10.13 The sales manager for a very exclusive brand of automobile declares that, after his staff had completed a new training program, less than 10% of their clients were dissatisfied with the service obtained at the dealership. The owner of the dealership hires a marketing firm to evaluate this claim. In a random sample of 40 customers, only 5 of the 40 customers were dissatisfied with the dealerships service. a. Is there significant evidence that the sales manager's claim is supported by the data? Use a .05. b. Place a 95% confidence interval on the proportion of customers who are dissatis- fied with the service in their encounters with the staff at the dealership.
10.13 The sales manager for a very exclusive brand of automobile declares that, after his staff had completed a new training program, less than 10% of their clients were dissatisfied with the service obtained at the dealership. The owner of the dealership hires a marketing firm to evaluate this claim. In a random sample of 40 customers, only 5 of the 40 customers were dissatisfied with the dealerships service. a. Is there significant evidence that the sales manager's claim is supported by the data? Use a .05. b. Place a 95% confidence interval on the proportion of customers who are dissatis- fied with the service in their encounters with the staff at the dealership.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:**Problem 10.13**
The sales manager for a very exclusive brand of automobiles declares that, after his staff had completed a new training program, less than 10% of their clients were dissatisfied with the service obtained at the dealership. The owner of the dealership hires a marketing firm to evaluate this claim. In a random sample of 40 customers, only 5 of the 40 customers were dissatisfied with the dealership's service.
a. Is there significant evidence that the sales manager’s claim is supported by the data? Use α = 0.05.
b. Place a 95% confidence interval on the proportion of customers who are dissatisfied with the service in their encounters with the staff at the dealership.
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