# HW8 - Stat 3011 Homework 8 Stat 3011 Homework 8 Due Tuesday...

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Stat 3011 Homework 8 Stat 3011: Homework 8 Due: Tuesday, March 31st Directions: See the homework website for general directions. Assigned Exercises: 1. 8.28 (page 383) (a) book part a (Recall that the standard error is s/ n .) (b) Show that the 95% conﬁdence interval for μ , the true mean ideal number of kids for males, is (2.94, 3.17). (c) Interpret the conﬁdence interval from part b. 2. 8.30 (page 383) Directions for Rweb are given on the next page. (a) Use Rweb to create a stem-and-leaf plot of the weight change data. (b) Check the two assumptions needed for the conﬁdence interval. Does it appear that they hold? (c) Use Rweb to calculate x , the sample mean, and s , the sample standard deviation for the weight change data. (d) Use your answers to part c to calculate a 95% conﬁdence interval for μ , the true popu- lation mean change in weight for family therapy. (e) Use the “t.test” function in Rweb to verify your answer to part d. (f) Explain why the interval in part d suggests that the true mean change in weight is

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## This note was uploaded on 10/02/2011 for the course STAT 3011 taught by Professor Wang,zhan during the Spring '09 term at Minnesota.

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HW8 - Stat 3011 Homework 8 Stat 3011 Homework 8 Due Tuesday...

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