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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
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A researcher found a sample proportion of 0.94 for estimating the population proportion of freshmen at a university who had Facebook accounts. If the standard deviation of the sampling distribution of the sampling proportion is
asked by Mary on May 18, 2012 
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Use a calculator to find the mean and standard deviation of the data. Round to the nearest tenth. 6,7,19,7,18,7 A. mean = 9; standard deviation = 26.4 B. mean = 11.9; standard deviation = 26.4 C. mean = 10.6; standard deviation =
asked by Veronika on February 18, 2016 
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3. In a sample of 64 students given an examination in statistics, it is found that the mean weight is 57 kg with standard deviation 9 kg. Find : ƒÜ i) The proportion of students weight 4862 kg. ƒÜ ii) The proportion of those
asked by suhad on February 22, 2013 
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suppose that 80% of all 18 year olds play basketball. if a sample size of 4 is taken, find the probability that the sample proportion lies within and including one standard deviation of the population proportion
asked by Jay on October 14, 2016 
Statistics
1) A Motor Company has purchased steel parts from a supplier for several years and has found that 10% of the parts must be returned because they are defective. An order of 25 parts is received. What are the mean and standard
asked by BEARHUG on February 15, 2009 
Statistics
data from sample of 400 cases, variable has 95% confidence interval of 54.3 to 54.7 I found the mean how do i find standard error step by step please. Standard error = sd/√n Note: sd = standard deviation; n = sample size.
asked by Angel on April 10, 2007 
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A DVD rental store wants to know what proportion of its customers are under age 21. A simple random sample of 500 customers was taken, and 375 of them were under age 21. Presume that the true population proportion of customers
asked by Statistics on April 12, 2015 
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How can I find standard error from each of the following: a) a proportion & a sample size? b) mean, standard deviation, and sample size? c) mean & standard deviation? thank you
asked by Bridget on October 31, 2016 
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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 firsttime users of a new statistics program revealed the mean time to learn it was 39 hours
asked by slayer on June 5, 2010