To compare customer satisfaction levels of two competing ice cream companies, 8 customers of Company 1 and 5 customers of Company 2 ware randomly selected and were asked to rate their ice creams on a five-point scale, with 1 being least satisfied and 5 most satisfied. The survey results are summarized in the following Table: Company 1 Company 2 ?1=8 ?2=5 ̅?̅̅1̅=3.21 ̅?̅̅2̅=2.22 ?1= 0.31 ?2= 0. 21 By assuming both equal variances and unequal variances: Construct an interval estimate at 95°/ confidence interval for difference of means of two ice cream companies.

To compare customer satisfaction levels of two competing ice cream companies, 8 customers of Company 1 and 5 customers of Company 2 ware randomly selected and were asked to rate their ice creams on a five-point scale, with 1 being least satisfied and 5 most satisfied. The survey results are summarized in the following Table: Company 1 Company 2 ?1=8 ?2=5 ̅?̅̅1̅=3.21 ̅?̅̅2̅=2.22 ?1= 0.31 ?2= 0. 21 By assuming both equal variances and unequal variances: Construct an interval estimate at 95°/ confidence interval for difference of means of two ice cream companies.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.6: Summarizing Categorical Data

Problem 10CYU

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Company 1	Company 2
?₁=8	?₂=5
̅?̅̅1̅=3.21	̅?̅̅2̅=2.22
?₁= 0.31	?₂= 0. 21