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1. For a population with a mean of 50 and a standa...

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1. For a population with a mean of 50 and a standard deviation of 10, how much error, on average, would you expect between the sample mean and the population mean for: a. a sample of n=4 scores b. a sample of n= 16 scores c. a sample of n= 25 scores 2. 5. A normal- shaped distribution has a mean of 80 and standard deviation of 15. a. What are the z-scores values that from the boundaries for the middle 95% of the distribution of sample means? b. Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution? 3. A population of scores forms a normal distribution with a mean of 40 and a standard deviation of 12. a. What is the probability of randomly selecting a score less than x=34? b. What is the probability of selecting a sample of n=9 scores with a mean less than m=34? c. What is the probability of selecting a sample of n= 36 scores with a mean less than m=34? 4. Describe the distribution of sample means (shape, expected value, and standard error) for samples of n=36 selected from a population with a mean of 100 and a standard deviation of 12.

 

Paper#13445 | Written in 18-Jul-2015

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