https://www.youtube.com/watch?v=9GtaIHFuEZU&feature=emb_err_woyt

(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)(Ïn). 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

https://www.youtube.com/watch?v=BQ88ni4bJNA&feature=emb_err_woyt

( 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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