c. Construct and interpret the 99% confidence interval estimate for the mean daily usage time for the ISP's customers. The 99% confidence interval estimate isO minute(s) (Round to two decimal places as needed. Use ascending order.) minute(s).
c. Construct and interpret the 99% confidence interval estimate for the mean daily usage time for the ISP's customers. The 99% confidence interval estimate isO minute(s) (Round to two decimal places as needed. Use ascending order.) minute(s).
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Question
27. Please answer literal C

Transcribed Image Text:An internet service provider (ISP) has experienced rapid growth in the past five years. As part of its marketing strategy, the company promises fast connections and dependable service. To achieve its objectives, the company
constantly evaluates the capacity of its servers. One component of its evaluating is an analysis of the average amount of time a customer is connected and actively using the Internet daily. A random sample of 12 customer records
shows the following daily usage times, in minutes. Complete parts a through d below.
288
332
311
302
329
328
282
287
299
389
352
314
D. Tne managers or tne ISP s marketing aepartment wouia Iike to deveiop a 99% conTidence intervai estimate tor tne popuiatIon mean aally customer usage time. Because tne popuiation standara aeviation or ally customer
usage time is unknown and the sample size
small, what assumption must the marketing managers make concerning the population of daily customer usage times?
The population distribution is uniformly distributed.
V The population distribution is approximately normal.
The population distribution is exactly symmetrical.
The sample size is at least 30.
c. Construct and interpret the 99% confidence interval estimate for the mean daily usage time for the ISP's customers.
The 99% confidence interval estimate is minute(s)
(Round to two decimal places as needed. Use ascending order.)
minute(s).
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