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March 28, 2015

March 28, 2015

Posted by **Anonymous** on Thursday, May 9, 2013 at 1:16pm.

2. A study of 50 pizza delivery workers found that they could make 6 deliveries per hour with a standard deviation of 1. Find the 95% confidence interval of the mean for all pizza delivery workers.

3. A random sample showed that the average number of tv's in each household is 2.3 with a standard deviation of .4. Find the 90% confidence level for the average number of tv's in every household in the population.

4. A researcher revealed that the average number of people who have a driver's license out of a sample of 100 people is 1.5 with a standard deviation of .3. Find the 80% confidence interval for the mean of the population.

- Statistics -
**PsyDAG**, Thursday, May 9, 2013 at 1:30pm1. 99% = mean ± 2.575 SEm

SEm = SD/√n

2. ± 1.96 SEm

3. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.05) to get the value for the Z score.

4. Same table, but look for .10.

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