If the variance of the four numbers a,b,c and d is 9, then the variance of the four numbers 14-a, 14-b, 14-c and 14-d is _? A. 5 B. 9 C. 23 D. 121

12,679 questions
1. Statistics

Which of these statements is not true about the variance in a binomial distribution B(n, p)? __________ A. For a fixed p, the variance increases as n increases. B. For a fixed n, the variance is maximum when p = 0.5. C. The variance depends only on n. D.

asked by Anonymous on March 24, 2012
2. A

When actual cost is more than planned __________________. (Points : 1) A a favorable variance is produced B an unfavorable variance is produced C no variance is produced D there is no way to calculate which way the variance will fall without more

3. math

How do I find a variance for a set of numbers {1,16,8,17,12} I got that variance-34.2, but I'm unsure. Any help? Thanks.

asked by April on January 24, 2010
4. Math

Two simple of sizes 8&10 are drawn from two normally distributed population having variance 20 and 36 respectively. Find the probality that the variance of the first sample is more than twice the variance of the second sample

asked by Jaya on January 19, 2016
5. maths

Q- Two samples of sizes 8 and 10 are drawn from two normally distributed population having variance 20 and 36 respectively. Find the probability that the variance of the first sample is more than twice the variance of the second sample.

6. statistics

Q- Two samples of sizes 8 and 10 are drawn from two normally distributed population having variance 20 and 36 respectively. Find the probability that the variance of the first sample is more than twice the variance of the second sample.

asked by Vivaan on January 2, 2016
7. statistics

450 people are randomly selected at grocery stores across the state and surveyed on the amount of money they are spending at the store that day. How does finding the sample variance compare to investigating the sampling distribution of the variance? A. The

asked by maczindahouse on February 20, 2019
8. ACCOUNTING

If the actual factory overhead applied is more than the actual factory overhead incurred _________. (Points : 1) A a favorable variance is produced B an unfavorable variance is produced C no variance is produced D there is no way to calculate which way the

9. Probability

Let T1,T2,…,Tn be i.i.d. observations, each drawn from a common normal distribution with mean zero. With probability 1/2 this normal distribution has variance 1, and with probability 1/2 it has variance 4. Based on the observed values t1,t2,…,tn, we

asked by Fiore on April 8, 2015
10. Probability

Let T1,T2,…,Tn be i.i.d. observations, each drawn from a common normal distribution with mean zero. With probability 1/2 this normal distribution has variance 1, and with probability 1/2 it has variance 4. Based on the observed values t1,t2,…,tn, we

asked by A on April 2, 2014
11. math

An organizational psychologist measures levels of job satisfaction in a sample of 30 participants. To measure the variance of job satisfaction, it is calculated that the SS = 120 for this sample. What are the degrees of freedom for the variance? Compute

12. accounting

Diamond Company produces a chair that requires 5 yds. of material per unit. The standard price of one yard of material is \$7.50. During the month, 8,500 chairs were manufactured, using 43,700 yards at a cost of \$7.60. Determine the (a) price variance, (b)

asked by melissa on June 29, 2008
13. accounting

Diamond Company produces a chair that requires 5 yds. of material per unit. The standard price of one yard of material is \$7.50. During the month, 8,500 chairs were manufactured, using 43,700 yards at a cost of \$7.60. Determine the (a) price variance, (b)

asked by MO on May 6, 2011
14. HELPP math

13,14,29,26,41,53,60,7,89,14 Based on the numbers above what is the variance and the standard deviation of the data set. I think 616.2 is the variance I think 24.83 is the standard deviation Am I correct????

asked by Chris on December 29, 2012
15. Statistics

To do inferential procedures comparing two proportions, we need another variance formula (our ruler). This formula is based on what principle? A) The variance of the difference of two statistics is the difference of the variances of each statistic. B) The

asked by Katie on November 15, 2013
16. Maths

If the variance of the four numbers a,b,c and d is 9, then the variance of the four numbers 14-a, 14-b, 14-c and 14-d is _? A. 5 B. 9 C. 23 D. 121

asked by MilyYang on May 8, 2014
17. accounting

Alpine Bicycle Company manufactures mountain bikes. The following data for May of the current year are available: Use the minus sign to enter favorable variances as negative numbers. a. Determine the direct labor rate variance and direct labor time

asked by Anonymous on November 5, 2011
18. elementary statistics

A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below). At 0.05 alpha level can it be

asked by David on November 30, 2013
19. elementary statistics

A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below). At 0.05 alpha level can it be

asked by David on November 30, 2013
20. Statistics

Hi, My professor gave us the formulas for sample variance and population variance, as well as the shortcut formulas for each. However, he said that on some of the problems, we will HAVE to use the long formula, which for population variance would be:

asked by Lila on October 11, 2010
21. Stats (Math)

Assume that Science scores on a 25-point quiz for a random sample of 5 students were drawn from a normal population. The assumed variance was 20 while the recorded variances were: 18, 16, 10, 13, and 23. You suspected that the variance is actually higher.

asked by Leeroy on May 10, 2015
22. accounting

please explain how a large variance from budget would you consider important to address on a monthly hospital variance report:5% 10% 25%

asked by Anonymous on May 19, 2010
23. math- Variance

What does it mean when it says Variance of Stride Length with Speed?? Do you add the Variance of both individually together?

asked by Emily on March 14, 2012

I am having problems understanding cost variance model; Can you give me a simplyfied formula to determine budgetary variance models? I have an example.

asked by Brenda on July 22, 2012
25. Math Statistics

In general, what is the relationship between the standard deviation and variance? a. Standard deviation equals the squared variance. b. Variance is the square root of standard deviation. c. Standard deviation is the square root of variance. d. These two

asked by Misty on September 29, 2012
26. Consumer math

Complete the chart to find the mean, variance and standard deviation. Remember to use commas and round numbers to the nearest tenth. X _ X _ X - X _ (X - X)2 1. 900 = 466.2 = The mean is 2. 35 = -398.8 = 159,041.4 The median is 3. 500 = 66.2 = The variance

asked by yamilex on December 11, 2012
27. college math

20. Calculate the range, variance, and standard deviation of the following data set: 5, 5, 6, 6, 6, 8, 8, 8, 8, 10, 10, 11, 12, 12, 20 (Points: 5) Range = 15; Variance = 225; Standard Deviation = 7.5 Range = 3.85; Variance = 14; Standard Deviation = 3.74

asked by Anonymous on November 7, 2011
28. Statistics

Suppose that the fit to the simple linear regression of Y on X from 6 observations produces the following residuals: -3.3, 2.1, -4.0, -1.5, 5.1, 1.6. a) What is the estimate of sigma squared? b) What is the estimate of sigma? c) What are the degrees of

asked by MMK on March 14, 2007
29. stats

Consider an infinite population with 25% of the elements having the value 1, 25% the value 2, 25% the value 3, and 25% the value 4. If X is the value of a randomly selected item, then X is a discrete random variable whose possible values are 1, 2, 3, and

asked by Mischa on November 5, 2008
30. math

Using the data in the table, calculate the mean, range, variance, and standard deviation, and then answer questions e and f. Round the variance and standard deviation to one decimal place. a. Mean b. Range c. Variance d. Standard deviation e. What value is

asked by Anonymous on November 10, 2013
31. statistic

The variance in a production process is an important measure of the quality of the process. A large variance often signals an opportunity for improvement in the process by finding ways to reduce the process variance. Conduct a statistical test to determine

asked by yanti on December 18, 2011
32. reiny

How do I find a variance for a set of numbers {1,16,8,17,12} I got that variance-34.2, but I'm unsure. Any help? Thanks. math - Reiny, Sunday, January 24, 2010 at 8:16pm look at his page. Reiny - April, Sunday, January 24, 2010 at 8:25pm I looked at that

asked by April on January 24, 2010
33. statistik and probability

Two samples of sizes 8 and 10 are drawn from two normally distributed populations having variances 21.8 and 36, respectively. Find the probability that the variance of the first sample is more than twice the variance of the second sample. Interpret its

asked by Anonymous on January 10, 2015
34. Stats

Dee's store monthly sales for April, May, June are three independent random variables with means and variances as follow: April: Mean: \$9500 Variance: \$1250 May: Mean: \$7400 Variance: \$1425 June: Mean: \$8600 Variance: \$1610 a) find the mean and standard

asked by Dee on November 3, 2006
35. Statistics

Which analysis of variance should be applied when an experiment has more than one independent variable. What are the assumptions and limitations of the analysis of variance in comparison with the t test including post hoc tests.

asked by Charles on October 16, 2009
36. test and measures

If the true score variance is equal to 10 and error variance is equal to 2, what is our estimate of reliability? [Hint: Think about the conclusions that we draw from the assumptions of classical test theory]

asked by sharon on June 5, 2014
37. Statistics

Consider a study in which the population variance estimate based on treatment group of 14 participants is 8, and the population variance estimate based on a control group of 17 individuals is 9. Compute the pooled estimate of population variance. - 7.25 -

asked by Trey on October 11, 2009
38. statistics

Consider a study in which the population variance estimate based on treatment group of 14 participants is 8, and the population variance estimate based on a control group of 17 individuals is 9. Compute the pooled estimate of population variance.

asked by liz on May 31, 2010
39. Statistics

What significance does variance have to a set of data? is variance the same as coefficent of variation? when using coefficient of skewness, if you have a +1 or -1 value it signifies a high degree of skew. So does that refer to a postive/ negative skew or

asked by Anique on March 8, 2012
40. statistics

Which analysis of variance should be applied when an experiment has more than one independent variable. What are the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc tests.

asked by John on October 14, 2009
41. managerial accounting

Tusk pty ltd uses standard costs system for its single product in which variable manufacturing overheads is applied on the basis of direct labour hours. The following information is given: Standard costs: Raw material[R16per kg] Per unit R 24.00 Direct

asked by steve on February 12, 2010
42. Statistics

In an analysis of variance, if the null hypothesis is true then: - The research hypothesis is also true -You will need fewer participants for the experiment - There is less variance among the sample means than if the null hypothesis was not true - The

asked by Trey on October 11, 2009
43. Statistics

A study of generator related carbon monoxide deaths showed that a sample of 6 recent years had a variance of 16.8 deaths per year. Find the 99% confidence interval of the true variance

asked by Elise on August 10, 2013
44. analysis of variance

which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc tests

asked by smith on December 15, 2010
45. Math

A study of generator related carbon monoxide deaths showed that a sample of 6 recent years had a variance of 16.8 deaths per year. Find the 99% confidence interval of the true variance

asked by Elise on August 10, 2013
46. analysis variance

which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc tests

asked by wallic on December 21, 2010
47. Econ check my work

Consider the following data: 23 17 20 29 21 14 19 24 Develop and test a hypothesis to determine if the variance is greater than 4. Use the critical value approach and α = 0.05. So I did my work and the variance I calculated is 18.3593 which is greater

asked by Anonymous on February 7, 2018
48. Maths: Probability Distrubution

Consider an arrival process whose interarrival times are independent exponential random variables with mean 2 (and consequently variance equal to 4), and consider the inter arrival interval IS seen by an observer who arrives at a fixed time t*, What is the

asked by Fin on December 3, 2018
49. math

Using the data in the table, calculate the mean, range, variance, and standard deviation, and then answer questions e and f. Round the variance and standard deviation to one decimal place. a. Mean b. Range c. Variance d. Standard deviation e. What value is

asked by Anonymous on November 8, 2013
50. math

Using the data in the table, calculate the mean, range, variance, and standard deviation, and then answer questions e and f. Round the variance and standard deviation to one decimal place. a. Mean b. Range c. Variance d. Standard deviation e. What value is

asked by Anonymous on November 8, 2013
51. probability

Consider an arrival process whose interarrival times are independent exponential random variables with mean 2 (and consequently variance equal to 4), and consider the interarrival interval S seen by an observer who arrives at a fixed time t∗, as in the

asked by David on November 27, 2018
52. statistics

Let X be the average of a sample of size 25 independent normal random variables with mean 0 and variance 1. P[[X

asked by zwesko on November 23, 2011
53. ALGEBRA

Find the range and the variance (correct to one decimal place). 77, 92, 93, 93, 98 (b) Find the variance = I had the range correct except the variance.

54. math

two sample of size 8 and 10 are drawn from two normally distributed populations having variances 20 and 36, respectively. find the probability that the variance of the first sample is more than twice the variance of the second sample.

asked by rani singh on August 20, 2016
55. statictics

According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test? Answer a. 0.40 b. 0.50 c. 0.80 d. 0.90

asked by Joyce on October 27, 2013
56. Statistics

The grades in the final exam of a random sample of 25 students produce a standard deviation, s = 9.5. a) Construct a 90% confidence interval estimate for the population variance, . b) Can we infer at 10% level of significance that the population variance

asked by Kendra on November 25, 2014
57. managerial Accounting

Smith Co uses a standard cost system for its single product in which variable manufacturing overhead is applied on the basis of direct labor hours. The following information is given: 4 Standard costs per unit: Raw materials (1.5 grams at \$16) \$24.00

asked by Klatoyaa on September 30, 2010
58. intro to probability

For the sheet-metal stamping machine in a certain factory, the time between failures, X1 has a mean between the failures, of 56 hours and a variance of 16 hours. The prepair time X2, has a mean time to repair of 5 hours and a variance of 4 hours. a) If X1

asked by amelie on April 20, 2008
59. health care

you are a manager of a variable hospital department and you just received your monthly budget results that state that your salaries were higher and your supplies were lower than budgeted. Explain what factors you should consider when writing your variance

asked by betty on August 20, 2010
60. Accounting

Calculate variable cost variances—explain results The standards for one case of Springfever Tonic are: Direct materials . . . . . . . . . . . . . . . . . . 8 lbs. @ \$3.00/lb. = \$24 Direct labor . . . . . . . . . . . . . . . . . . . . . 6 hrs. @ \$1

asked by Jasmine on September 20, 2012
61. Statistics

In a certain population the heights of men are normally distributed with mean 168.75 and variance 42.25 those of women are normally distributed with mean 162.50 and variance 36 the probability that the mean height of a random sample of 25 men is less than

asked by Malambo on April 13, 2017
62. statistic/Psychology

According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test? a. 0.40 b. 0.50 c. 0.80 d. 0.90

asked by Crystal on July 26, 2013
63. reliabiility

According to classical test theory, if the observed variance of a test is 50 and the true variance is 40, what is the estimated reliability of the test

asked by Stephanie on April 22, 2017
64. statistic/Psychology

According to classical test theory if the observed variance of a test is 50 and the true variance is 40 what is the estimated reliability of the test? a. 0.40 b. 0.50 c.0.80 d. 0.90

asked by Crystal on July 27, 2013
65. Statistics

S2Within" equals: - the sum of squares within each group - the square root of the standard within-group deviations from the mean - the squared variance within groups - the population variance estimate based on the variation within each of the groups.

asked by Trey on October 11, 2009
66. Probabilities

Can someone help me work this out. Find the a) mean, b)variance and c) standard deviation for the probability distribution below K Pr(X=k) 0 0.4 1 0.2 2 0.3 3 0.1 For mean I came up with 1.1 0(0.4)+1(0.2)+2(0.3)+3(0.1) For variance I came up with 1.09

asked by Debra on July 9, 2015
67. Statistics

Suppose you have a sample of 6 observations from a normal population. The sample variance is equal to 4. Find a 90% lower confidence interval for the variance of the population.

asked by Chase on July 11, 2015
68. probability

Consider three lightbulbs each of which has a lifetime that is an independent exponential random variable with parameter λ=1. The variance of the time until all three burn out is: = Recall that the variance of an exponential with parameter λ is 1/λ2.

asked by Chris on November 27, 2018
69. Accounting

In the table given below, reconstruct the remaining information using the available data. [ WHERE THE X's ARE] All of the raw material purchased during the period was used in production. (Indicate the effect of each variance by selecting "Favorable" or

asked by Sara on November 17, 2015
70. Statistics

Cholesterol levels of adult males are approximately normally distributed with a mean of mg/dL and a listed variance of . Some researchers claim that the variance of cholesterol levels of adult males is less than . Suppose that we want to carry out a

asked by Michelle on April 29, 2011

47. Idol Company has developed standards for the materials required to produce a single unit of Model IWIN: 25 pounds of Supreme at \$130.00 per pound Last month, Idol purchased 490,000 pounds of Supreme at a total cost of \$61,250,000. Idol used 482,000

asked by chunky on February 20, 2012
72. managerial accounting

The following direct materials and direct labor data pertain to the operations of Solario Manufacturing Company for the month of August Costs Quantities Actual labor rate \$13 per hour Actual hours incurred and used 4,200 hours Actual materials price \$128

asked by jennifer on November 15, 2010
73. Quantitative Analysis

In ANOVA, the "error variance" is typically reflected in...? A. Between group differences B. Between group variances C. Within group variance D. Within group associations

asked by Stacie on November 5, 2013
74. Statistics

The table below shows the LOS for a sample of 11 discharged patients. Using the data in the table, calculate the mean, range, variance, and standard deviation, and then answer questions e and f. Round the variance and standard deviation to one decimal

asked by Anonymous 11/9/13 on November 9, 2013
75. statistics

what is the variance and standard deviation of the following numbers:14,16,26,36,12,16

asked by Hunter on April 30, 2014

The mean of a set of numbers 1,y,1,2y+2,13 and 16 is 9. Find the value of y and the variance.

asked by Michele on January 2, 2017
77. Maths

Find the mean and variance of the first n natural numbers.

asked by Gash on January 30, 2019
78. Math

I am doing estimating Standard deviation of grouped data. I have done all the sum freg 60/ midpoint 2580/ x bar is 43 for all/ and total with x bar is 10260. Can you explain how to get the variance and sq root from these. I know that you have to

asked by Mary Ann on July 26, 2015
79. Statistics

The table below shows the LOS for a sample of 11 discharged patients. Using the data in the table, calculate the mean, range, variance, and standard deviation, and then answer questions e and f. Round the variance and standard deviation to one decimal

asked by Anonymous 11/11/13 on November 11, 2013
80. Quantum Physics

The variance σ2X=⟨(X^−⟨X^⟩)2⟩ of an operator, X^, is a measure of how large a range its possible values are spread over (the standard deviation is given by σ=σ2−−√). Suppose that |X⟩ is an eigenstate of some operator X^, what is the

asked by sonia on October 21, 2013
81. math

20 students, a score of 10 indicates depression, a score of 0 indicates no depression, variation is unknown, but sample of 20 has a mean score of 4.4, unbiased estimate of population variance is 15. What is the variance of the distribution of means?

asked by Anonymous on January 14, 2010
82. statistics

what is the variance and standard deviation for the group of numbers: 28 27 48 52 77 29 30 31 60

asked by Barbara on March 4, 2011
83. math

What six numbers can you use that will give you a variance of 4 and a standard deviation of 2?

asked by Anonymous on August 9, 2011
84. Managerial Accounting

Determining and interpreting flexible budget variances Use the standard price and cost data supplied in problem 15-18. Assume that Holligan actually produced and sold 31,000 books. The actual sales price and costs incurred follow. Actual price and variable

asked by Kevin on April 5, 2011
85. statistics

A transportation company wants to estimate the variance of the length of time goods are in transit across the country. A random sample of 20 shipments gives days and day. Give a 95% confidence interval for the variance of the transit time for all goods.

asked by ak on May 17, 2010
86. statistics

Can someone help me with this questions. Find the variance for a given data. Rpund your answer to one more decimal place then the original data. Compute the variance. Jeanne is currently taking college zoology. The instructor often gives quizzes. On the

asked by natalie on August 28, 2007
87. Statistics

Exam Grades. A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below.) At á = 0.05, can it be

asked by Gabriela on April 17, 2013
88. math

calculste the variance of this set of numbers 2, 2, o, 3, 1, 4, 1, 3, 0, 0, 1, 4 4, 0, 4, 3, 4, 2, 1, 0, and the standard devative

asked by Dianne on October 30, 2010
89. Statistics

You are interested in estimating the mean of a population. you plan to take a random sample from the population and use the samples mean as an estimate of population mean. Assuming that the population from which you select your sample is normal, which of

asked by Winston on October 25, 2016
90. Statistics (random variable)

A contractor is interested in the total cost of a project on which he intends to bid. He estimates that materials will cost rs 25,000 and that his labour will be rs900 per day. If he the project takes X days to complete,the total cost of the project (in

asked by pallavi on June 5, 2012
91. Intro to probability

Two balanced coins are tossed. What are the expected value and the variance of the number of heads observed? ================================== I'm confused on how to start. I don't know how many times im suppose to toss coin, and how to set up my table

asked by amelie on February 23, 2008
92. statistics

the following data represents the percentages of family income allocated to groceries for a sample of 50 shoppers: percentage of family income #of shoppers 10-19 6 20-29 14 30-39 16 40-49 11 50-59 3 1.calculate the value of mean 1.1 meadian percentage of

asked by mary on April 27, 2007
93. Math

Given 15 data items: 11, 15, 13, 16, 8, 8, 9, 10, 11, 4, 9, 6, 8, 3, 17 Calculate the: range variance standard deviation first quartile second quartile (median) third quartile My answers are: 1. Range :14 2. Variance: 15.7 3. 3.96 4. 8 5. 9 6. 13 I just

asked by Kim on November 5, 2013
94. Health Finance

Question Details Consider the following 2007 data for Newark General Hospital (in millions of dollars): Static Flexible Actual Budget Budget Results Revenues \$4.7 \$4.8 \$4.5 Costs 4.1 4.1 4.2 Pro?ts 0.6 0.7 0.3 a. Calculate and interpret the pro?t variance.

asked by molamidi on January 26, 2012
95. 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

asked by Flower on September 10, 2010
96. statistics

A psychologist wants to estimate the variance of employee test scores. A random sample of 18 scores had a sample standard deviation 10.4. Find a 90% confidence 2 interval for the population variance. What assumption, if any, have you made in calculating

asked by Janelle on November 9, 2011
97. Please tell me if i did this correct

Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work. Errors Frequency 51-53 9 54-56 19 57-59 16 60-62 24 63-65 25 This is what I got: Mean = 59.19 Variance = 1.43 Standard Deviation =

asked by Jennifer on October 16, 2011
98. stats

Eating raw fish (and enjoying it) is an acquired taste for many people who have never tried sushi. Ten people who had never before eaten sushi were asked to rate how much they liked it on a 100-point scale (100=fantastic, 0=yuck) on each of four occasions

asked by blah on June 14, 2006
99. Managerial Accounting

Direct materials: 7 microns per toy at \$0.32 per micron Direct labor: 1.2 hours per toy at \$6.80 per hour During July, the company produced 4,600 Maze toys. Production data for the month on the toy follow: Direct materials: 70,000 microns were purchased at

asked by Kat on July 31, 2015
100. Statistics

Suppose X1;X2;...;X5 is a random sample from a n(0; variance) distribution. define U = X1+X2+X3+X4; V = (X2)^2+(X3)^2+(X4)^2+(X5)^2 and W = U/sqrtV. (a) Name the distribution of U/4 and V/(variance) and give the values of their parameters. (b) (i) Compute

asked by ruth on August 10, 2006