Thursday

April 2, 2015

April 2, 2015

Number of results: 22,039

**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**

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**

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*

**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*

**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*

**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 â€” 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**

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*

**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**

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*

**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**

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 student’s deviation from the mean?
*December 8, 2011 by violet*

**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**

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*

**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*

**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*

**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 *

**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**

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*

**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*

**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*

**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*

**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 *

**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*

**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*

**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*

**statistics**

The human resources department of an engineering company gives IQ tests to a randomly selected group of new hires every year. They claimed that the mean IQ score of new hires, , from this year is greater than or equal to the mean IQ score of new hires, , from last year. This ...
*August 3, 2014 by Brittany*

**Statistics**

The distribution of heights of adult American men is approximately normal with a mean of 68 inches and a standard deviation of 2 inches. What percent of mean are at least 72 inches tall?
*July 4, 2013 by Anonymous*

**statistics**

at a bank, account balances are nomrally distribued with a mean of $637.52 and standard deviation of $623.16. What is the probability that a simple randon same of 400 accounts has mean that exceeds $1650.00? show me steps and calculations i urgently need help
*January 23, 2008 by son*

**stastics**

A recent article in a computer magazine suggested that the mean time to fully learn a new software program is 40 hours. A sample of 100 first-time users of a new statistics program revealed the mean time to learn it was 39 hours with the standard deviation of 8 hours. At the 0...
*June 5, 2010 by slayer*

**statistics**

The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 20 people reveals the mean yearly consumption to be 72 gallons with a standard deviation of 15 gallons. What is the 99% confidence interval for the population mean?
*November 4, 2012 by Jelian*

**Statistics**

19. George got 70% on an economics exam where the mean was 55% and the variance was 9. If a professor wishes to change the distribution of marks so that they have a mean of 70% and a standard deviation of 5, what will George’s new mark be? a) 95% b) 85% c) 90% d) Over 100% The...
*October 23, 2010 by Rhea *

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