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The mean of a population of raw scores is 33 1_X 5 122 . Use the criterion of .05 and the upper tail of the sampling distribution to test whether a sample with X 5 36.8 1N 5 302 represents this population. (a) What is the critical
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A sample of 400 items is taken from a population whose standard deviation is 10. The mean of the sample is 40. Test whether the sample has come from a population with mean 38. Also calculate 95% confidence interval for the
asked by Mritunjay on September 6, 2014 
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What is true of a random sample? A) it is the only way to sample a population. B)Each member of the sample is a volunteer. C) It is always the easiest way to sample a population. D) Each member of the population has an equal
asked by Liz on May 5, 2017 
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A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is 15. a) Compute the 95 % confidence interval for the population mean. b) Assume that the same sample mean was obtained from a
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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 
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which of the following is true of a random sample 1. its the only way to sample a population 2. each member of the sample is a volunteer 3. it is always the easiest way o sample a population 4. Each member of the population has an
asked by Freaky friday on a monday on April 16, 2018 
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A simple random sample of 60 items resulted in a sample mean of 96. The population standard deviation is 16. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean
asked by Mia on May 6, 2014 
math statistics
please help me I've waited for hours The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in northern Kentucky (The Cincinnati Enquirer, January 21, 2006). Use this price as the population mean, and
asked by aaron need urgent help on October 19, 2009 
Statistics
A population =100 and sd=25. A sample (n=150) has X=102. Using 2 tails of the sampling distribution and the .05 criterion. What is the critical value? Is the sample in the region of rejection? What does this indicate about the
asked by Pam on February 4, 2016 
math statistics
The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in northern Kentucky (The Cincinnati Enquirer, January 21, 2006). Use this price as the population mean, and assume the population standard
asked by aaron on October 19, 2009 
Statistics
Are these statements true or false? 1. The sample mean, the sample proportion and the sample standard deviation are all unbiased estimators of the corresponding population parameters. 2. If the population is normally distributed
asked by help on November 5, 2010