Saturday
April 30, 2016

# Posts by PsyDAG

Total # Posts: 21,595

math
(23.5^2)/64 = ?
December 25, 2015

maths
What is your question? I assume: 3x^3 - 2x^2 - 9x + 9
December 25, 2015

Statistics
How many squares do you have in your Chi-square?
December 23, 2015

Statistics
Use the Chi-square (X^2) method. 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 ...
December 23, 2015

Math
If the pennant is a right triangle, you only need one. The theorem does not apply, unless you are concerned with the length of sides or hypotenuse.
December 22, 2015

Math
The Pythagorean Theorem applies only to right triangles. Will your pennant be a right triangle? A pennant is typically an isosceles triangle. Can you construct an isosceles triangle from a group of right triangles?
December 22, 2015

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 (.04) and its Z score. Insert Z into above equation and solve for score.
December 22, 2015

math
w - 1 = b r = w + 2 r + w + b = 28 (w+2)+ w + (w-1) = 28 Solve for w, then r and b.
December 20, 2015

Math
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 will be happy to evaluate your work though.
December 19, 2015

Physics needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.
December 19, 2015

math
m = 2s (m-10) = 4(s-10) Substitute 2s for m in the second equation and solve for s.
December 19, 2015

Language (?)
What novel?
December 18, 2015

science
Mother would have to be BO, so child has a chance of A phenotype. Use a Punnett Square. https://www.google.com/search?client=safari&rls=en&q=punnett+square&ie=UTF-8&oe=UTF-8&gws_rd=ssl Since hemophilia is an X-linked gene, what is the chance of getting the hemophila gene from ...
December 18, 2015

english
When Not to Use Commas with Who and Which There is often confusion about when to use commas with who and which. Unfortunately, there is no simple rule. Sometimes there should be commas and sometimes there should not. The rule is: When the information provided by the clause is ...
December 17, 2015

science help
Shouldn't that be done BEFORE severe weather occurs?
December 17, 2015

Science
1. d 2. b 3. c 4. b
December 17, 2015

Biology
No figure. Cannot copy and paste here.
December 17, 2015

Biology
Right!
December 17, 2015

Biology
No, acidic is below 7.
December 17, 2015

Statistics
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 will be happy to evaluate your work though.
December 17, 2015

Algebra 1
He's hungry? Lack Data.
December 17, 2015

math
5.4/810(converted to feet) = ? 1m = 3.28 feet
December 17, 2015

Math
No figures shown. Cannot copy and paste here.
December 17, 2015

math
15/5 = 3 (15-3) + 12 = ?
December 17, 2015

math
December 17, 2015

Statistics
Histogram would also be normally distributed. How many modes does a normal distribution have? Do you know the 68-95-99.7 rule? Approximately 68% of scores in normal distribution are within one standard deviation (34% on each side of the mean), 95% within 2 SD, and 99.7% within...
December 16, 2015

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 (.90) and its Z score. Insert data into equation and solve for score.
December 16, 2015

Statistics
It would help if you proofread your questions before you posted them. Have no data on ovens. 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/...
December 16, 2015

science help PLS
Although this is not my area of expertise, I would choose larger.
December 16, 2015

science
December 16, 2015

S.S
No following. Cannot copy and paste here.
December 16, 2015

Math (Statistics)
(1-.81)21 = ?
December 14, 2015

Science
Which would be needed for a predator rather than the prey?
December 14, 2015

statistics
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. 12/50 * (12-1)/(50-1) * (12-2)/(50-2) = ?
December 13, 2015

probability distribution
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. Do you mean "no" red balls or number of red balls?
December 13, 2015

Biology
Assuming that the DNA changes effect phenotype and/or behavior (some do not), your assumption is correct. No clarification necessary.
December 13, 2015

Biology
The endocrine system refers to the collection of glands of an organism that secrete hormones directly into the circulatory system to be carried towards distant target organs. Since the hypothalamus also secretes hormones, I would pick B.
December 13, 2015

math
3G + 3 = M = 48 Solve for G.
December 13, 2015

statistics
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 will be happy to evaluate your work though.
December 11, 2015

Statistics
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 related to the Z score.
December 11, 2015

tRNA
Since this is not my area of expertise, I searched Google under the key words "tRNA" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=tRNA&ie=UTF-8&oe=UTF-8&gws_rd=ssl In the future, you can find the information you desire more ...
December 10, 2015

Science
It would help if you proofread your questions before you posted them. 1a same as 1b, 1c same as 1d. Saturn revolves around the Sun in 30 hours? 2D, 4A, 5D, 6B, 7D, 8A
December 10, 2015

Science
What is the context of this picture? Where is it in relation to the textual material?
December 10, 2015

Comptuer Science
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 will be happy to evaluate your work though.
December 9, 2015

geometry
December 9, 2015

probability
If multiplication is right for first question, I agree. Second question not completely stated. if for 2 red and either blue or green, then it is right.
December 9, 2015

math
One side is y^2. There are six sides. Take it from there.
December 9, 2015

math3, probability and statistics
Online "^" is used to indicate an exponent, e.g., x^2 = x squared. If x = 5, I don't see how any of the other equations are valid (e.g., x^5= 10).
December 9, 2015

Statistics
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 related to the Z score. Is it greater or smaller than .05?
December 9, 2015

math
1.2x = 40 Solve for x.
December 8, 2015

Research
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.
December 8, 2015

statistics help
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 related to the Z score.
December 8, 2015

Help with College Stat class
Typical significance level is p ≤ .05.
December 7, 2015

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. Agree.
December 7, 2015

math
Need specific problem as example.
December 7, 2015

HELP
December 7, 2015

Algebra 2
Online "^" is used to indicate an exponent, e.g., x^2 = x squared 3^4 - 6(3^3) - 4(3^2) - 18 - 2 = ?
December 7, 2015

Math
The sex ratio at birth worldwide is commonly thought to be 107 boys to 100 girls, although this value is subject to debate in the scientific community. The sex ratio for the entire world population is 101 males to 100 females. Order of birth bgg gbg ggb gbb bgb bbg ggg bbb
December 7, 2015

Math
Infinity minus one?
December 7, 2015

Science plz help its really inportant
Nucleus has heredity factors and is largest organelle.
December 7, 2015

statistics
It would help if you proofread your questions before you posted them. What is a "bidge cad"?
December 7, 2015

Math
The ones where you designate an answer are all correct. Give your best answer for the remainder.
December 7, 2015

maths
It would help if you proofread your questions before you posted them.
December 7, 2015

math needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.
December 7, 2015

Math
To differ by 54 one must be relatively high and the other low and they need to be even numbers.
December 7, 2015

stat
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 (±.005) and the Z score. Insert data into first equation to solve.
December 7, 2015

Psychology
First, do you see sweating as a stimulus or response? Second, is it something that has to be learned (conditioned)?
December 6, 2015

Science
Gravity on the moon is about 17% of earth's gravity.
December 6, 2015

Math
11 + .18m = 18 + .13m Solve for m, then substitute value for m on either side.
December 6, 2015

Science
The moons gravity is approximately 17% that of earth.
December 6, 2015

Math - age problem
L - 1 = 3(J - 1) L + 2 = 2(J +2) = 2J + 4 L = 2J + 2 Substitute 2J + 2 for L in the first equation and solve for J. Insert that value into the last equation to solve for L. Check by putting both values into the first equation.
December 6, 2015

math
5.665, 5.674
December 6, 2015

Maths
With range = 8 one of the missing numbers is 5 or 14. Mean = ∑x/n (5+6+11+9+7+8+13+x)/8 = 9 Solve for x. If necessary, try with 14.
December 6, 2015

Biology
Since this is not my area of expertise, I searched Google under the key words "reproductive cycle of pines" to get these possible sources: https://www.google.com/search?client=safari&rls=en&q=reproductive+cycle+of+pines&ie=UTF-8&oe=UTF-8&gws_rd=ssl In the future, you...
December 6, 2015

Science
Total mass/ mass of one bag = number of bags
December 6, 2015

math
December 5, 2015

statistics
Ho: mean = 1400 Ha: mean < 1400 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 related to the Z score.
December 5, 2015

stat
90% = mean ± Z (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 (p = ±.05) and its Z score. Insert data into first equation.
December 5, 2015

Biology
D, D, C
December 5, 2015

No Polygon A. Cannot copy and paste here.
December 4, 2015

STATISTICS
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 related to the Z score.
December 4, 2015

Opinion Question
In many cases, technology allows us to exceed our limitations. Our strength is being able to develop the technologies.
December 4, 2015

math 210 fundamentals of geometry
No table. You cannot copy and paste here. Also, what is your question?
December 4, 2015

math
x + (x+44) = 180º Solve for x, then x +44.
December 4, 2015

Algebra 1
No Scatterplot. You cannot copy and paste here.
December 3, 2015

Math HELP!
It would help if you proofread your questions before you posted them. Incomplete. f(t) = ?
December 3, 2015

sampling distributions & parameter estimation
Expected mean = 50 SEm = SD/√n
December 3, 2015

Look them up in a dictionary. If you don't have a hard copy, try http://www.learnersdictionary.com/definition/
December 3, 2015

statistics
15 * 2 = 30
December 3, 2015

science
December 2, 2015

Mathematics
Mean = ∑x/n (.87 + .89 + .91 + .85 + 2x)/6 = .9 Solve for x.
December 2, 2015

physics needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.
December 1, 2015

science
Last one, Meiosis II
December 1, 2015

Algebra 1
When multiplying/dividing, exponents are added/subtracted respectively. (-x^3)(-x^1) = -x^4 = x^4 since minus times minus = positive
December 1, 2015

Pre algebra
50 - x < 39
December 1, 2015

Math
Combine terms. The x^2 terms cancel out. -2x-3 = -x-3 -x = 0 Do you have typos?
December 1, 2015

Math
See previous post. Multiply proportion found by 60.
December 1, 2015

Math
See previous post.
December 1, 2015

Math
Z = (score-mean)/SD Use the table.
December 1, 2015