Search: AP Statistics - Sampling Distribution Help

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AP Statistics - Sampling Distribution Help
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Thursday, February 3, 2011 at 6:46pm by Anonymous

Math (Statistic)
Considered the sampling distribution of a sample mean obtained by random sampling from an infinite population. This population has a distribution that is highly skewed toward the larger values. a) How is the mean of the sampling distribution related to the mean of the ...
Monday, February 19, 2007 at 3:26am by Jennifer

AP Statistics
When finding a confidence interval for a population mean based on a sample of size 11, which assumption is made? The standard deviation is fixed. The sampling distribution of z is normal. The sampling distribution of the sample means is approximately normal. There is no ...
Monday, October 29, 2012 at 3:28pm by Anonymous

statistics
what is sampling distribution and sampling distribution of means?
Sunday, November 21, 2010 at 12:27am by ash

Math- Statistics
A random sample of size 36 is to be selected from a population that has a mean μ = 50 and a standard deviation σ of 10. * a. This sample of 36 has a mean value of , which belongs to a sampling distribution. Find the shape of this sampling distribution. * b. ...
Tuesday, February 8, 2011 at 9:14pm by Tammy

statistics
An SRS of size n is taken from a large population whose distribution of income is extremely right-skewed and the mean income is calculated. Which of the following statements is false? a) When n > 30, the sampling distribution of is approximately normal. b) When n ...
Tuesday, April 17, 2012 at 8:51pm by Anna

Statistics
How do frequency tables, relative frequencies, and histograms showing relative frequencies help us understand sampling distributions? A. They help us to measure or estimate of the likelihood of a certain statistic falling within the class bounds. B. They help us visualize the ...
Sunday, September 26, 2010 at 6:55pm by Randy

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 random sample of size 36 is to be selected from a population that has a mean μ = 50 and a standard deviation σ of 10. - - Find the mean of this sampling distribution. - Find the standard error of this sampling distribution.
Friday, September 30, 2011 at 7:21am by robyn

Statistics
The t distribution should be used when ___. the sampling population is not normal the sampling population is unimodal The sampling distribution is normal and the population standard deviation is unknown the population standard deviation is known
Tuesday, June 22, 2010 at 11:02am by John

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

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
When finding a confidence interval for a population mean based on a sample of size 11, which assumption is made? The standard deviation is fixed. The sampling distribution of z is normal. The sampling distribution of the sample means is approximately normal. There is no ...
Friday, October 26, 2012 at 1:23pm by What?

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

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

AP Statistics - Sampling Distribution Help
1) Z = (score-mean)/SD 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. 2) Mean is the same, but SEm (standard error of the mean) = SD/√(n-1) 3) Use SEm ...
Thursday, February 3, 2011 at 6:46pm by PsyDAG

statistics
1. True. Parameters are data from the total population, while statistics are data from samples. 2. True. A sampling distribution is the probability distribution, under repeated sampling of the population, of a given statistic (a numerical quantity calculated from the data ...
Thursday, February 5, 2009 at 10:44pm 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
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
Is there a rule to figure out if this is a true or false statement? A sample size of 900 is not large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is .995.
Sunday, October 24, 2010 at 4:11pm by none

Statistics
Is a sampling distribution always the same as the curve for a null hypothesis? How does the power of a z test change when sigma increases? Assuming that they are caused solely by chance, sampling distributions will approximate a normal distribution more closely as the size of ...
Wednesday, December 27, 2006 at 7:25pm by Cheri

Statistics
A researcher found a sample proportion of 0.94 for estimating the population proportion of freshmen at a university who had Facebook accounts. If the standard deviation of the sampling distribution of the sampling proportion is 0.02, what is a 95% confidence interval for the ...
Friday, May 18, 2012 at 5:09pm by Mary

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

statistics
The sample mean to be calculated from a random sample of size n= 4 from a population consists of eight measurements (2, 6, 9, 12, 25, 29, 39, 50) . find the sampling distribution of y .(Hint : there are 70 samples of size 4 when sampling from a population of eight measurements )
Sunday, November 14, 2010 at 1:18am by koky

statistics
One method for estimating the availability of office space in large cities is to conduct a random sample of offices, and calculate the proportion of offices currently being used. Suppose that real estate agents believe that of all offices are currently occupied, and decide to ...
Monday, March 26, 2012 at 12:50am by tea

Statistics and Probability
A computer supply house receives a large shipment of blank CDs each week. Past experience has shown that the number of flaws per CD can be described by the following probability distribution, where the random variable X represents the number of flaws per CD. x P(X = x) 0 0.65 ...
Wednesday, March 9, 2011 at 3:52pm by Adam

Statistics
M80,sd10,s8,n25 how do I calculate the sampling distribution parametes
Sunday, May 13, 2012 at 9:27am by Mildred

statistics
Is the standard deviation of the entire sampling distribution of means a statistic or a parameter?
Monday, March 1, 2010 at 9:56pm by KLM

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

Statistics for healt professional
Calculate the sampling distribution parameters U=80,O=10,s=8,n=25
Saturday, September 15, 2012 at 11:59am by CArline

statistics
the mean annual income for adult women in one city is and the standard deviation of the incomes is The distribution of incomes is skewed to the right. For samples of size 30, which of the following statements best describes the sampling distribution of the mean?
Sunday, April 8, 2012 at 11:16am by Taisha

statistics
Suppose a population distribution of SAT scores has population mean 500 and population standard deviation 100. What is the mean of the sampling distribution of sample means, ybar , calculated from samples of size n = 36
Friday, November 11, 2011 at 8:12pm by Emmily

statistics
for the following data, calculate the sampling distribution parameters. u=120, o= unknown, s= 18, n=36
Wednesday, January 18, 2012 at 5:31pm by jim

statistics
For a population with a mean of 30 and standard deviation of 6, describe the sampling distribution of the means for samples of N=9.
Tuesday, November 3, 2009 at 4:32pm by Ashley

Sampling Distribution Complete solutions and illus
Sampling Distribution Complete solutions and illustrations are required. 1.The average annual salary for all U.S. teachers is $29,863. Assume that the distribution is normal and the standard deviation is $5,200. a.Find the probability that a randomly selected teacher earns at ...
Wednesday, February 27, 2013 at 10:51pm by Rhea

Statistics
How large a sample from N(80,20) population is needed so that the sampling distribution of the mean has a standard deviation of 1?
Tuesday, January 4, 2011 at 7:05am by Casey

Statistics
How large a smaple from a N(80,20) population is needed so that the sampling distribution of the mean has a standard deviation of 1?
Tuesday, January 4, 2011 at 6:59am by Alana

statistics
According to internal testing done by the Get-A-Grip tire company, the mean lifetime of tires sold on new cars is 23,000 miles, with a standard deviation of 2500 miles. a) If the claim by Get-A-Grip is true, what is the mean of the sampling distribution of for samples of size...
Monday, March 26, 2012 at 12:49am by tea

statistics
Can any help me how to solve below problem.? I am student and learning OC curve and double sampling plan. Can you someone help me how to understand this concept? A shipment of 1000 items is to be inspected on a sampling basis. The producer and the consumer have agreed to adopt...
Sunday, October 9, 2011 at 1:17am by saran

Sampling 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/probability related to the Z score.
Wednesday, February 27, 2013 at 10:53pm by PsyDAG

AP Statistics - Sampling Distribution Help
The composite scores of students on the ACT college entrance examination in a recent year had a Normal distribution with mean µ = 20.4 and standard deviation = 5.8. 1) What is the probability that a randomly chosen student scored 24 or higher on the ACT? 2) What are the ...
Thursday, February 3, 2011 at 6:46pm by Erica L

AP Statistics - sampling distribution help
The composite scores of students on the ACT college entrance examination in a recent year had a Normal distribution with mean µ = 20.4 and standard deviation = 5.8. 1) What is the probability that a randomly chosen student scored 24 or higher on the ACT? 2) What are the ...
Wednesday, February 2, 2011 at 11:06pm by Erica L

statistics
for the following data calculate the sampling distribution parameters where, µ=120 ó=unknown,s=18,n=36, how can we find E[M] and SE[M]
Sunday, July 22, 2012 at 9:47am by joshy

Statistics
The mean of the sampling distribution of the sample proportion is equal to the population proportion.
Friday, March 22, 2013 at 3:59pm by MathGuru

Statistics
Which of the following is(are) not true about sampling bias a. Sampling bias is inevitable when conducting a survey b. Quota sampling is still vulnerable to bias c. Biased samples may trigger some insights or suggest grounds for a new study but they are not generalizable d. ...
Saturday, June 14, 2008 at 3:11pm by Mike

statistics
I'm working on a statistics project and need to evaluate the expected value using hypergeometric distribution. I am unsure which variable to assign with value in the probability and expected values for the following data: "you work for a manufacturer who recieves ...
Monday, March 16, 2009 at 8:15am by cp

statistics
Number sampled is 1,000 and mean is 7.2 on a scale from 1-10 how do I determine standard deviation. Can we answer this with using the sampling distribution of the sample proportion?
Saturday, February 13, 2010 at 9:50pm by mark

statistics
the mean of all possible means(when dealing with a sampling distribution) will be equal to the population mean.
Wednesday, November 30, 2011 at 11:05pm by wanda

Sampling Distribution
Sampling Distribution Complete solutions and illustrations are required. 2.In a study of life expectancy, it was found that the mean age at death in the Philippines was 72 with a standard deviation of 5.8 years. If a sample of 50 Filipino people is selected, find the ...
Wednesday, February 27, 2013 at 10:53pm by Rhea

Statistics
how you can use sampling distribution and the concept of Central Limit Theorem to apply information and make good predictions and estimations when you shop for a particular item or product?
Monday, July 20, 2009 at 4:59pm by Lina

Sampling Distribution
Sampling Distribution Complete solutions and illustrations are required. 4.The average breaking strength of a certain steel cable is 2000 pounds, with a standard deviation of 100 pounds. A sample of 20 cables is selected and tested. Find the sample mean that will cut off the ...
Wednesday, February 27, 2013 at 10:54pm by Tina

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

res342
In conducting research that looks at differences in populations, samples are used for numerous reasons. Using entire populations in a test is difficult, so various sampling techniques are applied. In situations in which the population variance is unknown, the Student t ...
Saturday, May 14, 2011 at 8:33am by jack

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 (Verify My Answers)
In regard to my original question I now think that the sampling method would be cluster sampling. Is that correct?
Wednesday, December 2, 2009 at 5:51am by Linda

statistics
i have a question regarding statistics. i just don't know how to do it and would really appreciate if someone could tell how i can solve it. the question is; a population of scores contains exactly 5 scores : 2, 3, 6, 8, 11 a) there are 5x5=25 different samples of two ...
Saturday, November 20, 2010 at 11:50pm by ash

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

Sampling Distribution
a. Z = (score-mean)/SD b. Z = (score-mean)/SEm SEm = SD/√n With both problems, find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.
Wednesday, February 27, 2013 at 10:54pm by PsyDAG

Statistics
For each of the following rejection regions, sketch the sampling distribution for z and indicate the location of the rejection region, and determine the probability that a type 1 error will be made.
Friday, January 1, 2010 at 9:00am by Shaunda

Statistics
What is the probability that we would obtain two sample means that differ by 1.875, when the SD of the sampling distribution is estimated at .125 when our sample has 8 subjects?
Sunday, October 7, 2012 at 8:36pm by nina

math300
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 simulation ...
Sunday, February 6, 2011 at 6:12pm by Karen

statistics
I need so help figuring out which statement is true or false. 1. A parameter always describes a larger group than a statistic. 2. The sampling distribution of a statistic is the distribution of values taken by the statistic in all possible samples of all possible sizes from ...
Thursday, February 5, 2009 at 10:44pm by Sue

Math--Statistics
I have a couple of questions that need review--I've answered them, but I'm not sure if I'm correct. 1.)Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now imagine ...
Tuesday, March 15, 2011 at 12:07pm by Anonymous

statistics
the assets (in billions of dollars)of the four wealthiest people in a particular country are 46,34,12,10. Assume that the samples of size 2 are randomly selected with replacement from this population of four values. After listing the possible sample and finding the mean of ...
Tuesday, December 20, 2011 at 1:17am by nannie

Sampling Distribution
Sampling Distribution Complete solutions and illustrations are required. 5.The standard deviation of a variable is 15. If a sample of 100 individuals are selected compute for a.The standard error of the mean. b.What sample size is necessary to double the standard error of the ...
Wednesday, February 27, 2013 at 10:55pm by Tina

Statistics
A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of 36 will be based on a á= ______ and a corresponding Zá of ___
Monday, March 5, 2012 at 3:49am by Jeff

Math/Statistics
STATISTICS PLEASE HELP!!!!! I am sorry this is jy second time posting, but I really need help. I have tried contacting my teacher and classmates with no luck. Please just steer me in the right direction!: Suppose cars arrive at Burger King's drive-through at the rate of 20...
Saturday, October 22, 2011 at 6:21pm by Jake

Sampling Distribution
Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√(n-1) 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 ...
Tuesday, May 17, 2011 at 9:48am by PsyDAG

Statistics
1. The scores of students on the ACT college entrance examination in a recent year had a normal distribution with a mean of 18.6 and a standard deviation of 5.9. A simple random sample of 60 students who took the exam is selected for study: a) What is the shape, mean(expected...
Friday, March 25, 2011 at 1:59pm by Tasha

MTH233/statistics UOP
A car company says that the mean gas mileage for its luxury sedan is at least 21 miles per gallon. You believe the claim is incorrect and find that a random sample of five cars has a mean gas mileage of 19 miles per gallon and a standard deviation of 4 miles per gallon. Assume...
Tuesday, July 27, 2010 at 7:32pm by sue

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
Suppose cars arrive at Burger King's drive-through at the rate of 20 cars every hour between 12:00 noon and 1:00 pm. A random sample of 40 one-hour periods between 12:00 noon and 1:00 pm is selected and has 22.1 as the sample mean number of cars arriving. (a) Why is the ...
Saturday, October 22, 2011 at 11:05am by Jake

statistics
Find the definitions of systematic, cluster, and random sampling. One hint: for random sampling, a random number table can be used to choose samples.
Monday, November 14, 2011 at 5:24pm by MathGuru

Stats-BOB PURSLEY Help, do you know this?
Is there a rule to figure out if this is a true or false statement? A sample size of 900 is not large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is .995.
Sunday, October 24, 2010 at 6:11pm by help

stats
Given a normal distribution with µ = 80, σ= 5, and given a sample size of n = 25, describe the following characteristics of the sampling distribution: 1. Central tendency 2. Variability
Tuesday, October 23, 2012 at 4:46pm by Komal

Statistics
A normally distributed population has a mean of 40 and a standard deviation of 12. What does the central limit theorem say about the sampling distribution of the mean if samples of size 100 are drawn from this population.
Tuesday, July 17, 2012 at 11:26pm by Christie

Statistics
Standard error of the mean is the standard deviation of the sampling distribution of the means. Take the standard deviation (15) and divide by the square root of the sample size (100) for your answer.
Sunday, October 14, 2012 at 9:41pm by MathGuru

statistics
Suppose that, in fact, the blood cholesterol level of all men aged 20 to 34 follows the normal distribution with mean of u = 188 milligrams per deciliter (mg/dl) and standard deviation = 41 mg/dl. 1. Choose an SRS of 100 men from this population. What is the sampling ...
Monday, February 4, 2013 at 12:08pm by Zachovia

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

statistics
In a survey of 400 college students, 40 were left-handed. Treating the sample as if it were random and using 0.015 as the standard deviation of the sampling distribution of the sample proportion, what is the lower bound of a 95% confidence interval for the population proportion?
Friday, May 18, 2012 at 10:19pm by D

Stats
Which of the following would be closest to a normal distribution? a.) The sampling distribution of the average weight of 40 eggs randomly selected from the stock at the High Street Kroger's grocery? b.) The sampling distribution of the average weight of 4 eggs randomly ...
Wednesday, November 9, 2011 at 10:03pm by Manda

math
The sample mean to be calculated from a random sample of size n= 4 from a population consistsof eight measurements (2, 6, 9, 12, 25, 29, 39, 50) . find the sampling distribution of y y .(hint : there are 70 samplesof size 4 when sampling from a population of eight measurements )
Saturday, November 13, 2010 at 11:06am by heba

statistics
Random samples of size n=10 are taken from a normal population whose statndard deviation is known to be 5. Calculate the area under the sampling distribution curve for x bar between the points u-1 and u+1. That is find the probability that the sample mean lies within + or = 1 ...
Friday, November 23, 2012 at 9:32pm by joe

statistics
The standard deviation of the sampling distribution of the mean is called the standard error of the mean. I'm assuming that is what you wish to calculate. If so, determine the standard deviation and divide by the square root of the sample size.
Tuesday, June 19, 2012 at 4:53pm 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

statistic
1.The state highway patrol stops every 5th car on highway 210 to check drivers' licenses and registrations. Which sampling technique are they using? systematic sampling -chose this one convenience sampling cluster sampling simple random sampling stratified sampling 2.You ...
Friday, July 13, 2012 at 6:56am by bria

statistics
Random samples of size n are selected from a normal population whose standard deviation is know to be 2. Suppose you want 90% of the area under the sampling distribution of x bar to lie within + or - 1 unit of a population mean u. Find the minimum sample size n that satisfies ...
Friday, November 23, 2012 at 9:29pm by joe

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

AP Statistics
12) Which of the following statements is true? a) The sampling distribution of the difference between two proportions will always be normal. b) When comparing two population proportions, either sample proportion can be used as the unbiased estimate of the true population ...
Thursday, March 14, 2013 at 4:53pm by Joker

statistics
A population has a mean =80 and a standard deviation =8. find the mean and standard deviation of a sampling distribution of sample means with sample size=64
Tuesday, February 12, 2013 at 10:39am by antorio

Sampling Distribution
Sampling Distribution Complete solutions and illustrations are required. 3.The mean systolic blood pressure of normal adults is 120 millimeters of mercury (mm Hg) and the standard deviation is 5.6. Assume that the variable is normally distributed. a.If an individual is ...
Wednesday, February 27, 2013 at 10:54pm by Dre

statistic (incomplete)
There is no data for the sampling distribution.
Saturday, April 7, 2012 at 12:05pm by PsyDAG

Statistics (Verify My Answers)
If I do a research project and my hypothesis is that attitudes of human services providers towards HIV/AIDS would improve after participation in a program would my sampling method be simple random, stratified or cluster sampling? I think it would be simple random sampling but ...
Wednesday, December 2, 2009 at 5:47am by Linda

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