 13, 2014

statistics for managers
We have no knowledge of your departments.
February 12, 2014

Algebra
Let a and B represent the respective hours worked. 10A + 7.5B > 300
February 12, 2014

algebra
10x+25(x+2)+5*5(x+2)= 400 10x + 25x +50 + 25x + 50 = 400 55x = 300 x = 300/55 = 5.45 I found one mistake in you equation above (bold), but that still does come out right. Do you have any typos?
February 12, 2014

english (?)
No following words. Cannot copy and paste.
February 12, 2014

algebra (?)
You need to compete the problem. Cannot copy and paste.
February 12, 2014

SCIENCE (?)
What are your choices? person? free thinker?
February 12, 2014

math
Same process as previous post.
February 11, 2014

math
1/3 * 3/4 = ? Canot draw on these posts.
February 11, 2014

Math
It can also include 8.601, 8.602, etc.
February 11, 2014

Math
Are you talking about 8.611, 8.612, 8.613, etc.?
February 11, 2014

Math (?)
No kite shown. cannot copy and paste.
February 11, 2014

Algebra
(64º - 40º)/8 = ?º
February 11, 2014

Algebra (?)
Problem 1?
February 11, 2014

Math
Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown. a. 2 * -9 = -9 + -9 = -18 d. 7 * 0 = 0 Use process in a to solve b and c.
February 11, 2014

Statistics
Is Z = +1 the same as the mean? That should give you the answer.
February 11, 2014

STATS
Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.025) related to the Z score. Insert Z and other values into above equation.
February 11, 2014

math 3
P(red) = 2/(4+2+6) = ? If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. P(red) * P(red) = ?
February 11, 2014

math (?)
How many hour does she work? If typical, that would be 40.
February 11, 2014

statistics, math, college
Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.02) and its Z score. Insert Z score and other data in above equation and solve.
February 11, 2014

math-fractions
I don't see where you need to use fractions to find the total. 9 + 6 = 15
February 11, 2014

algebra 1
I'm not sure what you are asking. 50 < 3d+5 < 89
February 11, 2014

Behavioral Statistics
Ho: mean = 40,000 H1: mean > 40,000 Z = (score-mean)/SEm SEm = SD/√n Since you are only concerned with greater than 40,000, you will reject Ho if Z falls in the top 5%. Find table in the back of your statistics text labeled something like "areas under normal ...
February 10, 2014

Math
Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown. 5. wrong, 5^-3 = 1/5^3 6 & 7 are right.
February 10, 2014

Math
Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown. I am also not sure what you are asking. 2/3 * 4/5 * m = 1/3 8/15 * m = 1/3 m = 1/3 * 15/8 = 15/24 = 5/8
February 10, 2014

Math
44.14/4 = ?
February 10, 2014

statistics (?)
What is your question?
February 10, 2014

Math
3 3/4 = 15/4 15/4 * 2/3 = ?
February 10, 2014

Science
We have no knowledge about your house or the fungi in it.
February 10, 2014

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. As answered to your later post, we don't know about your house.
February 10, 2014

maths
It would help if you proofread your questions before you posted them. "11/2"?
February 10, 2014

Math (?)
What is your question?
February 10, 2014

math
Here is the process. It doesn't fit with the above answer. m = j + 17 m + j = 49 Substitute j+17 for m in second equation and solve for j. Insert that value into the first equation and solve for m. Check by inserting both values into the second equation.
February 10, 2014

Algebra
a. Best = y = 40 + .10x A+ = y = 35 + .20x b. Calculate y when x = 500. c. 40 + .10x = 35 + .20x Solve for x.
February 10, 2014

Algebra
Substitute the value for x and solve the equation for S. S = 50(14) + 450 = 700 + 450 = 1150 Do the same for the other values.
February 10, 2014

Math
3.3 - 5(.2) = ?
February 10, 2014

STATS
Yes
February 10, 2014

Statistics
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.45) and its Z score. Insert the Z value in your equation and solve for x.
February 10, 2014

Research and Statistics
What does it mean? https://www.google.com/search?client=safari&rls=en&q=truncated+range+statistics&ie=UTF-8&oe=UTF-8
February 10, 2014

statistics
No, since the value is above the mean, it would be less than 50%. Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
February 10, 2014

Statistics (?)
What is question 19? You cannot use copy and paste here.
February 10, 2014

Statistics in Psychology
A correlation coefficient cannot exceed ± 1. From your data, neither would be useful.
February 10, 2014

Statistics in Psychology
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 your previous post.
February 10, 2014

statistics
Z = (score-mean)/SD Solve for Z.
February 10, 2014

Statistics
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question. Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find...
February 10, 2014

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