ex2_fa08 - STA 6166 Fall 2008 Exam 2 PRINT NAME Ford wants to compare mean assembly times for Explorers at their 3 assembly plants They observe random

ex2_fa08 - STA 6166 Fall 2008 Exam 2 PRINT NAME Ford wants...

This preview shows page 1 - 3 out of 5 pages.

STA 6166 – Fall 2008 – Exam 2 PRINT NAME _____________________ Ford wants to compare mean assembly times for Explorer’s at their 3 assembly plants. They observe random samples of 10 cars at each plant, and obtain the following summary statistics on assembly times (in minutes):PlantMeanStd. Dev.Atlanta18012Chicago18510Detroit1759(a) Compute the between plant (Treatment) sum of squares and its degrees of freedom(b) Compute the within plant (Error) sum of squares and its degrees of freedom(c)Compute the test statistic
(d)Conclude that the population means differ (α=0.0 529if the test statistic is __________A researcher wishes to compare two species of ferns with respect to chemical uptake. She samples 10 ferns of each species, and measures the amount of the chemical uptake in each of the 20 specimens. The summary statistics and relevant quantities are given below (she finds no evidence to believe the population variances are equal):a)Give a 95% confidence interval for the difference in true (population) means for the 2 species.b)

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture