Saturday

December 20, 2014

December 20, 2014

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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