Question

Measurements of the sodium content in samples of two brands of chocolate bar yield the following results (in grams):

Brand A: 34.36    31.26    37.36    28.52    33.14    32.74    34.34    34.33    33.95
Brand B: 41.08    38.22    39.59    38.82    36.24    37.73    35.03    39.22    34.13    34.33    34.98    29.64    40.60

Let μXμX represent the population mean for Brand B and let μYμY represent the population mean for Brand A. Find a 98% confidence interval for the difference μX−μYμX−μY. Round down the degrees of freedom to the nearest integer and round the answers to three decimal places.

The 98% confidence interval is: ( ____, ____ )

I have tried everything, and it says every answer is wrong.

Answer 1

First we will calculate the sample mean and sample standard deviation for both Brands.
For Brand A:

For Brand B:

Now we will calculate the confidence interval

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