MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Toby wants to know the average price of new cars at a particular dealearship. He randomly selects a sample of 35 cars and finds that the average price to be $20900$20900 with a standard deviation of $1400$1400. What is the 90% confidence interval for the mean price of cars at this particular dealership?

a.) Which distribution table will be used to find the critical value and why?

A.) t-table because the population standard deviation is unknown

B.) Z-table because the population standard deviation is unknown

C.) Z-table because the population standard deviation is known

D.) t-table because the population standard deviation is known



b.) With 90% confidence, we can say the true population mean price of cars at this dealership is between $  and $ .

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