Saturday
December 20, 2014

Posts by PsyDAG


Total # Posts: 18,873

Chemistry needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question. We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We ...
October 19, 2014

statistics
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 "...
October 19, 2014

statistics
Since mean, mode and median have the same value in a normal distribution, 50%.
October 19, 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.
October 19, 2014

Algebra
(.50*.40)f = 500 Solve for f.
October 18, 2014

STATISTICS
Please do not use all caps. Not only is it harder to read, but it is like SHOUTING online. Thank you. Z = (score-mean)/SD Calculate without the six zeros to indicate millions to make it easier. Find table in the back of your statistics text labeled something like "areas ...
October 18, 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.
October 17, 2014

math
√36 = 6 Does that look irrational?
October 17, 2014

Math
Disagree.
October 17, 2014

Math
Yes.
October 17, 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. Multiply by 100. Percentile rank is % ≤ any score.
October 17, 2014

health/stats
How are you measuring cholesterol? In one person over time? Population averages? It can approximate a normal distribution, but very unlikely to "exactly" match.
October 17, 2014

science help
Agree.
October 16, 2014

Math
Add 2 to both sides, then multiply by 2.
October 16, 2014

Sociology
Consider that the President of the United States earns less in office than many company executives.
October 16, 2014

Life orientation
How far in the past are you using for comparison?
October 16, 2014

Statistics
An independent variable (explanatory?) 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. Extraneous variables — other than ...
October 16, 2014

Statistics
What are "cubes"? What did you choose?
October 16, 2014

Statisitics
Population is the total group to which results will be generalized. A sample is a portion of that population.
October 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.
October 16, 2014

Statistics
In 1966, twins reared together have lower correlation than those raised apart.
October 16, 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 (.20) and its Z score. Insert into above equation to calculate raw score.
October 15, 2014

Math
with larger n, sample mean would be more accurate estiamate of population mean. If the population distribution is normal, larger sample n would be closer approximation of normal distribution.
October 15, 2014

Statistics
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 later post.
October 15, 2014

Statistics
http://davidmlane.com/hyperstat/z_table.html
October 15, 2014

Science HELP
You don't indicate which color is dominant. If Black is dominant, then C is correct.
October 15, 2014

math
Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown. AB * BC = AB^2C
October 15, 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 later post.
October 15, 2014

Math
Right.
October 15, 2014

math
A = 3B or B = A/3 C = 2A + 10 or A + B + C = 180 A + A/3 + (2A+10) = 180 Solve for A, then B and C.
October 15, 2014

Math
You are welcome.
October 15, 2014

Math
Yes
October 15, 2014

Basic Statistics
95% = mean ± 1.96 SEm 1.96 SEm = 200 SEm = SD/√n
October 15, 2014

Basic Statistics
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.005) and its Z score. a) 99% = mean ± Z SEm SEm = SD/√n b) increase n, use different confidence interval
October 15, 2014

Statistics
a) 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 of the Z score. Multiply by 100. b) same table, using .0559 to find Z. Insert into above equation to ...
October 15, 2014

Statistics
40,000/310,000,000 = 4/31,000 = ?
October 15, 2014

Psychology
http://drdavespsychologypage.homestead.com/Stress__A_Type_Personality.pdf
October 15, 2014

Science
It won't pull you in any specific direction in the center of the earth, but it will keep you there. Boy, will it be hot!
October 15, 2014

mathyeshoda
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.
October 14, 2014

Math
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 4/14 * 10/13 = 10/14 * 4/13 = ? The total is reduced to 13, because one shoe has already been taken.
October 14, 2014

stats
It needs to be both rather than one or the other.
October 14, 2014

Algebra
You need to factor the end terms. -21 = -7 * 3 or -3 * 7. The x^2 term factors into 2 and 1. Which combination will give 1x as a middle term?
October 14, 2014

Algebra
Yes, π.
October 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.
October 14, 2014

math
8/20 = x/40,000 Calculate for x.
October 14, 2014

algebra
-18 + 6n = 60 Add 18 to both sides, then divide by 6.
October 14, 2014

math
Factor 24 = 2 * 2 * 2 * 3 12 for 2 piles or 2 for 12 piles 6 and 4 = ? 8 and 3 = ?
October 14, 2014

statistics
Ho: Smoking has no effect on pregnancy Ha: Smoking causes premature birth
October 14, 2014

Math
If x = -4, then 10 -5(-4) = 10 + 20 = 30 (2,10) would be the solution. y = 15 + 10x
October 14, 2014

Photography
Agree.
October 14, 2014

math school g
1500 + 800 + 8000 = 10,300 for 8 panels 3200 - 10,300/2 (for four panels) = 3200 - 5150 = -1950 -1950/5150 * 100 = ? Salman won't be in business very long.
October 14, 2014

math
p = 100m/2
October 13, 2014

statistics
92,000 - 12,500 = 79,500 79,500/8 = 9,937.5 Have each interval 10,000 and start just below 12,500.
October 13, 2014

Math
What is your question?
October 13, 2014

Statistics and Probability
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 1/51 * 1/50 * 1/49 * 1/15 = ?
October 13, 2014

Math
1. x + y > 5 2. x > 1 3. 200x + 100y < 700 Cannot graph here.
October 13, 2014

statistics
Z = (score-mean)/SD Since I don't know the mean or SD, I can't help you find the raw score. Also, your values don't make sense. Do you mean: Z = 11.22 and Z = 20.48? If so, those are extremely deviant values. If not, you need to clarify your data.
October 12, 2014

Algebra 2
15 + .40m = 30 + .25m Calculate m. Once you find m, insert its value on either side to answer the last question.
October 11, 2014

Biology
Since this is not my area of expertise, I searched Google under the key words "contractions in digestive system" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=contractions+in+digestive+system&ie=UTF-8&oe=UTF-8&gws_rd=ssl In the ...
October 11, 2014

statistics
Assuming a normal distribution, if the mean (m) = 50, no value of standard deviation (s) would make 55 a measure of central tendency. If the distribution is skewed, s has no definite meaning. However, the mode or median could be 55.
October 11, 2014

statistics
I thought I answered this previously. If the Z scores are equal, he did equally well on both exams.
October 11, 2014

statistics
It depends on the mind set of the participants in each group. If they see themselves competing against other groups, they will do their best to help each other. However, if they view themselves as competing with others within the group, there may be sabotage or at least a lack...
October 11, 2014

statistics
a) Find the mean first = 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 b) Z = (score-mean)/SD...
October 11, 2014

statistics
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.25) in the smallest area for the Z score.
October 11, 2014

statistics
If the Z scores are the same, he did the same on both.
October 10, 2014

Science
Right.
October 10, 2014

word problem math b
km = 1000m 20,000 m/80 minutes = 250m/minute
October 10, 2014

equation
a+b : (2a +2b) = a+b : 2(a + b) = 1 : 2
October 10, 2014

Help Ms.Sue
Multiply by 12. 12/4 : 12/3 : 12(13/12) = 3 : 4 : 13
October 10, 2014

Pre algebra
1296 = 16 t^2 Divide both sides by 16. 81 = t^2 Get square root of both sides.
October 10, 2014

Algebra
Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown. What is your question? 5/2 ≠ 46/3 Second equation is correct.
October 10, 2014

Biology
Since this is not my area of expertise, I searched Google under the key words "homeostasis in cells" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=homeostasis+in+cells&ie=UTF-8&oe=UTF-8&gws_rd=ssl In the future, you can find the ...
October 10, 2014

Statistics
What is your question?
October 10, 2014

Nominal Data Be skewed?
You are correct; they cannot be skewed. http://drdavespsychologypage.homestead.com/Two___Two_____four.pdf
October 10, 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 (.05) and its Z score. Put values into above equation and solve for raw score.
October 9, 2014

Math
Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown. 2,724 * 588 = 1,601, 712 3000 * 600 = 1,800,000
October 9, 2014

Math
I get 10.84 * 10^24 = 1.084 * 10^25 A and D are the same, except for the notation.
October 9, 2014

Math
$25 - $18 = $7 still owed. $7 + $18 = $25
October 9, 2014

Math
No, which has the higher power of 10?
October 9, 2014

Math
Yes.
October 9, 2014

Science
Yes.
October 9, 2014

Algebra 2
Lacking data.
October 9, 2014

math!
x = W 2x = L x-3 = H H * L * H = volume
October 9, 2014

Math Need Help. No Idea how to solve
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.025) and its Z score. 95% = mean ± Z SEm SEm = SD/√n
October 8, 2014

Sociology (Statistics) Confidence Level
95% = mean ± 1.96 SEm SEm = SD/√n = 1/√35 = 1/5.92 = .17 .17 * 1.96 = .33 95% = mean ± 1.96 SEm = 3 ± .33 = 2.67-3.33 Rounding error?
October 8, 2014

statistics
Parameters are data on total populations, while statistics are data on portions of a population (samples).
October 8, 2014

statistics
From your data, he did equally well on both exams.
October 8, 2014

statistics
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. Second equation has wrong SD.
October 8, 2014

MATH (STATS)
A) SEm = SD/√n B) 95% = mean ± 1.96 SEm C) Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.005) and its Z score. Substitute that for the 1.96 in B equation.
October 8, 2014

Algebra
What problem?
October 8, 2014

statistics
22 is two SD below the mean, in other words, Z = -2. 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 and distance from the mean. ...
October 8, 2014

Statistics-Help please??
Was this the equation they gave you? Z = (score-mean)/SD Just insert values and solve for Z.
October 8, 2014

statistics
What is your question?
October 8, 2014

Sociology (stats) help
Continue calculations to find Z. Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the least proportion/probability for each Z score. Either-or probabilities are found by adding the ...
October 8, 2014

Psychological Statistics
Z = (score-mean)/SD Insert you data to calculate the mean.
October 8, 2014

General Psychology
Nicotine
October 8, 2014

psychology
http://drdavespsychologypage.homestead.com/Decision_Trap.pdf
October 7, 2014

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.
October 7, 2014

Statistics
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 later post.
October 7, 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.
October 7, 2014

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