Question

How smart is your phone? A random sample of 11 smartphones sold over the internet had the following prices, in dollars:

199 169 385 329 269 149

135 249 349 299 249

Assume the population standard deviation is "q"=85.

a. Explain why it is necessary to check whether the population is approxiamately normal before c confidence interval.

Step 1

The standard deviation of the...

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