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Statistics
To test H0: = 80 versus H1: < 80. a simple random sample of size n = 22 is obtained from a population that is known to be normally distributed. a) If ¯x = 76.9 and s = 8.5, compute the test statistic.
asked by Ted on April 25, 2013 
sssc
Suppose we test H0 : p = .3 versus Ha : p ≠ .3 and that a random sample of n = 100 gives a sample proportion p = .20. a: Test H0 versus Ha at the .01 level of significance by using critical values. What do you conclude? b: Find
asked by Anonymous on June 11, 2012 
Basic Statistics
A population of 300 voters contains 147 Republicans, 135 Democrats, and 18 independents and members of other parties. A simple random sample of 30 voters will be drawn from this population. Consider repeatedly drawing simple
asked by mike on July 24, 2011 
statistics
Which of the following criteria must be met to do a onesample test for a proportion? A. The data values in the sample must be independent. B. The parent population must be normally distributed. C. The data must come from a random
asked by Katie on June 27, 2013 
statistics
A simple random sample of a size n is drawn from a population that is normally distributed. The sample mean, x is found to be 110, and the sample standard deviation, s, is found to be 10. A Construct a 95% confidence interval
asked by Anonymous on March 29, 2015 
Statistics
Which of the following criteria must be met to do a oneproportion z test? A. The data values in the sample must be dependent. B. The parent population must be normally distributed. C. The data must come from a random sample. D.
asked by Penny on October 29, 2013 
Probabilty & Statistic
A random sample is selected from a normal population with a mean of __40 and a standard deviation of __10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M _ 42. a. How large a
asked by Sharon on January 23, 2012 
Statistics
. A random sample is selected from a normal population with a mean of __40 and a standard deviation of __10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M _ 42. a. How large a
asked by Sharon on January 26, 2012 
Statistics
Kind attention Psydag: A random sample of size 20 from a normal population with sample mean 42 and sample standard deviation of 6 . To test the hypothesis the population mean 44 at 5% level of significance , find the pvalue and
asked by Mrs. Lakshmi on January 1, 2010 
Stats
A simple random sample will be obtained from a normally distributed population. Find the minimum sample size needed to be 99% confident that the sample standard deviation s is within 5% of the standard deviation. Is such a sample
asked by Lindsey on November 28, 2011