A camp director is interested in the mean number of letters each child sends during his or her camp session. The population standard deviation is known to be 2.5. A survey of 20 campers is taken. The mean from the sample is 7.7 with a sample standard deviation of 2.7.Part (a)Find the following. (Enter exact numbers as integers, fractions, or decimals.)(i) x = (ii) ? = (iii) n = Construct a 90% confidence interval for the population mean number of letters campers send home.(i) State the confidence interval. (Round your answers to two decimal places.) , (ii) Sketch the graph. (Round your answers to two decimal places.) (iii) Calculate the error bound. (Round your answer to two decimal places.)

Name: A camp director is interested in the mean number of letters each child
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Description: A camp director is interested in the mean number of letters each child sends during his or her camp session. The population standard deviation is known to be 2.5. A survey of 20 campers is taken. The mean from the sample is 7.7 with a sample standard

Confidence interval for mean is given by, (X bar + - z* s/√n) Here x bar = 7.7, s= 2.7 and n= 20 Z…

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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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A camp director is interested in the mean number of letters each child sends during his or her camp session. The population standard deviation is known to be 2.5. A survey of 20 campers is taken. The mean from the sample is 7.7 with a sample standard deviation of 2.7.

Part (a)

Find the following. (Enter exact numbers as integers, fractions, or decimals.)
(i)
x =

(ii)
? =

(iii)
n =

Construct a 90% confidence interval for the population mean number of letters campers send home.
(i) State the confidence interval. (Round your answers to two decimal places.)

  ,

(ii) Sketch the graph. (Round your answers to two decimal places.)

(iii) Calculate the error bound. (Round your answer to two decimal places.)

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