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# Assume that all variable are approximately normally

ISBN: 9780073534985 75

## Solution for problem 6E Chapter 7.2

Elementary Statistics: A Step By Step Approach | 9th Edition

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Problem 6E

Assume that all variable are approximately normally distributed.

Digital Camera PricesThe prices (in dollars) for a particular model of digital camera with 6.0 megapixels and an optical 3X zoom lens are shown below for 10 online retailers. Estimate the true mean price for this particular model with 95% confidence.

 225 240 215 206 211 210 193 250 225 202
Step-by-Step Solution:
Step 1 of 3

Solution 6E

Step1 of 3:

From the given problem we have a data set and it is given below:

 225 240 215 206 211 210 193 250 225 202

We need to estimate the true mean price for this particular model with 95% confidence.

Step2 of 3:

1). The mean price of the particular model is obtained from excel by using the function:

“=Average(Select all data)”

2). The standard deviation of the particular model is obtained from excel by using the function:

“=Std(Select all data)”

3). We have,

Now,

Therefore,

The degrees of freedom is calculated by using the formula:

Step 2 of 3

Step 3 of 3

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