The prices (in dollars) for a particular model of digital camera with 6.0 megapixels and an optical 3x zoom lens are shown below for 9 online retailers. Round sample statistics and final answers to one decimal place.  222  197  195  181  250  217  194  227  231 Estimate the true mean price for this particular model with 90% confidence. Assume the variable is normally distributed.  ***** Please show step by step (including how you get the standard deviation because i forgot how to get that part and i am stuck!****

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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The prices (in dollars) for a particular model of digital camera with 6.0 megapixels and an optical 3x zoom lens are shown below for 9 online retailers. Round sample statistics and final answers to one decimal place. 

222  197  195  181  250  217  194  227  231

Estimate the true mean price for this particular model with 90% confidence. Assume the variable is normally distributed. 

***** Please show step by step (including how you get the standard deviation because i forgot how to get that part and i am stuck!****

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