1. A doctor's office wants to find out how long their patients must wait to be seen. From surveying 70 patients, the sample mean was 1.5 hrs and standard deviation .5

What are the values for X, Sx and N:

X =

Sx =

N =

2. For the above problem, please define what random variables X and X^ are in your words:

X = is the_______________________________________

X^ = is the _____________________________________

3. 500 random citizens were sampled to see whether they still used a land line, 421 responded yes. Using a 95% confidence level, compute the confidence interval estimate:

n = 500. x =421. Proportion p'=x/n. = _____

q = 1 - p' = __________

. Z-table value for Z.025 = ________

(Section 8.6)

4. A track competition of 150 different schools has a lower limit of .8 and upper limit of .16

Determine the level of confidence using formula for p' = Upper limit + Lower limit /2

p' = _______

Z = SQRT((p*(1-p)/n) = ______

Therefore Z = ____

5. A doctor wants to find out how many patients have a 30 day overdue bill. Surveying 500 patients, 300 are more than 30 days. Compare a 90% confidence interval by using the p' formula:

X = 300 and n = 500 while p' = x/n = _________

q' = 1 - p' = _______

Therefore Z.05 = ________