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August 3, 2015

Search: statistics/mean and standard deviation

Number of results: 22,615

statistics
question- a packaging device is set to fill detergent powder packets with a mean weight of 5 kg .the standered deviation is known to be 0.01kg.these are known to drift upward over a period of time due to machine fault,which is not tolerable.a random sample of 100 packets is ...
October 29, 2010 by sunil

statistic
1. A distribution has a standard deviation of   12. Find the z-score for each of the following locations in the distribution. a. Above the mean by 3 points. b. Above the mean by 12 points. c. Below the mean by 24 points. d. Below the mean by 18 points. For the following ...
January 26, 2013 by Nickie

Statistics
New data is added to change the mean time to 6 mninutes and 10 seconds with standared deviation 2 minutes and 5 seconds. The mean depth is now 115.5 feet with standard deviation 31.6 feet. If the association is still negative and r^2=.68, find the slope of the regression line ...
March 7, 2012 by Shayla

Statistics
The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.9 grams per mile and standard deviation 0.15 grams per mile . (a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile ?
January 12, 2012 by Terra

Statistics
find the 90% confidence interval for the variance and standard deviation of a sample of 16 and a standard deviation of 2.1 Assume the variable is normally distributed.
October 24, 2010 by Anon

Statistics
How do you figure this out? For a population that has a standard deviation of 10, what is the standard deviation of the distribution of means for samples of size 2? A-6.33 B-7.07 C-2 D-3.03
May 7, 2010 by Amanda

statistic
Let's assume there are 3 people in Room A and another 3 people in Room B. The ages of the people in Room A are 25, 25, and 25. The ages of the people in Room B are: 10, 25, and 40. The mean of the ages in both rooms is 25. Does that mean that both room have populations that ...
May 12, 2010 by carol

statistics
IQ scores distribution of IQ scores is not normally distributed standard with a mean of 100 and a standard deviation of 15, which is represented by a bell-shaped graphical. What is the area under the curve? What is the median? What is the mode?
April 25, 2015 by norma

statistics
IQ scores distribution of IQ scores is normally distributed standard with a mean of 100 and a standard deviation of 15, which is represented by a bell-shaped graphical. What is the area under the curve? What is the median? What is the mode?
April 25, 2015 by norma

STATISTICS
IQ scores distribution of IQ scores is normally distributed standard with a mean of 100 and a standard deviation of 15, which is represented by a bell-shaped graphical. What is the area under the curve? What is the median? What is the mode?
April 25, 2015 by norma

Statistics
What is the mean and standard deviation of 63.7%? What is the mean and standard deviation of 61.4%? Using the 68-95-99.7 rule, describe the sampling distribution of 63.7% Using the 68-95-99.7 rule, describe the sampling distribution of 61.4%? Please help I am so lost...
October 16, 2013 by Lisa

Statistics
What is the mean and standard deviation of 63.7%? What is the mean and standard deviation of 61.4%? Using the 68-95-99.7 rule, describe the sampling distribution of 63.7% Using the 68-95-99.7 rule, describe the sampling distribution of 61.4%? Please help I am so lost...
October 17, 2013 by Lisa

Algebra
A supervisor finds the mean number of miles that the employees in a 9the x has a line on top)department live from work. He finds X=2.9 and s=3. Which statement must be true? z376 is within 1 standard deviation of the mean. z37 is between 1 and 2 standard deviations of the mean...
July 18, 2014 by Junior

Psychology/Statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size - 3. Use the formula sqrt(N^ 2/S)
July 15, 2011 by Dawn

statistics
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 50 students who took the exam is selected for study: A) What is the shape, mean, and ...
November 6, 2008 by Marshall

Statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size 3.
November 15, 2010 by Barbara

Statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.
November 19, 2010 by Felicia

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size 3
January 10, 2011 by melissa

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.
January 24, 2011 by kim

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.
January 30, 2011 by Anonymous

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size - (b) 3 ?.
February 13, 2011 by net

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3
April 4, 2011 by amanda

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.
April 10, 2011 by mama

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.
May 12, 2011 by Mae

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.
June 13, 2011 by hope

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size 3.
June 14, 2011 by Reba

Statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size: 3
July 4, 2011 by Christy

statistics
For a population that has a standard deviation of q0, figure the standard deviation of the distribution of means for samples of size-(a)2,(b)3,(c)4,(d)9.
July 6, 2011 by Dorothy

Math
Can someone explain what to do for the following question. What percentage of a normal distribution is greater than the mean? Give your answer correct to the nearest percent. What formula is used? Because I have to find also 1 standard deviation of the mean and what percentage...
May 22, 2013 by Sue

Statistics
A driving machine was employed to hit a sample of 41 each of two different brands of golf balls using the same force each time. The research team measured the distance between the point of impact and where the ball eventually came to rest on the ground. Results are show below...
June 21, 2010 by Randi

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 ...
October 11, 2010 by mary

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.
November 3, 2009 by Ashley

statistics
Given a data set with the mean = 44 and the standard deviation = 15, what is the value of the Third Quartile?
September 10, 2010 by angie

statistics
Sample size is 24, Mean rate of 6.50%, Standard Deviation is 1.20. Calculate 90% of confidence interval
October 14, 2010 by sue

statistics
what percentage of students studied between 30 and 40 hours? Range 10-50, Mean- 35, standard deviation-5.
October 14, 2010 by kim

statistics
with a mean of 62 and standard deviation of 12, how would you find a proportion greater than 80 and draw it on a curve?
December 2, 2010 by kaitlyn

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?
January 4, 2011 by Alana

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?
January 4, 2011 by Casey

statistics
in a distribution of scores with a mean of 1500 and a standard deviation of 250, what is the 95th percentile?
February 26, 2011 by Ruben

statistics
Make up 20 hypothetical scores. Determine their mean, median, mode, and standard deviation.
June 24, 2011 by Janet

statistics
Assuming that the data are normally distributed with a mean of 45 and a standard deviation of 3.25, what is the z-score for a value of 40?
October 20, 2011 by Dean

statistics
we have a normal distribution with mean 76 and standard deviation 6.4, find the percent between 69.6 & 76?
November 8, 2011 by laura

statistics
A random sample of size 36 is taken from a population with mean 50 and standard deviation 5. Find P( < 51.5).
July 6, 2012 by dave

Criminology Statistics
A given distribution has a mean of 60. A score of 75 had a corresponding z of +2.00. The standard deviation is
March 1, 2013 by Mariah

statistics
A random sample of 100 of a population Mean is 31 and standard deviation 22 Approximate probability of 28
April 27, 2013 by Dorri

statistics
population with a mean of 110 and a standard deviation of 6, what is the likelihood of a score of 100 or lower
July 4, 2013 by carole

statistics
You have an observation of 55, a population mean of 48, and a standard deviation of 1.85. Therefore, the z-score would be:
February 10, 2014 by Anonymous

Statistics
A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?
November 9, 2014 by Terri

statistics
A specific study found that the average number of doctor visits per year for people over 55 is 8 with a standard deviation of 2. Assume that the variable is normally distributed. 1. Identify the population mean. 2. Identify the population standard deviation. 3. Suppose a ...
April 15, 2013 by Cam

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 ‚ÄĒ scores given in terms of...
July 22, 2005 by GetYourLeash

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. Find the ...
February 8, 2011 by Tammy

statistics
population mean=42.6 standard deviation=12 n=16 M=34.4. Is this mean a reasonable outcome for a sample of n=16, or is this sample mean very different from what would usually be expected? I obtained a z -score of -2.73. Thus, that would make the sample mean a reasonless outcome...
May 29, 2008 by Lindy

statistics
. For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...
October 29, 2014 by Anonymous

statistics
For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...
October 30, 2014 by Anonymous

Statistics
Thirty random students took a calc test. If the sample mean was 90 & the standard deviation was 13.9, construct a 99% confidence interval for the mean score of all students. Is the answer 83.03 to 96.97??
September 14, 2008 by Shannon

Statistics
Suppose that a sample of size 58 is drawn from a population with mean 23 and standard deviation 80. Find the value of , the mean of the distribution of sample means. Wrtie only a number as your answer.
June 20, 2013 by Anonymous

statistics
An IQ is designed so that the mean is 100 and the standard deviation is 23 for the population of Normal adults, find the sample size necessary to estimate the mean IQ score of statistics students Such that it can be said with 90% confidence that the sample mean is within 5 IQ ...
May 19, 2014 by joe

Statistics
A sample of 148 values is randomly selected from a population with mean, μ, equal to 46 and standard deviation, σ, equal to 17. (Give your answers correct to one decimal place.) (a) Determine the interval (smallest value to largest value) within which you would ...
November 23, 2014 by Dakota

math
find the standard deviation for the following: 8,5, 12, 8, 9, 15, 21, 16, 3. There is a formula but our teacher wants us to do it a specific way. For example, 47, 41, 32, 53, 57. First you find the mean, which is 46 and then subtract it with each number in the set so you get 1...
December 8, 2013 by sarah

statistics
for a distribution standard deviation=10.If every item is increased by 2 then what will new standard deviation?
September 27, 2011 by Anonymous

statistics
for a distribution standard deviation=10.If every item is increased by 2 then what will new standard deviation?
September 27, 2011 by ria

statistics
A student scores 600 on a SAT test. If the population mean of the test scores is 510 and the population standard deviation is 106 point, what is the studentís deviation from the mean?
December 8, 2011 by violet

statistics
a research participant has her brain scanned while listening to music and solving math problems, and the brain area of interest has a percent signal change of 58. From many previous studies with this same math-problems procedure (but not listening to music), it is known that ...
January 13, 2012 by Anonymous

Math
On a standardized test, Phyllis scored 84, exactly one standard deviation about the mean. If the standard deviation for the test is 6, what is the mean score for the test?
October 22, 2012 by Tanyetta

Statistics
The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, their average ...
February 25, 2014 by Ray

Statistics
The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, their average ...
February 25, 2014 by Ray

Statistics
The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, their average ...
February 25, 2014 by PLEASE HELP!!!!!!!!!

math
A district mathematics test for all third graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of the third graders tested scored with +1 and -1 standard deviation of the mean?
July 5, 2013 by Anonymous

QNT/351
Describe a business situation, other than what has already been selected by fellow students or selected from the team assignment, where mean and standard deviation can be used in decision making. Describe how calculation of mean and standard deviation can help in making a ...
November 26, 2013 by Karen

adult education
The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 290 hours and a standard deviation of 6 hours. What percentage of the bulbs have lifetimes that lie within 1 standard deviation to either side of the mean?
May 23, 2009 by sally

Math
Would you rather take an exam that typically has an mean of 80 with a standard deviation of 3 or an exam with a mean of 80 with a standard deviation of 15? why?
December 2, 2010 by Rena

Math
Would you rather take an exam that typically has an mean of 80 with a standard deviation of 3 or an exam with a mean of 80 with a standard deviation of 15? why?
December 3, 2010 by Rena

statistics
it is stated that the standard deviation sample of the is 7.6 (n = 26). Test the claim to a significance level of 0.10 that the population standard deviation was greater than 7.0. Round all answers to 3 decimal places.
July 28, 2012 by geety

statistics
it is stated that the standard deviation sample of the is 7.6 (n = 26). Test the claim to a significance level of 0.10 that the population standard deviation was greater than 7.0. Round all answers to 3 decimal places.
July 28, 2012 by geety

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.
July 17, 2012 by Christie

Math
if a test given to 100 people have a mean of 3.5 and a standard deviation is .5, what is the standard deviation of someone who scores 1.5>
April 8, 2009 by Debra

math
if a test given to 100 people have a mean of 3.5 and a standard deviation is .5, what is the standard deviation of someone who scores 1.5?
April 8, 2009 by Debra

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 ...
March 1, 2011 by Yesenia

Data and statistics
If a student had a z score of 2.5 for IQ, whar is his actual IQ? The IQ mean is 100, and standard deviation is 15.
July 22, 2010 by Beverly

business statistics
solv the following a)mean b)mode c)median d)standard deviation observation Frequency 5 14 10 22 15 47 20 17
November 29, 2010 by Anonymous

Statistics
X is normally distributed with a mean of 250 and a standard deviation of 40. What value of X does only the top 15% exceed?
September 16, 2011 by Joi

statistics
Suppose that is normally distributed with mean 90 and standard deviation 12. What value of does only the top 20% exceed?
September 19, 2011 by sarah

statistics
For a distribution in which the mean is 100 and the standard deviation is 12, find the following: the percentile of a score of 106.
September 30, 2011 by Jennifer

statistics
Assuming that the data are normally distributed with a mean of 45 and a standard deviation of 3.25, what is the z-score for a value of 40? (Points : 6) 1.54 2.38 -1.36 -1.54
October 19, 2011 by Anonymous

statistics
Given a normally distributed population of values with a mean of 76 and a standard deviation of 10 what is the probability that a value is 71 and 82
September 9, 2014 by bono

statistics
Suppose that the ages of students at a particular university average 26 years with a standard deviation of 2.8 years. Consider the sampling distribution of the sample mean age of students in a sample of n = 49. The standard deviation of the sampling distribution is
November 5, 2014 by Anonymous

econ
12) Suppose you know that the standard deviation of a variable is 10, and you have 100 observations, the standard deviation of the mean is
November 27, 2011 by Alyson

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 ...
June 28, 2010 by STatistic

Statistics/ is this how I do it.
Find the range and the standard deviation (correct to two decimal places). 83,96,100,100,103 find the range and standard deviation Do I that 5 numbers add that divide by 5 for the range I am not sure how to do standard deviation. Thank you
May 31, 2014 by Mary Ann

Statistics
The weights of the fish in a certain lake are normally distributed with a mean of 11 lb and a standard deviation of 6. If 4 fish are randomly selected, what is the probability that the mean weight will be between 8.6 and 14.6 lb? A) 0.0968 B) 0.4032 C) 0.3270 D) 0.6730
November 25, 2010 by Sarah

statistics
A researcher randomly selects 37 subjects and administers an attitude test regarding a product. Their mean is 22 and their standard deviation is 2.4. Construct the 90% confidence interval for the mean score of all such subjects
February 23, 2011 by mandy

statistics
A food manufacturer samples 7 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 14.2 oz and the sample standard deviation is 0.60 oz., find the 95% confidence interval of the true mean.
March 16, 2014 by Anonymous

stats please help ASAP!!!
A. The GPAs of all 5540 students enrolled at a University have an approximately normal distribution with a mean of 3.02 and a standard deviation of 0.29. Let x be the mean GPA of a random sample of 48 students selected from this University. Find the mean and standard deviation...
May 17, 2013 by DON

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%, ...
March 6, 2013 by Michelle

statistics
The population standard deviation (σ) for a standardized achievement test that is normally distributed is 8. † †a.) Calculate the standard error of the mean if you draw a random sample of†50 test scores.† Show your work for full credit .† .† . †b.) Your sample mean is ...
February 21, 2012 by PK

Statistics
Assume that the cure rate for a certain drug is 20% and that 15 patients are tested with this drug. Find the following: a) Mean b) Standard Deviation c) P (exactly 4 cures) d) P (exactly 4 cures) A snack company distributes chips in bags labeled 6 ounces. The local Bureau of ...
December 11, 2006 by Mary

Statistics
Lead (Pb) concentrations were measured in waterfowl eggshell samples from two locations. In n1 = 41 samples from a location downstream from a paper mill, the mean Pb concentration was 1 x = 0.13 ppm with a standard deviation of s1 = 0.04 ppm. In n2 = 31 samples from a location...
November 7, 2012 by Erik

Statistics
Lead (Pb) concentrations were measured in waterfowl eggshell samples from two locations. In n1 = 41 samples from a location downstream from a paper mill, the mean Pb concentration was 1 x = 0.13 ppm with a standard deviation of s1 = 0.04 ppm. In n2 = 31 samples from a location...
November 7, 2012 by Erik

statistics
A bus company official wanted to estimate the mean time for the trip between two cities. A random sample of such trips gave a mean of 152 minutes and a standard deviation of 12 minutes. Construct a 98% confidence interval for the population mean time.
July 9, 2011 by John

Statistics
Can any one help me with this? ThermoStar has been producing residential thermostats for over 50 years. Looking over the past 20 quarters (5 years) of the different product lines, the general manager has been trying to get a handle on sales, costs, and production, and has ...
August 20, 2009 by Trisha

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