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statistics
1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. (True/False) b. The graph of a normal distribution is bellshaped. (True/False) c. If a population has a normal
asked by ann on August 20, 2011 
Statistics
A normal distribution has a mean of ƒÝ = 100 with ƒã = 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between X = 90 and X = 110? a. 0.6915 b. 0.3085 c.
asked by Lyndyc on December 5, 2013 
statistics
A normal distribution has a mean of µ = 100 with standard deviation = 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between X = 80 and X = 100?
asked by Asia on March 7, 2012 
stats
(a) The test had six multiplechoice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed? Explain why or why not. The
asked by Anonymous on September 26, 2016 
stats
(a) The test had six multiplechoice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed? Explain why or why not. The
asked by Anonymous on September 26, 2016 
distribution
In a school, the IQ scores of the students have a normal distribution with a mean value of 100, and a standard deviation of 10. What is the probability that the IQ score of a randomly selected student is at least 120? (10 p)
asked by ABDULA YUSUF on April 16, 2016 
statistics
a normal distribution has a mean of 20 and a standard deviation of 10. Two scores are sampled randomly from the distribution and the second score is subtracted from the first. What is the probability that the difference score will
asked by Velvet on December 13, 2016 
stats
Question 5 of 10 A zscore of 2.0 is two standard deviations above the mean of the distribution (t). True False I chose answer A The z scores is a ratio of difference to variability (t). True False I chose False Question 6 of 10
asked by pls check on July 3, 2014 
Statistics
If the population is normally distribution then the sample must be normally distributed even for small sample size? True or False. The variance of the standard normal distribution is always equal to 1.? True or False. A continuous
asked by Jamie on February 7, 2014 
Statistics
True or False? As the degrees of freedom increase, the Student's t distribution becomes more like the standard normal distribution. Answer True False
asked by Desperate on July 7, 2012