Thursday

April 17, 2014

April 17, 2014

Number of results: 10,723

**Statistics**

If you already have the Standard Deviation (SD), SEm(Standard Error of the mean) = SD/√(n-1) I don't understand the meaning of the numbers in parentheses.
*Sunday, November 21, 2010 at 9:01pm by PsyDAG*

**statistics**

The average for the statistics exam was 72 and the standard deviation was 4. Kelsey was told by the instructor that she scored 1.85 standard deviations below the mean.
*Tuesday, December 3, 2013 at 4:23am by Anonymous*

**Statistics**

True or False The mean for a sample of n = 4 scores has a standard error of 5 points. This sample was selected from a population with a standard deviation of ƒã = 20.
*Thursday, December 12, 2013 at 10:19pm by Lyndyc*

**Statistics**

Is this right? and how can I break it down if needed? A factory’s worker productivity is normally distributed. One worker produces an average of 75 units per day with a standard deviation of 20. Another worker produces at an average rate of 65 per day with a standard deviation...
*Friday, February 11, 2011 at 10:37pm by Kimberly*

**Math : Probability and Standard Deviation**

This is a word problem. "We know that for certain workers the mean wage is $5/hr with a standard deviation of $.50. We need to find out if a worker is chosen at random what is the probability that the workers' wage is between $4.50 and $5.50? Assume a normal distribution of ...
*Tuesday, October 23, 2007 at 4:32pm by Tiffany Johnson*

**stats(help)**

Our students were asked to rate their admiration of Hillary Rodham Clinton on a scale of 1 to 7. They were asked to rate their Jennifer Lopez and Venus Williams on a scale of 1 to 7. The mean rating of Clinton was 4.06 with a standard deviation of 1.70. The mean rating of ...
*Thursday, March 12, 2009 at 5:47pm by Sue*

**probability**

estimate approximate standard deviation to be 2400/4=600 mu=2500, standard deviation 600, above 2400 My calculator says... 0.5662 http://davidmlane.com/hyperstat/z_table.html
*Saturday, May 4, 2013 at 2:26pm by bobpursley*

**algebra 2**

check out: http://www.easycalculation.com/statistics/learn-standard-deviation.php
*Thursday, May 6, 2010 at 4:59pm by Damon*

**math**

Statistics: Analyze student exam scores Students were given an exam with 300 multiple choice questions. The distribution of the scores were normal and the mean was 195 with a standard deviation of 30. you may find it helpful to draw out this distribution before answering the ...
*Wednesday, March 21, 2012 at 6:01pm by ro*

**chem**

a mean = 0.5, and the standard deviation is 1.84*10^-3 ( gassian statistic apply). How many replicated if the standard error of the mean is not excess 0.001%. Please help, thank you so much
*Friday, April 22, 2011 at 8:16pm by lyn*

**QNT**

A sample of 100 students participate in a final exam. The mean score is 88 with a standard deviation of five (5). What is the standard error of the measurement of the mean?
*Saturday, October 29, 2011 at 8:44pm by Needs Help*

**Statistics**

Using the normal approximation to the binomial distribution, find the mean and standard deviation, then use z-scores to find your probability. Your values are the following: p = .45, q = 1 - p = .55, x = 45, and n = 110 Now find mean and standard deviation. mean = np = (110)(....
*Saturday, June 26, 2010 at 9:38am by MathGuru*

**statistics**

The average amount spent at a fast-food restaurant in California was $3.30, with a standard deviation of $.40. Yet in Georgia, the average amount spent at a fast-food restaurant was $3.25, with a standard deviation of $.10. What do these statistics tell you about fast-food ...
*Monday, March 25, 2013 at 2:17pm by Donna*

**statistics**

we developed a 95% z confidence interval for the mean BMI of women aged 20 to 29 years, based on a national random sample of 654 such women. we assumed there that the population standard deviation was known to be 7.5. in fact the sample data had mean BMI of 26.8 and standard ...
*Tuesday, April 20, 2010 at 3:58pm by steven*

**Pre-calculus**

I am not sure what "t" is supposed to be, but the interval that the salary will be in 99% of the time is 600 + or - 206.4 206.4 happens to be 2.58 times the standard deviation. Your t may be what other texts usually call s, the deviation from the mean divided by sigma
*Friday, January 23, 2009 at 11:56am by drwls*

**statistics**

Would someone mind checking me and pointing out which may be incorrect. I THINK I get it but.... Calculate the range, variance, standard deviation for the data set given 72, 80, 80, 82, 88, 90, 96? I just wanted to know if I am doing this correctly. These are my answers. I ...
*Friday, September 10, 2010 at 3:00pm by Flower*

**Math - Standard Deviation**

A General Electric soft white 3-way bulb has an average life of 1200 hours with a standard deviation of 50 hours. Find the probability that the life of one of these bulbs will be between 1150 and 1300 hours. You need to change the times to Z-scores â€” scores given in terms of...
*Friday, July 22, 2005 at 1:24am by GetYourLeash*

**Standard Error Of Mean?**

In a random sample of 30 tires of the same type, it is found that the average life span of a tire is 36,200 miles with a standard deviation of 3,800 miles. Find the standard error of the mean. a 126.67 b 693.78 c 9.53 d 587.24
*Monday, April 23, 2012 at 8:43pm by Help Please?*

**Stats**

Exercise 6-8 The Downtown Parking Authority of Tampa, Florida, reported the following information for a sample of 235 customers on the number of hours cars are parked and the amount they are charged. Number of Hours Frequency Amount Charged 1 18 $3 2 33 7 3 49 10 4 44 15 5 34 ...
*Tuesday, September 28, 2010 at 10:46am by Nicole *

**Statistics (Math)**

A government report looked at the amount borrowed for college by students who graduated in 2000 and had taken out student loans. The mean amount was = $ 17 , 776 and the standard deviation was s = $12,034. The quartiles were Q 1 = $9900, M = $15,532, and Q 3 = $22,500. The ...
*Saturday, October 13, 2012 at 3:27am by karen*

**Statistics**

If I'm interpreting this problem correctly and since the suggestion is to approximate the distribution by using the Gaussian (or normal) distribution, I would first find the z-score equated to 1% using a z-table. That would be -2.33 (below the mean of the distribution). Next, ...
*Sunday, March 1, 2009 at 11:50am by MathGuru*

**STATISTICS**

500 is a fairly big number, so you can use a Normal approximation to the binomial distribution to work this out. The binomial parameters you want are N = 500 and P = 0.8. The mean is just N.P = 400. The standard deviation is sqrt(N.P.(1-P))=8.94. The 95% cutoff value from a ...
*Friday, April 2, 2010 at 7:17am by DQR*

**maths**

(Standard Error of the mean) SEm = SD/√(n-1) However, no SD (Standard Deviation) has been given, because the summary of results would not copy and paste.
*Sunday, May 8, 2011 at 4:39pm by PsyDAG*

**Stor 155**

Use the definition of the mean to show the sum of the deviation of the observations from their mean is always zero. This is one reason why variance and standard deviation use squared deviations.
*Thursday, August 30, 2012 at 1:38pm by ami*

**statistics**

worried about customer complaints and potential lawsuits, the manufacterers decided that no more than o.5% of bags of Crunchy corn chips should be underweight. there are 2 possible adjustments that can be made; change the mean setting on the filling machines while leaving the ...
*Wednesday, October 10, 2007 at 8:31am by sophs*

**statistics**

7. A sample of 40 observations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second population. The sample mean is 99 and the sample standard deviation is 6. Conduct the following ...
*Sunday, February 28, 2010 at 11:51pm by Barbara*

**statistics**

The cholesterol levels of young women aged 20 to 34 vary approximately normal with mean 185 milligrams per deciliter and standard deviation 39 mg/dl. Cholesterol levels for men vary with mean 222mg/dl and standard deviation 37 mg/dl Sandy's cholesterol level is 220 her fathers...
*Wednesday, September 5, 2012 at 1:14am by Gee*

**Math**

I. Use Chebyshev’s theorem to find what percent of the values will fall between 156 and 276 for a data set with a mean of 216 and standard deviation of 12. II. Use the Empirical Rule to find what two values 68% of the data will fall between for a data set with a mean of 219 ...
*Friday, January 21, 2011 at 12:10am by Tameka*

**Stats**

I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205 and standard deviation of 11. II. Use the Empirical Rule to find what two values 99.7% of the data will fall between for a data set with a mean of 297 ...
*Saturday, October 15, 2011 at 12:22pm by Jennifer*

**Psychology**

Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a control group do not. After 6 months, both groups are tested on their knowledge. The experimental group has a mean of 38 on the test (with an estimated population standard ...
*Monday, September 19, 2011 at 7:26pm by summer*

**Math-Statistics**

I. Use Chebyshev’s theorem to find what percent of the values will fall between 156 and 276 for a data set with a mean of 216 and standard deviation of 12. II. Use the Empirical Rule to find what two values 68% of the data will fall between for a data set with a mean of 219 ...
*Thursday, January 20, 2011 at 11:32pm by Tameka*

**statistics**

If someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation = 15, then that person’s numerical score would be…?
*Sunday, July 10, 2011 at 5:47pm by Jenny*

**statistics**

What would a person's numerical score be if someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation =15?
*Thursday, August 30, 2012 at 7:32pm by Pat*

**STATISTICS**

Standard error: Is always the standard deviation divided by the square root of n. Is a measure of the variability of a sample statistic. Increases with bigger sample sizes. All of the above.
*Tuesday, August 6, 2013 at 3:54pm by Susie*

**Math-confused...plz help**

I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205 and standard deviation of 11. II. Use the Empirical Rule to find what two values 99.7% of the data will fall between for a data set with a mean of 297 ...
*Sunday, October 16, 2011 at 8:51pm by Jennifer*

**Statistic**

Twenty students assigned to an experimental group receive 30 in a control group has a mean of 38 on the test (with an estimated population standard deviation of 3); the control group has a mean of 35 (with an estimated population standard deviation of 5). Using the .05 level, ...
*Saturday, October 10, 2009 at 11:18pm by Anonymous*

**Business Statistics**

1. Suppose that the mean of the annual return for common stocks from 1950 to 2012 was 9.4%, and the standard deviation of the annual return was 17.5%. Suppose also that during the same 62-year time span, the mean of the annual return for long-term government bonds was 4.6%, ...
*Wednesday, March 6, 2013 at 9:34am by Michelle*

**statistics**

Range = highest value - lowest For variance and standard deviation: 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. ...
*Saturday, October 16, 2010 at 6:02pm by PsyDAG*

**Statistics**

Assume there are two lakes containing trout and the weights of the trout in each lake are normally distributed. The distribution of trout weight in Lake A has a mean of 18 ounces with a standard deviation of 2 ounces. The distribution of trout weight in Lake B has a mean of 19...
*Thursday, November 24, 2011 at 11:09pm by Brea*

**Statistics**

Here's what you will need to answer this question: Lower limits = mean - 3(sd/√n) Upper limits = mean + 3(sd/√n) sd = standard deviation n = sample size You will need to calculate the mean and standard deviation from the data given. Once you have those values, you ...
*Friday, January 30, 2009 at 9:36pm by MathGuru*

**statistics**

Which is relatively better a score of 48 on psychology test or a score of 52 on an economics test, Scores on the psychology test have a mean of 87 and a standard deviation of 14. Scores on the economics test have a mean of 53 and a standard deviation of 8.
*Sunday, October 27, 2013 at 9:08pm by angela*

**statistics**

The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures students' study habits and attitudes toward school. Scores range from 0 to 200. The mean score for college students is about 115.8, and the standard deviation is about 32.9. A teacher ...
*Tuesday, March 1, 2011 at 7:56pm by Anonymous*

**probability and statistics**

Is this right? and how can I break it down if needed? A factory’s worker productivity is normally distributed. One worker produces an average of 75 units per day with a standard deviation of 20. Another worker produces at an average rate of 65 per day with a standard ...
*Sunday, January 9, 2011 at 1:04pm by Ann*

**Estimating Using Confidence Intervals**

An investor wants to determine the true average yield on a selection of investments from the Business week 1000. Suppose the investor draws a random sample of (n=40 firms) and finds an average yield on investment of (xbar = 5.00%) and a sample standard deviation (s = 1.50%). ...
*Tuesday, May 17, 2011 at 12:53pm by Angela*

**Statistics**

Use z-scores. First problem: z = (x - mean)/(sd/√n) Find two z-scores: z = (2.4 - 2.5)/(0.2/√50) = ? z = (2.8 - 2.5)/(0.2/√50) = ? Finish the calculations. Next, check a z-table to find the probability between the two scores. Find mean and standard deviation...
*Monday, December 16, 2013 at 12:53pm by MathGuru*

**Statistics**

If the original variance is 9 than the standard deviation is 3. George's score of 70 is 5 standard deviations from the mean (70-55=15/3=5). Then if the mean is moved to 70 we need to add 5 standard deviations to is (5 x 5 = 25) so his new score is 95.
*Saturday, October 23, 2010 at 8:18pm by Kelly*

**Statistics**

Mean = np = 150 * .15 = ? Standard deviation = √npq = √(150 * .15 * .85) = ? Note: q = 1 - p I'll let you finish the calculations. Once you have the mean and standard deviation, use z-scores: z = (x - mean)/sd Note: x = 20 After you calculate z, check a z-table to ...
*Saturday, February 16, 2013 at 8:36pm by MathGuru*

**Statistics**

Mean = np = 150 * .15 = ? Standard deviation = √npq = √(150 * .15 * .85) = ? Note: q = 1 - p I'll let you finish the calculations. Once you have the mean and standard deviation, use z-scores: z = (x - mean)/sd Note: x = 20 After you calculate z, check a z-table to ...
*Saturday, February 16, 2013 at 5:28pm by MathGuru*

**Statistics**

8. A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population. The sample mean is 2.59 and the sample standard deviation is .66. Conduct the ...
*Sunday, February 28, 2010 at 11:52pm by Barbara*

**finance**

The expected return on the market is 12% and the risk free rate is 7%. The standard deviation of the return on the market is 15%. Ones investor creates a portfolio on the efficient frontier with an expected return of 10%. Another creates a portfolio on the efficient frontier ...
*Thursday, May 17, 2012 at 12:06pm by benish*

**statistics**

Please show all of your work when answering the following: I. Use Chebyshev’s theorem to find what percent of the values will fall between 236 and 338 for a data set with a mean of 287 and standard deviation of 17. II. Use the Empirical Rule to find what two values 95% of the...
*Saturday, February 14, 2009 at 1:18am by Anonymous*

**Statistics: Range, Average Deviation, Standard Dev**

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. Subtract each of the ...
*Tuesday, October 18, 2011 at 1:44am by PsyDAG*

**Statistics**

Standard deviation? 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
*Thursday, August 11, 2011 at 6:14pm by PsyDAG*

**Math**

Susan owns a chocolate store. She sells her chocolate by the gram and needs to compare the weights of two chocolate batches. She randomly selects 100 pieces from each batch. The distrubition of both samples are normal. Batch 1 - (Mean Weight) 56 grams Standard Deviation - 6 ...
*Saturday, March 30, 2013 at 11:33am by Caroline*

**Statistics**

I believe you copied these questions incorrectly. The first one only makes sense if you meant: The amount of pyridoxine (in grams) in a multiple vitamin is normally distributed with (mean) = 110 grams and (standard deviation) = 25 grams. What is the probability that a randomly...
*Wednesday, July 23, 2008 at 8:17pm by drwls*

**Stats**

A large population has a mean of 200 and a standard deviation of 40. Which one of the following best describes the percentage of measurements that fall in an interval that is within two standard deviations of the mean?
*Friday, September 14, 2012 at 2:15pm by Natalie *

**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(HELP)ASAP**

What in the world does "in general" mean? Normally, in general you have a mean with some standard deviation known. run these numbers thru your calculator, find mean, and std deviation.
*Friday, March 8, 2013 at 9:33pm by bobpursley*

**math standard deviation**

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 I'll let you do the ...
*Saturday, January 19, 2013 at 1:03pm by PsyDAG*

**Algebra**

On a standardized test, the distribution of scores is normal, the mean of the scores is 75, and the standard deviation is 5.8. If a student scored 83, the student's score ranks 1. below the 75th percentile 2. above the 97th percentile 3. between the 75th percentile and the ...
*Tuesday, June 8, 2010 at 3:32pm by Priscilla*

**Statistics**

I have no idea of the significance of the ones and rectangles of dots. If you want a square root symbol (√), use the (option + v) keys. The standard deviation for a sample is usually indicated with s, but the mean of a population is indicated by µ (option + m). Subtract ...
*Friday, December 20, 2013 at 7:14pm by PsyDAG*

**Stats**

The amount of time Ricardo spends brushing his teeth follows a Normal Distribution with unknown mean and standard deviation. Ricardo spends less than one minute brushing his teeth about 40% of the time. He spends more than two minutes brushing his teeth 2% of the time. Use ...
*Thursday, October 9, 2008 at 11:31pm by Ann*

**Probability and Statistics**

A research psychologist believes that professional athletes tend to be more confident than the typical person. From previous testing, he knows that the scores for people in the general population are approximately normally distributed with a mean of 72 and standard deviation ...
*Sunday, April 29, 2012 at 7:52pm by Kim*

**stats**

Our students were asked to rate their admiration of Hillary Rodham Clinton on a scale of 1 to 7. They were asked to rate their Jennifer Lopez and Venus Williams on a scale of 1 to 7. The mean rating of Clinton was 4.06 with a standard deviation of 1.70. The mean rating of ...
*Thursday, March 12, 2009 at 7:46pm by sue*

**stats**

Our students were asked to rate their admiration of Hillary Rodham Clinton on a scale of 1 to 7. They were asked to rate their Jennifer Lopez and Venus Williams on a scale of 1 to 7. The mean rating of Clinton was 4.06 with a standard deviation of 1.70. The mean rating of ...
*Thursday, March 12, 2009 at 7:47pm by sue*

**statistics**

the universal baking ic purhases bags of flour which vary somewhat in weight. the bakery wants to determine if the mean weights per bag purchased from two suppliers are different, a) perform a hypothesis test at a 10 percent level if the supllier 1 sample mean is 49.74 punds ...
*Monday, April 16, 2012 at 7:33am by hypotheis*

**Statistics**

If you perform a statistical test, try a one-sample z-test. z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) Population mean = 80 Sample mean = ? (I don't see one listed) Standard deviation = 10.15 Sample size = 50 Once you...
*Monday, November 25, 2013 at 5:22pm by MathGuru*

**statistics**

A study found that citizens spend on average $1950 per year on groceries with a standard deviation of $100. Assume that the variable is normally distributed. 5. Identify the population mean. 6. Identify the population standard deviation. 7. Find the probability that a sample ...
*Friday, April 19, 2013 at 4:11pm by Cam*

******HELP**** STATISTIC**

The table below shows the probability distribution of the types of food purchased by students from the school cafeteria. What is the probability a student has purchased Caesar salad? (2 points) 0.17 Suppose houses are available for purchase during construction of a new ...
*Tuesday, March 25, 2014 at 1:48pm by Tikima*

**Statistics**

A packaging device is set to fill detergent power packets with a mean weight of 5 Kg. The standard deviation is known to be 0.01 Kg. These are known to drift upwards over a period of time due to machine fault, which is not tolerable. A random sample of 100 packets is taken and...
*Tuesday, October 26, 2010 at 6:31am by Shams*

**statistics**

A packaging device is set to fill detergent power packets with a mean weight of 5 Kg. The standard deviation is known to be 0.01 Kg. These are known to drift upwards over a period of time due to machine fault, which is not tolerable. A random sample of 100 packets is taken and...
*Friday, October 29, 2010 at 7:04am by anoop*

**statistics**

The most common intelligence quotient (IQ) scale is normally distributed with mean 100 and standard deviation 15. What score would put a child 3 standard deviations above the mean
*Monday, September 3, 2012 at 6:52pm by Gee*

**statistics**

The most common intelligence quotient (IQ) scale is normally distributed with mean 100 and standard deviation 15. What score would put a child 3 standard deviations above the mean
*Monday, September 3, 2012 at 7:00pm by Gee*

**English**

I am psueo conducting an experiment on 144 freshmen high school students who are evenly divided into 6 groups. The treatment group are receiving a new instructional strategy that the control group is not receiving. A t-test was conducted after a pre-test of a CBM measurement, ...
*Friday, August 3, 2012 at 10:13am by Anonymous*

**Help Please Statistic**

7. The table below shows the probability distribution of the types of food purchased by students from the school cafeteria. What is the probability a student has purchased Caesar salad? (2 points) 0.17 Suppose houses are available for purchase during construction of a new ...
*Monday, March 24, 2014 at 4:28pm by Tikima*

**statistic**

The mean salary per day of all the 5000 employees who work in a company is 150 Rs. and the standard deviation is 15 Rs. Let be x bar is the mean salary per day for a random sample of certain employees selected from this company. Find the mean and standard deviation for sample ...
*Thursday, September 1, 2011 at 1:08pm by sandhya*

**marketing research**

A packaging device is set to fill detergent power packets with a mean weight of 5 Kg. The standard deviation is known to be 0.01 Kg. These are known to drift upwards over a period of time due to machine fault, which is not tolerable. A random sample of 100 packets is taken and...
*Sunday, May 29, 2011 at 1:51am by anoop*

**statistics**

I.use the chebyshev's theorem to find out what percentage of the values will fall between 201 and 257 for a data set with a mean of 229 and standard deviation of 14. II. use the emperical rule to find out two values 68% of the data will fall between for a data set with a mean ...
*Monday, October 11, 2010 at 11:16pm by mary*

**statistics**

ok i was given a set of data asked to create a graph of my choice to represent the data then i'm asked Does the sahpe of hte distribution allow the use of the mean and the standard deviation to describe it? ok how does the mean and the standard deviation effect the shape of ...
*Thursday, July 23, 2009 at 9:20pm by statistics*

**Statistics- Math**

One student scored 54 on a math test for which the mean score was 50.5 and the standard deviation was 3.2. Another student scored 80 on a chemistry test for which the mean score was 75.2 and the standard deviation was 5.2. Which student (math or chemistry) had a "better" score...
*Friday, February 17, 2012 at 12:00pm by Kerrin*

**statistics**

For your first problem: Standard Deviation = 3.29 (Standard deviation is the square root of the variance) Variance = 10.82 (Variance is standard deviation squared) Using a chi-square table for the endpoints: (n-1)s^2/16 to (n-1)s^2/1.69 (8-1)10.82/16 to (8-1)10.82/1.69 7(10.82...
*Monday, March 18, 2013 at 12:32am by MathGuru*

**Statistics**

There are different ways you can do this kind of problem, but the formula below might be one of the easier ways: s/[1 + (1.645/√2n)] ..to.. s/[1 - (1.645/√2n)] ...where s = standard deviation, 1.645 represents the 90% confidence interval using a z-table, and n = ...
*Sunday, October 24, 2010 at 10:56pm by MathGuru*

**Statistics**

You are wondering whether male or female students pay more for books and materials at the U of C. You find 5 male friends at the U of C and find that they spent an average of $680 with a standard deviation of $5. You find 4 female friends at the U of C and find that they spent...
*Sunday, December 2, 2012 at 1:13pm by Susan*

**Maths**

If I have the mean and standard deviation of data how do I work out the percentage of data within 1,2,and 3 standard deviations of the mean? :) any help would be much appreciated thanks
*Saturday, October 22, 2011 at 5:38am by Zani*

**statistics**

1. A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
*Monday, June 18, 2012 at 4:51pm by tristen*

**algebra**

On his midterm exam, Jimmy scored 75 points, which was exactly 2 standard deviations above the mean. If the standard deviation for the test is 4, what is the mean for the test?
*Tuesday, October 29, 2013 at 6:03pm by Diandra*

**fiance**

Sonny owns $5,000 worth of High Risk Enterprises (HRE) stock. HRE has a standard deviation of 16 percent and a beta of 2.0. He wants to invest another $5,000 and create a $10,000 portfolio that is equally as risky as the overall market. Which one of the following will ...
*Monday, October 26, 2009 at 10:20pm by brandon*

**Math**

Sonny owns $5,000 worth of High Risk Enterprises (HRE) stock. HRE has a standard deviation of 16 percent and a beta of 2.0. He wants to invest another $5,000 and create a $10,000 portfolio that is equally as risky as the overall market. Which one of the following will ...
*Monday, October 26, 2009 at 10:26pm by brandon*

**Investing**

Sonny owns $5,000 worth of High Risk Enterprises (HRE) stock. HRE has a standard deviation of 16 percent and a beta of 2.0. He wants to invest another $5,000 and create a $10,000 portfolio that is equally as risky as the overall market. Which one of the following will ...
*Monday, October 26, 2009 at 11:15pm by brandon*

**Statistics**

Data from the latest census was analyzed. It was determined that one-parent households spend less on food away from home that do two-parent households. The mean amount spent by 30 one-parent households is $1876 and the standard deviation is $113. The mean amount spent by 30 ...
*Wednesday, April 4, 2012 at 4:50pm by Mike*

**statistics**

You have the mean 550 which is in the center of the normal distribution curve. and standard deviation is 110 which is how far the score is away from the mean. The question is asking you for 68.26, 95.44 and 99.74 percents and is demonstrated by the emperical rule that 68.26% ...
*Sunday, February 10, 2008 at 9:13pm by Tarun*

**statistics**

f someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation = 15, then that person’s numerical score would be…? A. 125 B. 130 C. 160 D. 90th Percentile
*Monday, February 20, 2012 at 9:13pm by Annie*

**statistics**

Can someone provide me with some assistance in answering this question.. A company manufacturers batteries in BATCHES of 18 and there is a 3% rate of defect. Find the standard deviation for the number of defects per batch. The probability of a defect is p = 0.03 The mean ...
*Sunday, August 5, 2007 at 9:45am by john*

**Math**

A friend claims that the average length of trout caught in this lake is 19 inches. To test this claim we find that a sample of 13 trout has a mean length of 18.1 inches with a sample standard deviation of 3.3 inches. The population standard deviation is unknown. If you assume ...
*Saturday, December 22, 2012 at 9:49pm by Alison*

**Statistics**

A study was conducted to investigate relationships between different types of standard test scores. On the Graduate Record Examination verbal test, 18 women had a mean of 538.82 and a standard deviation of 114.16, and 12 men had a mean of 525.23 and a standard deviation of 97....
*Wednesday, February 1, 2012 at 5:30pm by Anna*

**Stats**

A study found that for adults the general self-efficacy scale mean score was 35 and standard deviation was 12. A group of clients (n=14) was measured for their general self-efficacy with the same measure and found having 40 with standard deviation of 20. A group of therapist ...
*Saturday, August 17, 2013 at 4:38pm by Mark*

**math**

A standard IQ test has a mean of 98 and a standard deviation of 16. We want to be 99% certain that we are within 8 IQ points of the true mean. Determine the sample size
*Sunday, February 14, 2010 at 12:38pm by Tneshia*

**statistics**

The distribution score for a city wide math test scores results in a mean of 70 and a standard deviation of 12. What score is 2 standard deviations above the mean?
*Friday, September 30, 2011 at 11:07am by Anonymous*

**statistics**

A standard IQ test has a mean of 98 and a standard deviation of 16. We want to be 90% certain that we are within 8 IQ points of the true mean. Determine the sample size.
*Thursday, December 8, 2011 at 2:48pm by kat*

**statistics**

Use the normal approximation to the binomial distribution. First find mean and standard deviation. mean = np = (600)(.21) = ? standard deviation = √npq = √(600)(.21)(.79) = ? Note: q = 1 - p I'll let you finish the calculations. Next take .24 times 600. Use that ...
*Tuesday, April 12, 2011 at 10:27pm by MathGuru*

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