1. Calculate for the following given the values below. Express your answer in 2 decimal places (example: 25.00)

Mean	Standard deviation	Sample Size	Confidence Level
90	15	100	90%

What is the upper bound of the confidence interval?

2. The mean weight of the students in a school is 70 kilograms. A random sample of 25 students was taken and the mean weight was found to be 55 kilograms with a standard deviation of 20 kilograms. What is the test statistics? Express your answer into 2 decimal places (example: 25.00)

3. Calculate for the following given the values below. Express your answer in 2 decimal places (example: 25.00)

Mean	Standard deviation	Sample Size	Confidence Level
88	20	150	95%

What is the lower bound of the confidence interval?

4. Compute the value of test statistics from the given data. Express your answer into 2 decimal places (example: 25.00)

sample Mean 70 population mean 55 sample standard deviation 40 sample size 100