Assume that the population has a normal distribution. use a 95% confidence level . A sociologist develops a test to measure attitudes towards public transportation, and 8 randomly selected subjects...

Assume that the population has a normal distribution. use a 95% confidence level .

A sociologist develops a test to measure attitudes towards public transportation, and 8 randomly selected subjects are given the test.

the below are their scores.

78    69    72    90     68    58     98     75

4) Find the margin of error E

5) Construct a confidence interval for the mean value score of all such subjects.