1. Given the following data, find the upper bound of confidence interval. Your answer must be in two decimal places. Sample size = 100, Mean = 80, Standard Deviation = 20, Confidence coefficient = 1.645

2. Supposed that the z is the test statistics for hypothesis testing, calculate the value of the z for each of the following. Express your answer in 2 decimal places.

a. = 8, = 4, n = 100, x = 7.2

Answer:

b. = 25, = 5, n = 90, x = 23.4

Answer:

c. = 77, = 6, n = 150, x = 78.2

Answer:

d. = 8.5, = 4, n = 120, x = 7.2

Answer:

e. = 20.8, = 4, n = 90, x = 21.2

Answer:

f. = 31.2, = 3, n = 77, x = 32

Answer: