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A company that develops an automated customer service model is interested in knowing whether two versions, Version A and Version B, will get different ratings from customers. Participants in a focus group are taken through samples from both versions, then take a survey to rate each version. A summary of the data obtained from the study is given below. Assume ratings from the different surveys generally have the same standard deviation. Version A Version B Mean 33.133 28.67 15 15 Observations Pearson Correlation Hypothesized Mean Difference -0.325 0.00 df 14 t Stat -1.426 P(T<=t) one-tail 0.088 P= Ex: 1.234 t Critical one-tail -1.345 P(T<=t) two-tail 0.176 -1.761 t Critical two-tail Confidence Level 95% -3 -2 -1 3 t = Ex: 1.234 n = Ex: 9 Degrees of freedom: df = Point estimate for Version A: 1 = Ex: 1234 Point estimate for Version B: X₂ = 0 1 t=

A company that develops an automated customer service model is interested in knowing whether two versions, Version A and Version B, will get different ratings from customers. Participants in a focus group are taken through samples from both versions, then take a survey to rate each version. A summary of the data obtained from the study is given below. Assume ratings from the different surveys generally have the same standard deviation. Version A Version B Mean 33.133 28.67 15 15 Observations Pearson Correlation Hypothesized Mean Difference -0.325 0.00 df 14 t Stat -1.426 P(T<=t) one-tail 0.088 P= Ex: 1.234 t Critical one-tail -1.345 P(T<=t) two-tail 0.176 -1.761 t Critical two-tail Confidence Level 95% -3 -2 -1 3 t = Ex: 1.234 n = Ex: 9 Degrees of freedom: df = Point estimate for Version A: 1 = Ex: 1234 Point estimate for Version B: X₂ = 0 1 t=

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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bothesis tests for the difference between two population means Jump to level T A company that develops an automated customer service model is interested in knowing whether two versions, Version A and Version B, will get different ratings from customers. Participants in a focus group are taken through samples from both versions, then take a survey to rate each version. A summary of the data obtained from the study is given below. Assume ratings from the different surveys generally have the same standard deviation. Version A Version B Mean 33.133 28.67 Observations Pearson Correlation -0.325 Hypothesized Mean Difference 0.00 -1.426 P(T<-t) one-tail 0.088 PEx: 1.234 + t Critical one-tail P(T<t) two-tail 0.176 It Critical two-tail -1.761 Confidence Level 95% 3 -2 3 t Ex: 1.234 n= Ex 9 Degrees of freedom: df = Point estimate for Version A: ₁ Ex: 1234 Point estimate for Version B. ₂ = 1 1 Check TE ES T 0 t= 1 THOT 2
Transcribed Image Text:bothesis tests for the difference between two population means Jump to level T A company that develops an automated customer service model is interested in knowing whether two versions, Version A and Version B, will get different ratings from customers. Participants in a focus group are taken through samples from both versions, then take a survey to rate each version. A summary of the data obtained from the study is given below. Assume ratings from the different surveys generally have the same standard deviation. Version A Version B Mean 33.133 28.67 Observations Pearson Correlation -0.325 Hypothesized Mean Difference 0.00 -1.426 P(T<-t) one-tail 0.088 PEx: 1.234 + t Critical one-tail P(T<t) two-tail 0.176 It Critical two-tail -1.761 Confidence Level 95% 3 -2 3 t Ex: 1.234 n= Ex 9 Degrees of freedom: df = Point estimate for Version A: ₁ Ex: 1234 Point estimate for Version B. ₂ = 1 1 Check TE ES T 0 t= 1 THOT 2
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