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# Confidence Co-Efficients

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Olive Garden Swiss Chalet
Sample size 50 45
Sample mean \$22 \$18
Standard deviation \$3.00 \$3.25

How do I create interval estimate for the difference between the average fees of the 2 restaurants at a confidence co-effiecent at 95 %

What do I need to do to find out the difference in amount spent at the restaurants (sample means)? What test statistic do I use? I thought I should use the z-test because the sample size was greater than 30.

##### Solution Summary

The expert determines how to create interval estimate for the difference between the average fees of the 2 restaurants at a confidence coefficient at 95 %

What do I need to do to find out the difference in amount spent at the restaurants (sample means)? What test statistic do I use? I thought I should use the z-test because the sample size was greater than 30.

##### Solution Preview

This is a test of difference in sample means
Usually we use t test, but in this question you might use z stat as well, given the large sample size.

Find the 95% confidence interval for the difference between the two means
Let Md=µ1-µ2= 22-18 = 4
In the general formula, the estimated standard error, SMd, is computed assuming that the variances in the two populations are equal. when n1 &#8800; n2. The ...

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.