<PRE><B>Question 489597</B>
1.A confidence interval is an interval estimate of which: a population parameter or a sample statistic? Please explain.
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Ans: A population parameter.
A sample is used to develop the interval extimate, but the goal
is to develop a confidence statement for the population mean
or the population proportion, or some other population parameter.
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2. Consider a sample mean xbar of 46 calculated from a sample of size 35 drawn from a population of over 1000. 
Would it be appropriate to use the standard score table to look up the probability of a z score calculated on these data?
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Textbooks vary in answering questions of this type.  The current thinking
is that the t-distribution should be used to test the population mean.
I would suggest you carefully read the testing conditions in your text.
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Cheers,
Stan H. 

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