Kelsi is curious to see if ST 243Z campus students typically got their first cell phone at a younger age than they (Kelsi) gottheir first phone. To investigate this, they take a random sample of 20 students from all ST 243Z campus students thisWinter 2024 term and find those students had an average age of 11.85 years when they reported receiving their firstphone. The standard deviation of the population, ox, is known to be 1.91 years. The histogram and boxplot of thesample are provided below. We are interested at exploring at the 90% confidence level. What is the average age forgetting their first phone of all ST 243Z campus students in Winter 2024?8 9Age when got first phone10 1112Age (years)2. Identify pertinent information:13141589Age when got first phoneb. Take an inventory of the information that we have available.1011T12Age (years)a. Identify the parameter of interest (notation and describe in words/context).T131415

Answered: Image /qna-images/answer/587b138e-1ff5-46eb-a0de-e71fef825602.jpg

Answered: Kelsi is curious to see if ST 243Z…

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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It currently takes users a mean of 26 minutes to install the most popular computer program made by RodeTech, a software design company. After changes have been made to the program, the company executives want to know if the new mean is now different from 26 minutes so that they can change their advertising accordingly. A simple random sample of 51 new customers are asked to time how long it takes for them to install the software. The sample mean is 24.9 minutes with a standard deviation of 2.7 minutes. Perform a hypothesis test at the 0.025 level of significance to see if the mean installation time has changed. Step 3 of 3 : Draw a conclusion and interpret the decision.
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