# statistic

(Known Ï)
a. What is the Formula for the Confidence Interval for the Mean with a known Ï?
b.  What is the definition of a confidence interval estimate ( explain what the formula means)?
c. Suppose that you have a sample of n= 25 and has a mean of 362.3 grams (Î¼= 362.3g)  and a standard deviation of 15 grams.  Using the formula ????±(1.96)(????????)Î¼±(1.96)(Ïn).  Find the estimate of Î¼
2. Read section 8.2 and watch the following video for finding a confidence interval estimate for the Mean with an unknown  Ï
Section 8.2
( Unknown Ï)

a. What is the formula for the Confidence Interval for the Mean with an unknown Ï
b. What is the degrees of freedom and how do you find it?
c. Why can you never really have 100% confidence of correctly estimating the population characteristic of interest?
d.  When should you use the t distribution to develop the confidence interval estimate for the mean?
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