GRAPHICAL ANALYSIS In Exercises 5154, (a) use a graphing utility to graph the function, (b) use the graph to approximate any -intercepts of the graph, (c) set and solve the resulting equation, and (d) compare the results of part (c) with any -intercepts of the graph.

Week 10 Section 6.3 §6.3Confidence Interval for When x is Normally Distributed, n is Small and Unknown Theorem: Suppose x is a normally distributed random variable. Suppose a SRS of size n 2 is obtained. Then the 1 confidence interval for the mean value of x is given as - xx= sample mean value. - s =sample standard deviation - n = sample size - df = “degrees of freedom” = n1 A simple random sample of 15 quiz scores yieldsx =4,5,5,6,6,6,7,7,7,7,7,8,8,9,10. a. Find the appropriate tn1,/2 appropriate for a 90% CI. - Sigma is unknown and n is <30, so we know that 1- = .90 o .1 o Right Tail Area - n=15 - df= n-1 = 14 - t.05, 141.761 (look on table) b. Cal