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Homework answers / question archive / 1)Explain the difference between descriptive and inferential statistics
1)Explain the difference between descriptive and inferential statistics.
2) 
Define a point estimate. What is the best point estimate for 
µ 
? 

distribution is required. Compute the error estimate using either E = z /2 · ^{Η}n or
8) 
Describe the steps for finding a confidence interval. 

. 
14) 
Identify the correct distribution (z, t, or neither) for each of the following. 
15) 
15) 
Complete the table to compare z and t distributions. 


16 
What is the best point estimate for the population proportion? Explain why that point 
estimate is best. 

z ^{/2 }2 · p^{^} q^{^ }. Based on this formula, discuss the fact that sample size is not n = ^{?}
E2 dependent on the population size; that is, it is not necessary to sample a particular percent of the population.
The population was very small  only 30. Ruth constructed a confidence interval for the mean weight of all adult males in the city. She based her confidence interval on a very small sample of only 5. Which confidence interval is likely to give a better estimate of the mean it is estimating? Which is likely to be more of a problem, a small sample or a small population?
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