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A group of items of data have been found to be normally distributed with a mean of 80 and a standard deviation of 6. Please convert 80 to a z-score and show the calculation.
Generate three random observations from the uniform distribution between -10 and 40 by using the following random numbers: 0.0965,0.5692,0.6658
What is the 25th percentile of a chi squared distribution with 20 degrees of freedom? What symbol is used to denote this value?
Find out the operating characteristics for this system.
Thirty homes responded, and the sample mean water use per day was 77 gallons with a standard deviation of 9.0 gallons per day.
Why do we have so many several measures of central tendency? Are all really essential or do they essentially give same information?
Assume that the annual rate of return for a common biotechnology stock is normally distributed with a mean of 5.5% and a standard deviation of 6%.
The athletic director claims that the atendance is the same as last year. What is the test value needed to evaluate the claim?
Based on the empirical data determine the following probabilities:
Duracell Ltd claim that the life of their batteries in motorised soft toys is approximately normally distributed with a mean of 102.9 hours and a standard deviation of 16.5 hours.
Compare two models. Model #1 has an r-squared of .55 and an adjusted r-squared of .50. Model #2 has an r-squared of .52 and an adjusted r-squared of .51. Given this information, what model should you use?
Anthony is measuring his participants' emotional states in two different ways (self-report and galvanic skin response) in order to gain a greater confidence that he is actually measuring the emotional that he thinks he is.
A craftsperson makes stuffed animals for sale. 85% of the animals she makes are bears while the remaining 15% are rabbits. Suppose she sells 75% of her bears at craft shows but only 50% of her rabbits are sold at craft shows.
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