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statistics
A student was asked to compute the mean and standard deviation for the following sample of n _ 5 scores: 81, 87, 89, 86, and 87. To simplify the arithmetic, the student first subtracted 80 points from each score to obtain a new
asked by Liz on June 22, 2011 
Statistics
A population has a mean of 30 and a standard deviation of 5. a. If 5 points were added to every score in the population, what would be the new values for the mean and standard deviation? b. If every score in the population
asked by Nickie on January 26, 2013 
math
The standard deviation of a sample taken from population A is 17.6 for a sample of 25. The standard deviation of a sample taken from population B is 21.2 for a sample of 30. The standard deviation of the sample mean differences
asked by j on July 15, 2015 
Statistics
A college statistics class conducted a survey of how students spend their money. They asked 25 students to estimate how much money they typically spend each week on fast food. They determined that the mean amount spent on fast
asked by sam on October 14, 2016

Math
Describe a scenario where you expect a set of data to have A.) a large standard deviation B.) a small standard deviation The prize for winning a contest can be chosen from category a or category b. Prizes from category a have a
asked by Jenny on June 19, 2016 
Statistics
1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they
asked by Anonymous on May 9, 2013 
statistics
IQ scores are normally distributed with a mean of 105 and a standard deviation of 18. Assume that many samples of size n are taken form a large population of people and the mean IQ score is computed for each sample. If the sample
asked by kimberly on September 13, 2012 
psychology
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 ?.
asked by net on February 13, 2011

Math
The mean of a sample of 25 was calculated as xbar = 500. The sample was randomly drawn from a population whose standard deviation is 15. Estimate the population mean with 99% confidence. B.) Repeat part (a) changing the population
asked by Joe on April 27, 2010 
Math (Statistic)
Considered the sampling distribution of a sample mean obtained by random sampling from an infinite population. This population has a distribution that is highly skewed toward the larger values. a) How is the mean of the sampling
asked by Jennifer on February 19, 2007 
statistics
A researcher administered a treatment to a sample of participants selected from a population of 80. If the researcher obtains a sample mean of M=88. Which combination of factors is most likely to result in rejecting the null
asked by Robbie on November 9, 2012 
Maths
Statistics The marks scored by a sample of 56 students are summarised by: N=56 Sum of x =3026 sum of(xthe mean)^2 =15378 A) calculate the mean and the standard deviation Mean I got  54.04 (2.dp) Standard deviation I got  16.72
asked by Anonymous on November 15, 2015
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