Compute a 95% confidence interval for the population mean, b

1. Compute a 95% confidence interval for the population mean,
based on the sampling numbers 21, 28, 33, 34, 25, 26, and 135. Find the lower and upper limits of the interval

2. Change the last value to 27 and re-compute the confidence interval. The numbers now are 21, 28, 33, 34, 25, 26, and 27

3. What is an outlier and how does it affects the confidence interval

13. The director of admissions of umuc is concerned about the high cost of text books for the students each semester. A sample of 25 students enrolled in the university indicates that x (bar)= $315.40 and s-43.20. Using a significance level of 1. What is the boundaries of the confidence

14. The director of admissions of umuc is concerned about the high cost of text books for the students each semester. A sample of 25 students enrolled in the university indicates the x(bar)= $315.40 and s= $43.20
. Using the .10level of significance, is there evidence that the population mean is above $300. A mean that is not in a confidence interval is rejected by confidence interval and we say there is evidence.

15. The director of admissions at the umuc is concerned about the high cost of books for the student each semester. A sample of 25 student enrolled in the university indicates that x(bar)= 315.40 and s=75$ (the standard deviation is different from the first part). Using the 0.5 level of significance that, is there evidence that the population mean is about $300

16. Explain the difference between parts A and C. In both parts we are asking whether or not there is evidence that the population mean was over $300
In part A: X(bar)=$315.40; s=43.2;sample size=25
In part C: x(bar)=315.40; s=75, sample size=25