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Statistics homework distribution problem?
i need help with how to solve this: consider a normal distribution with mean 30 and standard deviation 2. what is the probability a value selected at random from this distribution is greater than 30? the book gives me the answer but i need to know how to solve it. please help?
Monday, February 20, 2012 at 9:31am by jess

AP Statistics
As the degrees of freedom for the t-distribution increase, the distribution approaches the value of zero for the mean. the t-distribution. the normal distribution. the F distribution. I'm thinking C...
Monday, October 29, 2012 at 3:28pm by Anonymous

Statistics
A mathematically defined curve that is the comparison distribution used in ANOVA is called the: - Normal distribution - Chi Square distribution - F distribution - T distribution
Sunday, October 11, 2009 at 10:06am by Trey

Statistics
As the degrees of freedom for the t-distribution increase, the distribution approaches the value of zero for the mean. the t-distribution. the normal distribution. the F distribution.
Friday, October 26, 2012 at 1:23pm by What?

Statistics
What is an example of a research problem at your organization that would benefit from the use of either descriptive statistics or probability distribution statistics?
Monday, October 11, 2010 at 3:10pm by Kathy

Statistics
A random sample of dates taken from headstones at a cemetery in Pleasanton, California, showed an average lifespan of 70 years with a standard deviation of 20 years. Assuming the distribution is unimodal, which of the following is most likely a good description of the ...
Sunday, October 9, 2011 at 4:45pm by Anonymous

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. However, I will help you with the first problem. 1a-e. Z = (score-mean)/SD Find table in the...
Sunday, February 3, 2013 at 12:26pm by PsyDAG

Statistics
I think I see your issue. You are testing whether the male distribution fits the female distribution. So, treat the female distribution as the expected distribution (E), and the male distribution as the observed (O). (Chi squared) = sum[ (O-E)^2/E ] 10 degrees of freedom.
Sunday, December 9, 2007 at 3:20am by economyst

Math
Can someone explain to me the rules of distribution. I have a word problem which asks my opinion of applying distribution to each problem but I don't completely understand distribution and when it is applied and when it isn't.
Saturday, November 14, 2009 at 10:46am by Anonymous

AP Statistics
I would also say D. If a problem does not say "assuming a normal distribution" in its statement, then one can use the t-distribution instead for smaller sample sizes (less than 30).
Monday, October 29, 2012 at 3:28pm by MathGuru

Statistics
Which of the following statements are correct? 1.A normal distribution is any distribution that is not unusual. 2.The graph of a normal distribution is bell-shaped. 3.If a population has a normal distribution, the mean and the median are not equal. 4.The graph of a normal ...
Wednesday, July 14, 2010 at 12:45am by Christy

statistics
Which of the following statements are correct? a. a normal distribution is any distribution that is not unusual b. the graph of a normal distribution is bell-shaped c. if a population has a normal distribution, the mean and the median are not equal d. the graph of a normal ...
Monday, May 10, 2010 at 11:09pm by Christine

statistics
1. Which of the following statements are correct? a.A normal distribution is any distribution that is not unusual.b.The graph of a normal distribution is bell-shaped.c.If a population has a normal distribution, the mean and the median are not equal.d.The graph of a normal ...
Friday, April 23, 2010 at 8:41am by nanny

Statistics
1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal. d. The graph of a ...
Monday, April 19, 2010 at 2:10am by Jackie

Statistics
Oops, I forgot. Here it is, an expected value distribution b. a discrete probability distribution c. none of these d. a continuous probability distribution e. a conditional probability distribution
Wednesday, October 10, 2012 at 12:42am by Tyson

statistics
I would choose b. For any symmetric distribution, the mean will be at the axis of symmetry of the distribution, and so will the median. The distribution does not have to be "mound shaped".
Sunday, December 23, 2007 at 5:14pm by drwls

Statistics
Run the simulation using n = 3= and n=10 for a uniform, a bell-shaped, and a skewed distribution. Identify the mean of the sampling distribution of sample means for each distribution
Monday, January 31, 2011 at 11:36pm by Bose

statistics
A normal distribution has a mean of 20 and a standard deviation of 2. If you convert every score in the distribution to Z scores, which of the following statements would be true of the resulting distribution?
Thursday, September 29, 2011 at 7:13pm by Anonymous

math
This site may help you understand normal distribution. http://www.netmba.com/statistics/distribution/normal/ The first one (letter a.) would depend upon the school. Some schools have many well-to-do families and only a few low-income famiies. Others would have more of a normal...
Tuesday, August 11, 2009 at 4:10pm by Ms. Sue

statistics
A vertical line is drawn through a normal distribution at z = 0.50, and separates the distribution into two sections. What proportion of the distribution is in the larger section? a. 0.6915 b. 0.3085 c. 0.1915 d. 0.3830
Sunday, October 14, 2012 at 12:09am by Robbie

Calculus
I'm doing statistics homework and am stuck on a problem using integration. The problem gives a distribution where for x>1, f(x) = k x^-6. I am then asked to "Determine the value of k for which f(x) is a legitimate pdf. " To be a legitimate pdf, the ...
Thursday, September 27, 2007 at 4:35am by Paul

Statistics
is the standard deviation a measure of the center or distribution... my teacher told me center i read the article and i\'ve been lead to believe its a measure of the distribution not the center... if it is a measure of the center how is it? I think it\'s a measure of ...
Sunday, August 30, 2009 at 7:46pm by Statistics

statistics
A) sorry, never took the subject so do not know the words, am physics major. B) homework mean = 81.7 homework s = 22.28 on a normal distribution table, 65% of class is below mean + .4 sigma = 81.7+8.912 = 90.6 so his score is above 90.6
Sunday, February 17, 2008 at 6:56pm by Damon

statistics
which of the following statements are correct? a. a normal distribuiton is any distribution that is not unusual. b. the graph of a normal distribution is bell-shaped. c. if a population has a normal distribution, the mean and the median are not equal. d. the graph of a normal ...
Monday, August 16, 2010 at 9:48am by jeff

statistics
Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has normal ditribution, the mean and the median are not equal. d. The graph of a normal ...
Saturday, May 8, 2010 at 4:06pm by Michelle

statistics
6. Which distribution has the larger mean? i) t distribution, (df = 30) ii) standard normal distribution A) i) B) ii) C) They are the same.
Wednesday, May 8, 2013 at 3:39pm by ali awan

Statistics
Find the probability when A. k = 2 and ë = 0.01 for Poisson distribution B. p = 0.01 and k = 2 for geometric distribution C. Repeat (b) when binomial distribution is used and n = 10
Tuesday, February 1, 2011 at 8:18pm by Nathan

Statistics
Its not an either/or answer. Yes, the t distribution has a mean of years. and Yes, it is a continuous distribution in the sense that the tails of the distribution go on to infinity (or neg. infinity)
Monday, November 24, 2008 at 5:29pm by economyst

statistics
Run the simulation using n = 30 and N = 10 for a uniform, a bell-shaped, and a skewed distribution. § Identify the mean of the sampling distribution of sample means for each distribution. § Evaluate if the results are what you expected for each distribution. Run the ...
Friday, January 28, 2011 at 5:48pm by ray

statistics
For a normal distribution with a mean of 140 and a standard deviation of 55 find each value requested. a. What is the minimum score needed to be in the bottom 10% of the distribution? b. What scores form the boundaries for the middle 75% of the distribution.
Sunday, April 29, 2012 at 6:19pm by tammy

Stats
A random sample of dates taken from headstones at a cemetery in Pleasanton, California, showed an average lifespan of 70 years with a standard deviation of 20 years. Assuming the distribution is unimodal, which of the following is most likely a good description of the ...
Sunday, October 9, 2011 at 4:44pm by Anonymous

Statistics
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the Z score for .4500 from mean (Z = 1.645) 90% conf. Interval = mean ± 1.645(SEm) SEm (Standard Error of the mean) = SD/?(n-1) There is a ...
Tuesday, October 26, 2010 at 9:41am by PsyDAG

statistics
From the data, mode = 32, median = 57 and mean 64, the distribution is definitely positively skewed (to the right). Unfortunately, I don't know Chevyshev's theorem, and I would not assume the distribution to be normal. However, for a normal distribution, Z = (score-...
Sunday, October 17, 2010 at 3:59pm by PsyDAG

Statistics
What is the 75th percentile of the adhesion distribution? A locomotive's 'adhesion' is the locomotive's pulling force as a multiple of its weight. A diesel locomotive model has adhesion which varies in actual use according to a Normal distribution with a mean ....
Tuesday, March 19, 2013 at 10:58pm by Anonymous

Statistics
These measurements do not "form" the normal distribution, but give dimensions of the normal distribution (measures of central tendency and variability). These allow you to determine where specific scores fall in the distribution, when you calculate the Z score. I ...
Wednesday, October 15, 2008 at 9:57am by PsyDAG

Statistics
I think you can calculate the Z-scores for yourself. The Z-score assumes a normal distribution, taking into account the mean and standard deviation. From calculus, we know the proportions/percentages in the normal distribution. (See a table in the back of your statistics text...
Wednesday, July 9, 2008 at 9:06pm by PsyDAG

statistics
A distribution of values follows a N(140,22) distribution. From this distribution you are drawing samples of size 12. Find the interval containing the middle-most 34% of the sample means. Round your values to 1 decimal place.
Thursday, October 27, 2011 at 10:56pm by Kim

Statistics
Here is another method. If it approximates a normal distribution, you can use Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores.
Sunday, February 12, 2012 at 4:50pm by PsyDAG

statistics
The two distribution means are being compared to each other. If the comparison distribution is the new fathers, mean = 64.5. If the comparison distribution is for the general population, mean = 60.
Sunday, April 11, 2010 at 12:28pm by PsyDAG

Statistics
a little bit rusty on statistics, i generally know how to set up the problems but not how to solve. thanks for any help you can give, especially with the integration bounds I'm confused with. X & Y have a joint distribution, and the following is the joint density fnct...
Monday, September 17, 2007 at 6:02pm by Kay

Statistics
But, I'm suppose to use the normal distribution approximation to the binomial distribution.
Friday, July 20, 2012 at 5:47pm by Ann

Statistics
What will adding 50 to each score in a distribution do to the standard deviation of that distribution?
Thursday, November 24, 2011 at 10:58pm by Brea

AP Statistics
You are correct! (The distribution approaches a normal distribution.)
Monday, October 29, 2012 at 3:28pm by MathGuru

statistics
A normal distribution is any distribution that is not unusual. (True/False)
Saturday, August 20, 2011 at 7:40pm by ann

statistics
A normal distribution is any distribution that is not unusual. True or false?
Thursday, August 19, 2010 at 10:45pm by Brenda

Statistics
Does the t distribution have a mean of zero, or is it a continuous distribution?
Monday, November 24, 2008 at 5:29pm by Britt

Statistics
Under what circumstances does the sampling distribution of the proportion approximately follow the normal distribution?
Friday, June 3, 2011 at 11:50pm by Dan

statistics
if several values equal to the mean of the distribution, are added to the distribution what will happen to the range?
Sunday, December 19, 2010 at 9:40pm by Anonymous

statistics
If this is for distribution of means, 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.
Friday, July 6, 2012 at 6:53pm by PsyDAG

statistics
mean = 68 By "expected distribution," I would assume you mean ± 3SD. Z = ±3 = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related...
Wednesday, March 20, 2013 at 10:57am by PsyDAG

statistics
1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. (True/False) b. The graph of a normal distribution is bell-shaped. (True/False) c. If a population has a normal distribution, the mean and the median are not ...
Saturday, August 20, 2011 at 7:26pm by ann

Statistics/Confidence Intervals
A t-distribution is sensitive to the size of the sample when considering confidence intervals. If a z-distribution is used instead of a t-distribution with small sample sizes, the confidence interval may be too narrow and the ability to estimate the true population mean may be...
Saturday, June 21, 2008 at 2:34pm by MathGuru

statistics
For a normal distribution with µ = 200 and ó = 50, what X values form the boundaries for the middle 60% of the distribution?
Tuesday, February 28, 2012 at 11:02pm by jau

statistics
a.A normal distribution is any distribution that is not unusual
Monday, May 3, 2010 at 6:24pm by Mercede

statistics
What is the mean and standard deviation of the distribution of normal temperatures? Z = (100.6 - mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to this Z score. Come to ...
Monday, May 10, 2010 at 11:54pm by PsyDAG

Statistics
A, B. 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 (B use.72) related to the Z score. Last two problems relate to distribution of means rather than a ...
Tuesday, March 26, 2013 at 8:55pm by PsyDAG

Statistics
A mound-shaped symmetrical distribution sounds normal to me. 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 scores.
Tuesday, December 11, 2012 at 4:21pm by PsyDAG

business statistics
The sampling distribution of x bar must be a normal distribution with a mean 0 and standard deviation 1. true or false
Monday, July 11, 2011 at 7:55pm by CS

Statistics
In a given normal distribution, the standard deviation is 14.4 and 8.27% of the distribution lies to the left of 60. What is the mean?
Sunday, October 3, 2010 at 8:35pm by Lori

statistics
If the N is large enough, the binomial distribution approximates a normal distribution. In that case, the Z score can be used. I hope this helps. Thanks for asking.
Friday, November 16, 2007 at 10:48pm by PsyDAG

Statistics
Find an example of application of Normal Distribution (or approximately Normal Distribution) in your workplace or business (or any other business that you are familiar with). Prove that the variable has the characteristics of a Normal Distribution. Recall that the variable ...
Friday, October 8, 2010 at 2:10pm by Kathy

MTH233/statistics UOP
Find an example of application of Normal Distribution (or approximately Normal Distribution) in your workplace or business (or any other business that you are familiar with). Prove that the variable has the characteristics of a Normal Distribution. Recall that the variable ...
Sunday, August 1, 2010 at 4:46pm by Joanne

statistics
(population) A normal distribution has a mean of 80 and a std dev of 20. For each of the following scores, indicate wheter the tail of the distribution is located to the right or left of the score, and find the proportion of the distribution located in the tail. a.X=85, B.X=92...
Thursday, February 7, 2008 at 10:22pm by Shane

Statistics
Using formula P(x) = x/15 For each of the values x = 1, 2, 3, 4, and 5. a. probability distribution of x. b. Show that the probability distribution of x satisfies the properties of a discrete probability distribution. c. mean of x. sketch the two specified normal curves on the...
Monday, October 26, 2009 at 2:35pm by Chinadoll

statistics
In a distribution of scores, X=62 corresponds to z=+0.50, and X=52 corrsponds to z=-2.00. Find the mean and standard deviation for the distribution.
Sunday, June 20, 2010 at 5:03pm by dray

statistics
A. Z = (score-mean)/SD (for distribution of scores) B. Z = (mean1 - mean2)/standard error (SE) of difference between means (for distribution of means) SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√(n-1) Since only one SD is provided, you can use just that to ...
Monday, July 19, 2010 at 10:41am by PsyDAG

Statistics
Assuming a normal distribution, 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 related to the Z score.
Monday, December 12, 2011 at 10:10pm by PsyDAG

Statistics teacher needed
normal distribution problem I do not know where your mean (expected return) and sigma are coming from. I assume some text book.
Sunday, July 15, 2012 at 6:03pm by Damon

Math (Statistics)
This is not right. I know how to find the mean, variance, and standard deviation normally. This problem is for probability distribution, which is an entirely different formula.
Monday, March 14, 2011 at 3:21pm by Heather

statistics
Let U, V be random numbers chosen independently from the interval [0; 1] with uniform distribution. Find the cumulative distribution and density of each of the variables (a) Y = U + V. (b) Y = Absolute value of (U - V).
Friday, March 23, 2012 at 2:06pm by oriana

statistics
A random variable X is best described by a continuous uniform distribution from 20 to 45 inclusive. The standard deviation of this distribution is approximately
Tuesday, August 16, 2011 at 8:46pm by Anonymous

statistics
which has a larger standard deviation: the distribution of weekly allowances to 12-year olds or the distribution of monthly household mortgage payments?
Wednesday, April 6, 2011 at 6:04pm by Jerome

Algenra
How do I work this problem, it is not a homework problem but a problem similar to a homework problem. I know i need to factor the left side of the problem. here is what I have so far.. x^2-2x+1=7 x^2-2x+1-7=7-7 x^2-2x-6=0 here is where I run into an issue, I can not seem to ...
Wednesday, October 3, 2007 at 11:12pm by Becca

Algebra
How do I work this problem, it is not a homework problem but a problem similar to a homework problem. I know i need to factor the left side of the problem. here is what I have so far.. x^2-2x+1=7 x^2-2x+1-7=7-7 x^2-2x-6=0 here is where I run into an issue, I can not seem to ...
Wednesday, October 3, 2007 at 10:25pm by Becca

statistics
It would help if you proofread your questions before you posted them. You probably have a typo. With SD = 140, one SD below the mean (90) would be -50. This means that you do not have a normal distribution. However, if the distribution is normal, Z = (score-mean)/SD Insert the...
Saturday, November 19, 2011 at 8:57pm by PsyDAG

statistics
Jiskha Homework Help forum is staffed by volunteers who answer questions when they have the time. It would help if you indicated what you know about the possible solutions to your problems. We help students, but we don't do their work for them. I know of no other free site...
Wednesday, July 25, 2012 at 8:45pm by Ms. Sue

statistics
The condition of scores being distorted in one direction or the other (towards the ends of the distribution) within a given distribution of data is known as
Friday, August 31, 2012 at 5:16pm by Jo-Anne

statistics
draw a distribution curve that represents the following distribution of scores: results of 6th grade math test given to college students
Saturday, October 15, 2011 at 7:39pm by Lopez

Statistics
Assume a population of any 4 numbers(suppose: 4,8,15,19). Select a random sample of size 2 with replacement from the population. List all the possible samples and their corresponding values of x̄ “x-bar” and then find the probability distribution of “X-...
Tuesday, November 16, 2010 at 6:52am by Ali

Probability and statistics
1. In a City, out of 20000 news paper subscribers, exactly 5000 subscribe to The Hindu. An advertising firm surveys 500 different subscribers of these 20000 subscribers. The random variable X = the number of The Hindu subscribers surveyed by the advertizing firm, has Choose ...
Friday, March 2, 2012 at 3:21am by Arun

Statistics
SEm = SD/√n Z = (score-mean)/SD or SEm, depending on whether you are talking about a distribution of individual scores or means respectively. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the...
Wednesday, August 17, 2011 at 2:20pm by PsyDAG

statistics
Solve the problem. Suppose a random variable x is best described by a normal distribution with μ = 60 and Find the z-score that corresponds to the value x = 69.
Sunday, July 17, 2011 at 4:06am by tit

Math (Statistics)
I am to find the mean, variance, and standard deviation for the probability distribution. I don't even know where to start. Here is the problem x P(x) 0 0.19 1 0.32 2 0.28 3 0.21
Monday, March 14, 2011 at 3:25pm by Heather

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. OR… what is the probability of being higher than the mean in a normal ...
Sunday, May 12, 2013 at 11:25am by PsyDAG

Statistics
Trying to finish an assignment: What happens to the power of the z test when the standard deviation increases? and Is the shape of a sampling distribution always the same as that of the null hypothesis population? Thanks! As the SD increases, the exactness of the estimate of a...
Wednesday, December 27, 2006 at 4:57pm by Cheri

statistics
60% is to the right of z = -0.25 90% is to the left of z = +1.28 "z" is (x-x(mean))/{standard deviation) You need a table of the error function or normal distribution to do this kind of problem.
Friday, February 29, 2008 at 1:36pm by drwls

Statistics
Please Help!!! I am having a small Problem Working this Problem. I am just not understanding. Could someone please assist? The lifetime of a brand of DVD player follows a normal distribution with a mean of 8 years and a standard deviation of 6 months. Find the probability that...
Wednesday, December 5, 2012 at 12:13am by Stacy

statistics
A normal distribution has a mean of 100 and standard deviation of 20. What is the probability of randomly selecting a score less than 130 from this distribution? a, p=0.9032 b, p=0.9332 c, p=0.0968 d, p=0.0668
Wednesday, November 7, 2012 at 8:48pm by Robbie

statistics
using a mean of 80 and a standard deviation of 12. a) what is the score that divides the distribution such that 99% of the area is below it. b) what are the scores that bound the middle 95% of the distribution
Saturday, February 19, 2011 at 7:47am by henrietta

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 related to the Z scores. This is a distribution of means, while your next post is a ...
Sunday, March 17, 2013 at 5:36pm by PsyDAG

statistics
Will the sampling distribution of means be approximately normal if n=25 or so, even if the frequency distribution of X values is not normal?
Sunday, September 25, 2011 at 4:55pm by Carol

Statistics
The probability distribution function for a normal distribution is f(x) = 1/(σ*sqrt(2*π))*e^[-(x-μ)^2/(2*σ^2)] How do I derive this?
Tuesday, August 11, 2009 at 5:46pm by Sean

Statistics
The standard normal distribution is the normal distribution with a mean of zero and a variance of one. So I would say C
Sunday, October 28, 2007 at 11:53am by chester

Statistics
A large number of children were surveyed. The table below shows the distribution of the time they spent watching TV in the week before the survey. Intervals include the left endpoint but not the right. You can assume that the times are uniformly distributed within each ...
Friday, March 15, 2013 at 10:36am by Andrea

statistics
Try the Poisson Distribution. Poisson distribution (m = mean): P(x) = e^(-m) m^x / x! Values: x = 8 m = 4 Substitute and calculate.
Wednesday, August 3, 2011 at 8:40am by MathGuru

statistics
Consider a normal distribution with mean 20 and standard deviation 3. What is the probability a value selected at random from this distribution is greater than 20?
Sunday, May 12, 2013 at 11:25am by erin

statistics
Have you calculated any of these to make a comparison? For example, range = 5, so you can eliminate A. Do the values form a normal distribution? If so, what do you know about a normal distribution?
Friday, April 22, 2011 at 6:20pm by PsyDAG

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