# Posts by PsyDAG

Total # Posts: 23,418

mathes
How do you define "under age"… less than the mean? Mean = sum of scores/number of scores I'll let you do the calculations.

STAT
99% = mean ± Z (SEm) SEm = SD/√n Z for ±.005 = 2.575 Calculate.

mathematics
Lacking data. What is its shape?

Statistical work
Z = (score-mean)/SD Use table In back of text labeled area under normal distribution. C. Either-or probabilities found by adding individual probabilities. D,E. Both probabilities found by multiplying individual probabilities.

Stat HW for.
1b. 1/4 = .25 Probability of both found by multiplying individual probabilities. E. .5 * (1-.25) = ?

Statistics
Z = (mean-mean)/SEm SEm = SD/sqrt n Use table in back of text labeled area under normal distribution.

Statistical concept 68-95-99.7
Don't repeat posts. It wastes our time responding to them. See your later post.

Maths!
Lacking data. How many colors/marbles?

Stat
Z = (score-mean)/SD Use table labeled area under normal distribution in the back of your text. Either-or probabilities found by adding individual probabilities. Both probabilities found by multiplying individual probabilities.

MATH
A more exact answer to cups = 5/(5+1+3+2) = 5 /11 = .45

MATH
3/(6+1+2+3) = ?

MATH!
Boys< 30-16

MATH
Without the outlier, the mean (which functions as a balance point) would be lower.

math
2/5 * 150 = ?

Math
54/(7+2) = 6 Multiply the 7 and 2 by 6.

Math

Math
Second and third choices are correct. The correlation would only show straight line if there was perfect predictability (+1.00) for the positive trend.

math
2 * 3= ? 10 * 15 = ?

stats
Z = (52-50)/SEm SEm = SD/sqrt n Look up Z in table in back of your text labeled area under normal distribution.

math
Why do you divide the width by 4? Is That because the length is 1/4W?

math
You do not state relationship between width and length.

Maths

Math
Probability of 2 or more independent events occurring is found by multiplying the individual events Assuming replacement, P(both) = .08 * .08 At least one = one or two. Either-or probabilities are found by adding the individual probabilities. P(one) = .08 * .92 P(both) shown ...

math
Let X = tens and y = twenties X = 7 - y 10 X + 20 y = 100 Substitute 7-y for X in the second equation and solve for y, then use first equation to find x.

math help pls pls pls
0 no correlation

math
5/(30+12+5)=?

MaThS LITERACY; GEOGRAPHY;TOURISM AND ECONOMIC

Algebra
P.S. It is better to indicate specific topic in subject space to get a tutor who knows the subject. You lucked out this time.

School
B = 3C 2B + 4C = 30 Substitute 3C for B in the second equation to solve for C, then insert value in the first equation to find B.

math
(1-.10)X = 36 Solve for x.

math
2*24*2 minutes less.

Math
Cannot drag on these posts.

math
1/2 + 1/6 = 6/12 + 2/12 = 8/12 = 2/3 Neither do I. Probably a typo in the answer key.

Maths
(4 * 2) +1 = 9

Math needs help
Indicate specific topic so tutor with the right knowledge will respond.

Math
(12 - 7)/12 = ?

English

English
Either

Bio
Haploid

Scince

maths littercy ,agricultural science ,life science ,tourism , life orientatiom, ndebele and english

stats
No data set. You can't copy and paste here.

history,maths literacey,english,xitsonga,religion,

Statistic

dramatic art .tourism. history and math lit
Contact your school counselor with this question.

Elementary Statistics
Z = (score-mean)/SEm SEm = SD/sqrt n Use same table.

Algebra
Let X = initiation fee X + 18m = 3950 X + 7m = 3125 Subtract second equation from first to solve for m. Insert value into either equation to solve for X.

science help pls pls
Under changing conditions

science help pls pls
Hydro- = water Geo- = ground

science help pls pls pls
Dwarf planet

algebra
We cannot measure your subjects to get the data.

Algebra
You did a good job. What's your confusion?

math
(1-7/8)*12 = ?

i really need help with science pls help
No diagram. Can't copy and paste here.

Math
Either-or probabilities are added. 10/20 + 3/20 + 5/20 = ?

Stats - Help!!!
Disagree.

Stats - Help!!!
Agree.

Stats - Help!!!
Agree with second choice.

Stats - Help!!!
Need goal before sample.

Maths Lit, Geography, English, LO, EGD, Afr.

math
A = 6/8S 6A + 8S = 60 Substitute 6/8S for A in second equation and solve for S. Then use first equation to find A.

math

Stats
Since assignment is random, it is not C.

Stats
Agree. The blind condition will reduce probability of Jimenez treating them different.

stats
Use "areas under normal distribution" table in the back of your statistics text.

2, 4 are wrong. The rest are right.

Statistics
Don't repeat questions. It wastes our time responding to multiples. See your later post.

Science
1. Styrofoam insulates, copper conducts. 2. Warm air rises.

Urns and \$ - Pre-Algebra
P (both) found by multiplying them. 1. P(red,red) = 12/20*8/13 = ? 2. P(1,10) = 5/18 * 6/(18-1) = ?

Physics needs help
Indicate specific area in subject heading.

Math
No parts shown. Cannot copy and paste here.

Algebra (Correction)
J + D + K = 320 Solve for D, then K.

Algebra
J = D + 20 K = D/2 J + D + K = ? (D+20) + D + D/2 = ?

Mathematics

Health Plz help THX!!
Oxygen correct. Others unanswered or wrong. Seems like you are just guessing. Use your textbook.

Disagree with first answer but not sure about second but guess at cast.

Those variations (mutations) that lead to survival in the environment continue. If not, those go to extinction.

science
Different, gas, solid or liquid. You supply why.

biology
The sperm and egg are each haploid.

Statistics
5,352/100,000 = ?

Statistics
26*26*10^3 = ?

Math
Any value to the zero power = 1

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.

math
let x = fiction books. 3x + x = 2000 Solve for x then 3x.

Math
From your info: 2/4 = x/8 Solve for x.

Math
5 + .10k > 1 + .50k Solve for k.

math
9.5 * 2/3 = ?

math
Unclear about the meaning of 6 1.

math
24/15 = x/18 Solve for x.

math
260/13 = 20 8(20) + 5(20) = 260 Can you work it from there?

Math
57(1.08) = ?

math
1. If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. I. (50/90)^2 = ? II. Generalize from I. III. (50/90)(40/90) = ? 2. Either-or probabilities are found by adding the individual...

Math
\$450 * 52 = ? Assuming that "tax" was inserted in error: [\$115(52) + .095(\$125,000)/52] = ? Subtract one from the other.

Mathematics
No, did you try the other alternatives? -1 = 2(-2) + 1 = -3

Mathematics
Disagree.

statistics
Need to know mean and standard deviation. 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 between the two Z scores.

Math (???)
No table.

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