Number of results: 43,068
stats
So I have the mean as 162.5 and standard deviation 18.86 standard error =s/square root n =18.86/12= 5.44 t=m-mean/standard error = 150-162.5/5.44= -2.29 So we fail to reject Ho
Tuesday, March 12, 2013 at 1:49pm by kelly
AP Statistics
I assume that you are talking about a normal distribution with a mean of 1152 and standard deviation of 84. A Z score is the score in terms of standard deviations (SD), with -2 SD usually being considered low. Z = (x - ƒÊ)/SD, where x = weight value and ƒÊ...
Friday, November 16, 2007 at 11:10pm by PsyDAG
statistics
Suppose that the population standard deviation (ó) for a normally distributed standardized achievement test (ACT) is 6. What would the standard error of the sample mean (óxbar) be if we were to draw a random sample of 36 test scores?
Tuesday, October 4, 2011 at 3:53pm by Anonymous
Stats
National Packing Materials Company claims its X20 box can hold loads up to at least 80 pounds. Smith Widget Company has been using the boxes for one year and feels the boxes fail at lighter loads. Hearing the complaints from Smith, the lead engineer for National Packaging ...
Sunday, September 14, 2008 at 10:59pm by Arthur
statistics
A normal population has a mean of 21 and a standard deviation of 5. Compute the z value associated with 24 What proportion of the population is between 21 and 24? What proportion of the population is less than 18?
Sunday, November 21, 2010 at 2:07pm by Barbara
statistics
Computer Services wants to estimate the mean number of hours college students use on campus computers each day. They want to be within .1 hour of the true value with 99% confidence. From a previous study, the standard deviation is assumed to be .6 hour. What size sample is ...
Saturday, December 11, 2010 at 9:58pm by John Davis
statistics
a towns average snowfall is 33 inches per year with a standard deviation of 11 inches. how many standard deviations from the mean is a snowfall of 66 inches
Saturday, March 9, 2013 at 10:16pm by marie
Physics
Use the equation F = ma, but be sure F is the NET force up the incline. The net force will be the resultant of applied force, friction (if present) and gravity terms. A similar question was submitted yesterday. Was it by you? A more detailed answer was provided then.
Sunday, December 6, 2009 at 3:11pm by drwls
Statistics
IQ score are normally distributed with a mean of 95 and a standard deviation of 17. If the sample size is n=36 find the mean and standard distribution of sample mean
Sunday, April 7, 2013 at 2:47pm by Megan
statistics
Why is it the "√16" when n - 1 = 11? Standard error of the mean = Standard deviation/√(n-1) 95% confidence interval = mean ± 1.96 SE. Why are you not using mean = 186?
Tuesday, April 6, 2010 at 4:26pm by PsyDAG
Math 12
The mean % score after 8 exams is M, and the sum of the scores is 8 M. After 10 exams the sum of scores is 8M + 100 and the new mean is (8M +100)/10 = 0.8M + 10. Compare that with M. It is lower by (0.2M -10) A similar approach can be used for the new standard deviation. The ...
Thursday, May 20, 2010 at 11:54pm by drwls
Statistics
1. The sociologist surveyed the households in a small town. The random variable X represents the number of dependent children in the households. The following is the probability distribution of X: X 0 1 2 3 4 P(X) 0.07 0.20 0.38 k 0.13 (a) Find the missing probability value of...
Wednesday, June 1, 2011 at 11:33am by LadyJustice85
Math
If the population standard deviation is 8, how large a sample is necessary to have a standard error that is: a. less than 4 points? b. less than 2 points? c. less than 1 point?
Friday, February 1, 2013 at 11:01pm by Tracy
Finance
Security A has an expected return of 7%, a standard deviation of returns of 35%, a correlation coefficient with the market of -0.3, and a beta coefficient of -1.5. Security B has and expected return of 12%, a standard deviation of returns of 10%, a correlation with the market ...
Monday, July 4, 2011 at 2:11am by Jamal
Math
Continuous compounding: future value = present value * ert where t=number of periods, and r=rate future value/present value = 2 or ert=2 e0.06t=2 take natural log on both sides, 0.06t = ln(2) t=11.55 years. The rule of 69 ============== In fact, you can apply the rule of 69 ...
Friday, December 10, 2010 at 12:23am by MathMate
statistics
Prep Courses? Scores for men (nationwide) on the verbal portion of the SAT test are normally distributed with a mean of 509 and a standard deviation of 112. Randomly selected men are given the Columbia review course before taking the SAT test. After the course, a sample of 49 ...
Monday, June 28, 2010 at 7:22pm by STatistic
statistics
Suppose that the percentage returns for a given year for all stocks listed on the new york stock exchange are approximately normally distributed with a mean of 12.4 percent and a standard deviation of 20.6 percent. Consider drawing a random sample of n=5 stocks from the ...
Monday, November 9, 2009 at 11:45am by ileana
Probability / Statistics
I was wondering if someone could check my work thanks so the question is like so: The time it takes for a pendulum to complete the one period is simplified by the formula: T=2 pi square root (L/g) Where g is the constant measuring 9.80655m/s^2 and L is the length of the ...
Sunday, June 10, 2007 at 3:20pm by z score!
Stat/trig question, please help me, thanks
In 1995, more than 1.1 million students in the U.S. took the SAT. On the mathematics section, the mean =507, s=112 (standard deviation). Students recieve scores rounded to the nearest 10. What is the interval of student scores that lie within one standard deviation of the mean...
Tuesday, September 5, 2006 at 6:14pm by christine
Statistics
Suppose that the percentage returns for a given year for all stocks listed on the New York Stock Exchange are approximately normally distributed with a mean of 12.4 percent and a standard deviation of 20.6 percent. Consider drawing a random sample of n= 5 stocks from the ...
Monday, June 7, 2010 at 12:16am by Mary
statistics
Suppose that the percentage returns for a given year for all stocks listed on the New York Stock Exchange are approximately normally distributed with a mean of 12.4 percent and a standard deviation of 20.6 percent. Consider drawing a random sample of n= 5 stocks from the ...
Monday, August 31, 2009 at 6:58pm by Amy
Finance
Present value is an absolute. Future value is uncertain.
Tuesday, November 10, 2009 at 10:39am by Ms. Sue
Finance
differences between present value and future in time value
Tuesday, November 10, 2009 at 10:39am by soomal
math
The present value of an ordinary annuity is the sum of the present values of the future periodic payments at the point in time one period before the first payment. What is the amount that must be paid (Present Value) for an annuity with a periodic payment of R dollars to be ...
Monday, November 28, 2011 at 8:20pm by tchrwill
Statistics
Try a one-sample z-test for your problem. Using the z-test formula to find the test statistic: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) z = (3.69 - 3.65)/(.24/√45) Finish the calculation. Use a z-table to ...
Thursday, September 11, 2008 at 1:29am by MathGuru
Statistics
In hypothesis testing, if the population standard deviation is KNOWN, your graph should be labeled a T or Z line? In hypothesis testing, if the population standard deviation is NOT KNOWN, your graph should be labeled a T or Z line?
Wednesday, October 21, 2009 at 6:53pm by Kevin
SMU
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with a standard ...
Monday, December 19, 2011 at 2:45pm by carl
Statistics
Suppose that two different tests A and B are to be given to a student chosen at random from a certain population. Suppose also that the mean score on test A is 85, and the standard deviation is 10; the mean score on test B is 90, and the standard deviation is 16; the scores on...
Wednesday, February 16, 2011 at 4:03pm by Charles
Statistics
I am so lost on this statistics question would someone help me figure out how to answer it? A random variable X is normally distributed with the mean and standard deviation 1.6. What is the proportion of the data values that lies within 1.6 standard deviations from the ...
Tuesday, November 27, 2012 at 11:55am by Layney
chemistry
A scientist measures the standard enthalpy change for the following reaction to be -2923.0 kJ : 2C2H6(g) + 7 O2(g) 4CO2(g) + 6 H2O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO2(g) is _________
Wednesday, October 24, 2012 at 12:42am by Anonymous
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
Finance
Suppose you just inherited a gold mine. This gold mine is believed to have three years worth of gold deposit. Here is how much income this gold mine is projected to bring you each year for the next three years: Year 1: $49,000,000 Year 2: $61,000,000 Year 3: $85,000,000 ...
Sunday, November 13, 2011 at 9:55pm by Lamarr
statistics
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with a standard ...
Monday, March 1, 2010 at 3:23pm by Jennifer
math
A=PR^6 (calculate future value from present value P) R^6=A/P=3 (triple) R=3^(1/6) (sixth root of 3)
Wednesday, May 4, 2011 at 6:44pm by MathMate
Math
1)Find the standard deviation of the data set to the nearest tenth. (21,13,18,16,13,35,12,8,15) A)16.8 B)7.8 C)7.3 D)5.7 I chose C mean = 21+13+18+16+13+35+12+8+15/9 16.8 variance = (21-16.8)^2 = 17.64...did that with the rest and added them to get sqrt 53.7 standard deviation...
Saturday, February 23, 2008 at 1:54pm by Jon
statistics
A statistics practitioner would like to estimate a population mean to within 50 units with 99% confidence given that the population standard deviation is 250. a) What sample size should be used. b) Repeat part (a) with a standard deviation of 50. c) Repeat part (a) using a 95...
Saturday, March 13, 2010 at 8:46pm by Tom
physics
How long would our year be if our Sun were two fifths its present mass and the radius of the Earth’s orbit were six times its present value?
Thursday, May 6, 2010 at 8:02pm by erin
chemistry
Why are standard KMnO4 solutions are seldom used for the titrations of solutions containing HCl? 2. Why are standard solutions of reductants less often for titrations than standard solutions of oxidants? 3. When a solution of KMnO4 was left standing in a buret for 3 hours, a ...
Wednesday, May 13, 2009 at 9:19am by angel
Math
A carnival game consists of rolling a single fair die, with the following results: you win $8 for a 6, $7 for a 5, and lose $3 for any other number. Set a probability distribution, and calculate (already did) the Expected value = .50 Variance= 24.58 standard deviation= 4.96 ...
Thursday, December 13, 2007 at 12:32am by Anastasia
statistics
If your sample size is large (n is greater than or equal to 30), use z-value. If you have a small sample (n < 30), then use t-value. CI95 = mean + or - 1.96(sd divided by √n) ...where + or - 1.96 represents the 95% confidence interval using a z-table, sd = ...
Saturday, July 17, 2010 at 4:58pm by MathGuru
math: precalc
You are going to buy a $18,000 car. The dealer offers you $2000 cash back of nothing down and 0% financing for 60 months. If you take the financing, starting in one month you will pay one-sixtieth of $18,000 each month for 60 months. In some sense that is not really "0% ...
Monday, December 21, 2009 at 3:38pm by Ajax
stats
To test the hypothesis H0 : ì = 100 against H1 : ì > 100, a statistics practioner randomly sampled T observations and found the mean x = 106 and the standard deviation sx = 35. The value of the test statistic is equal to (1) 1.1743 (2) −1.7143 (3...
Wednesday, March 31, 2010 at 1:28pm by sam
Statistics
Calculate mean and standard deviation to find confidence interval (mean ± 1.645 SD). (SD value found in that same table.) For some of the other questions, be aware that, since raisins are heavier than the flakes, they are more likely to be found at the bottom of the ...
Saturday, January 16, 2010 at 2:06pm by PsyDAG
Statistics
The variance, which was (4.5)^2 = 20.25, is reduced by the ratio 12/14. That is because there are now 14 measurements and the two that were added equaled the previous mean value. New variance = 17.357 New standard deviation = 4.17 (= sqrt of variance)
Saturday, January 24, 2009 at 11:07pm by drwls
Statistics
In recording the self-reported lengths of a particular body part in a sample of male undergraduates, the largest was claimed to be 20 cm—a full 3 standard deviations from the mean length for the sample. The shortest alleged length was only 10 cm, which was equivalent to ...
Saturday, November 3, 2012 at 11:31pm by susan
stats
If the mean is 5.45 oz, and the standard deviation is 0.8, 99% will weigh less than 7.3 oz. That was obtained with a Java normal distribution web site by trial and error, varying the mean value. You could also use a rule that the upper bound should be 2.3 sigma from the the ...
Tuesday, June 14, 2011 at 11:03am by drwls
statistics
With 750 persons and a 90% probability, the most probable result would be 0.9*750 = 675 and the standard deviation would be sqrt[0.9*0.1*750] = 8.2. 657 is 2.2 sigma less than the mean. That may be consistent with your P-value of 0.028, but I'm not certain what that means...
Saturday, March 29, 2008 at 8:00pm by drwls
AP Statistics
I don't have a normal curve or a chart handy, so I will trust that your value of -.84 for .2 is correct. What that means is that 20% lies from the point .84 of a standard deviation to the left of the mean. .84(6)=5.04 so 20% of the cars will have a fuel efficiency of below...
Friday, November 9, 2007 at 10:05pm by Reiny
Business
You are the manager at a company and are asked to present a report on the year-to-date performance of your division. What type of statistical information would you include in your report? In particular, which descriptive statistics (mean, median, standard deviation, etc.) do ...
Thursday, May 19, 2011 at 8:33pm by Anonymous
statistics
We do not do your work for you, but here is some help. Mean(μ) = ΣX/N Standard Deviation(SD) = Square root of (Σd^2/N), where d = the deviation of each score from the mean. Z = (X-μ)/SD Insert the values from above for Z = 1.5 and -1.5. Then...
Tuesday, March 16, 2010 at 2:03am by PsyDAG
Math (Statistics)
Formula for the mean: SUM [x * P(x)] Take x times P(x) for each value listed. Then add for the mean. Formula for the variance: {SUM [x^2 * P(x)] - mean^2} Square each x. Then take x^2 times P(x) for each value. Add up the values for a total, then subtract mean squared from ...
Monday, March 14, 2011 at 3:25pm by MathGuru
Finance
Stone Inc. is evaluating a project with an initial cost of $8,450. Cash inflows are expected to be $1,000, $1,000 and $10,000 in the three years over which the project will produce cash flows. If the discount rate is 13%, what is the net present value of the project?
Sunday, December 6, 2009 at 9:31pm by Anonymous
math
find the present value of ordinary annuity payments of 890 each year for 16 years at 8% compounded annually What is the amount that must be paid (Present Value) for an annuity with a periodic payment of R dollars to be made at the end of each year for N years, at an interest ...
Sunday, September 24, 2006 at 11:26pm by john
statistics
The purchasing department has suggested that all new computer monitors for your company should be a new design. You want data to assure you that employees will like the new monitors. The next 20 employees needing a new computer are the subjects for an experiment. (a) Label the...
Friday, November 2, 2012 at 3:45am by appy
Math check
A population has a standard deviation ó of 28 units. (Give your answers correct to two decimal places.) (a) Find the standard error for the mean if n = 10. SD/Sqrt of N = 28/10^=.28
Thursday, June 13, 2013 at 9:00pm by Sue 71
STATS
1-Suppose that the fuel comsumption of cars for the same model is normally distributed. A random sample of ten new cars of the same model are randomly selected and their fuel consumption (l/100 km) is determined by subjecting them to a road test of 500 km. Their mean fuel ...
Thursday, April 1, 2010 at 4:41am by Judy and group
statistics
A manufacturer wishes to estimate the reliability (in months) of a certain product. An estimate of the population standard deviation from a previous sample was 12 months. If the manufacturer desires to be within 4 months of the true value with approximately 80% confidence, ...
Tuesday, November 8, 2011 at 11:28am by Larry
statistics
90% = mean ± 2.035 SD 2.035 was found by finding table in the back of a statistics text labeled something like "areas under normal distribution" to find the proportion (.45) between score and mean to get the Z score (value in terms of standard deviation).
Sunday, November 27, 2011 at 9:05pm by PsyDAG
statistics
Question2: When parking a car in a downtown parking lot, drivers pay according to the number of hours or fraction thereof. The probability distribution of the number of hours cars are parked is given below X 1 2 3 4 5 6 7 8 f(X) 0.30 0.24 0.17 0.10 0.08 0.05 0.04 0.02 a. ...
Sunday, December 11, 2011 at 10:30am by s.Alhosani
Finance
Assuming that the returns from holding small-company stocks are normally distributed, what is the approximate probability that your money will double in value in a single year? What about triple in value. Many of my classmates have an expected return of 17.6% and a standard ...
Sunday, July 15, 2012 at 6:03pm by Anonymous
math
well, in all of them interest, present value, future value, and inflation costs are always being used.
Saturday, December 11, 2010 at 6:29am by bobpursley
college
With examles give differences between present value and future value as used in financial mathematics.
Saturday, December 5, 2009 at 1:04pm by Lugee
sattistics
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 ...
Saturday, July 18, 2009 at 11:57am by Jerry
statistics
A statistics practitioner formulated the following hypothesis: Ho: population mean=200 H1: population mean<200 sample mean=190 n=9 population standard deviation=50 Calculate the p-value of the test
Friday, March 19, 2010 at 7:15am by Adam
stats
Formula for the mean: SUM [x * P(x)] Take x times P(x) for each value listed. Then add for the mean. Formula for the variance: {SUM [x^2 * P(x)] - mean^2} Square each x. Then take x^2 times P(x) for each value. Add up the values for a total, then subtract mean squared from ...
Tuesday, April 2, 2013 at 8:55pm by MathGuru
statistics
How do you find standard deviation?
Monday, February 27, 2012 at 8:42am by Allie
Statistics
Need to know standard deviation.
Wednesday, October 12, 2011 at 2:38pm by PsyDAG
standard deviation
SD^2 = Variance
Tuesday, September 20, 2011 at 7:33pm by PsyDAG
statistics
what was the mean,standard deviation?
Wednesday, October 6, 2010 at 3:21pm by bobpursley
Statistics
sd=standard deviation
Monday, February 8, 2010 at 9:52pm by Kendra
Statistics
37% of all doctors are family practitioners. If there are 300 doctors in one city, what is the standard deviation for the number of family practitioners? What is the expected value for the number of family practitioners?
Friday, September 24, 2010 at 6:20am by Lori
statistics
A professor informs her class that a test is very difficult, but the grades will be curved. Scores for the test are normally distributed with a mean of 25 and a standards deviation of 5. If she curves the grades by adding 50 to each grade, What is the new mean? What is the new...
Saturday, April 28, 2012 at 10:17pm by Sabrina
Statistics
Here are a few hints: 1. Use a one-sample z-test for both A and B, which is: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) 2. Find the critical or cutoff value to reject the null using a z-table for .05 level of ...
Monday, November 15, 2010 at 5:34pm by MathGuru
statistic
In a population of exam scores, a score of X 48 corresponds to z1.00 and a score of X 36 corresponds to z –0.50. Find the mean and standard deviation for the population. (Hint: Sketch the distribution and locate the two scores on your sketch.) A ...
Saturday, January 26, 2013 at 6:46pm by Nickie
Elementary Statistics
Heights of women have a bell-shaped distribution with a mean of 161 cm and a standard deviation of 7 cm. Using Chebyshev’s theorem, what do we know about the percentage of women with heights that are within 2 standard deviations of the mean? What are the minimum and ...
Tuesday, September 4, 2012 at 9:18pm by mary
financial management
Given below are the cash flows of a project. Find out the net present value of the project. Cost of capital is 18% and initial investment is Rs. 2,00,000. Year Cash Flows (lakhs) 1. 40 2. 45 3. 60 4. 60 5. 75
Wednesday, January 9, 2013 at 1:55am by anita
Statistic
18. 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 ...
Saturday, February 20, 2010 at 1:32pm by Doris I
Statistical Methods
Find your Z score = (x - μ)/SD, where x = desired value, μ = mean, and SD = standard deviation. Look up this Z score in the table in the back ofyour statistics text labeled something like "areas under the normal distribution." You can decide which ...
Tuesday, March 11, 2008 at 11:43pm by PsyDAG
Math statistisc
I have a 6 sided dice with numbers 1 to 6 written on faces. What number(s) would have to show up if you rolled the die five times in order to have the smallest possible standard deviation? What number(s) would have to show up if you rolled the die 5 times in order to have the ...
Tuesday, March 5, 2013 at 6:39pm by Bonnie
Math statistisc
I have a 6 sided dice with numbers 1 to 6 written on faces. What number(s) would have to show up if you rolled the die five times in order to have the smallest possible standard deviation? What number(s) would have to show up if you rolled the die 5 times in order to have the ...
Tuesday, March 5, 2013 at 6:38pm by Bonnie
Math statistisc
I have a 6 sided dice with numbers 1 to 6 written on faces. What number(s) would have to show up if you rolled the die five times in order to have the smallest possible standard deviation? What number(s) would have to show up if you rolled the die 5 times in order to have the ...
Tuesday, March 5, 2013 at 6:38pm by Bonnie
statistics
Formula for z-score: z = (x - mean)/sd Find mean: mean = np = (55)(0.512) = ? Find standard deviation: sd = √npq = √(55)(0.512)(0.488) = ? Note: q = 1 - p Finish both calculations. Substitute mean and standard deviation into the z-formula. Use 25.85 for x (...
Thursday, June 30, 2011 at 2:13pm by MathGuru
Statistics
Use a one-sample z-test. z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) With your data: z = (522.3 - 530)/(29/√85) = ? Finish the calculation. Check a z-table at .01 level of significance for a two-tailed test (...
Friday, March 8, 2013 at 9:35pm by MathGuru
statistics
Five students were randomly selected from a large university. The ACT scores for these students were 23, 12, 27, 32, and 26. Find the standard deviation for this sample data set. Round your final answer to two decimals, but do not round any value except the final answer.
Saturday, June 25, 2011 at 7:10am by Lakisha Devine
business statistics
for a sample of 12 items from a normally distributed population for which the standard deviation is  = 17.0, the sample mean is 230.8. At the 0.05 level of significance, test Ho : μ ≤ 220 versus Hı: μ >220. Determine and ...
Wednesday, July 29, 2009 at 4:47pm by Candy
Math
Are you sure that second formula isn't Ó(x-ì)²F? Unless it is, I can't see a way of calculating a standard deviation from the statistics supplied. On the assumption that the second statistic is Ó(x-ì)²F, the variance ought to be (1...
Friday, October 3, 2008 at 5:20am by David Q
business stat
1. Suppose quality control inspectors at the coffee house chain take a sample of 100 pieces of this chocolate product from an incoming shipment. They find a sample average of 60% cacao with a standard deviation of 8%. What is the standard error of the sampling distribution of ...
Monday, July 23, 2012 at 7:51pm by kristin
physics
A ball was shot from the angles given in the table below. The corresponding ranges (landing at the same height from which it is shot) for three trials are given below as well. A. Determine the average range and standard deviation for each angle. B. Next calculate the initial ...
Wednesday, October 20, 2010 at 7:46pm by Meghan
Algebra I
no let the amount that it "costed" 20 years ago be x then x(1.1)^20 = 10000 x = 10000/(1.1^20) I get 1486.44 you might have seen the formula Present Value = amount (1+i)^-n then Present value = 10000(1.1)^-20 = 1486.44 If you know about negative exponents you will ...
Monday, March 9, 2009 at 8:20pm by Reiny
Chemistry
I conducted a Gas Chromatography experiment using Flame Ionisation Detector (FID).A capillary column was used. 1)Blank 2) Standard 3) Sample 4)Blank 5)Standard The above was injected into the system. In 2)Standard chromatogram,a sharp, thin peak was observed between the 2 ...
Saturday, February 18, 2012 at 8:11pm by mandy
statistics
You can formally write down everything in terms of the probability distribution function. Let's say the population consists of N elements and each element can be in some state denoted by a continuous variable x distributed according to the same probability density p(x). If...
Thursday, February 21, 2008 at 5:25pm by Count Iblis
algebra 2
The monthly rents for the apartments in a building are listed below. $425, $550, $550, $550, $650, $650, $650, $650, $800, $900 Part A: Find the mean, median, mode, range, and standard deviation of the rents. Part B: The apartment manager considers raising the rent for every ...
Wednesday, May 23, 2012 at 11:55pm by jenny
statistics
I. 71. The mode, by definition is the answer that appears most frequently. II. The midrange is 64, which is by definition the arithmetic mean of the largest and the smallest values in a sample or other group. The range is 55. Let H = highest score, and L = lowest score. Then...
Sunday, January 27, 2013 at 6:44pm by Jennifer
Chemistry
For the reaction, 2SO2(g) + O2(g) ¨ 2SO3(g) + heat, at equilibrium, what will be the effect on the net amount of SO3 present if the temperature of the container is increased? A) The concentration of SO3 decreases. B) The concentration of SO3 increases. C) The ...
Friday, March 12, 2010 at 7:12pm by Natalie
Statistics
If you use a one-sample z-test, here is the formula: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) With your data: z = (132.3 - 128)/(15/√50) = ? Finish the calculation. Check a z-table at 0.05 level of ...
Tuesday, April 16, 2013 at 6:18pm by MathGuru
standard deviation
the std dev is √4.4 = 2.1
Monday, February 11, 2013 at 9:45am by Steve
statistics
Values are: mean = 0 and standard deviation = 1.
Saturday, February 4, 2012 at 2:46pm by MathGuru
statistics
the answer is the standard deviation is 6 but i dont know how to get that
Tuesday, January 31, 2012 at 10:42pm by Josh
Statistics
z = (x - mean)/standard deviation find x
Wednesday, June 8, 2011 at 8:05pm by TutorCat
math
what is the standard deviation of these numbers 7 9 7 10 8 7 9
Monday, January 24, 2011 at 4:25pm by keke
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