Time left 0 stion 43 Consider the following hypothesis test: yet Ho : / = 170 wered irked out of Ha : u # 170 A sample of 23 provided a sample mean of 158 and a sample standard deviation Flag 20. Find the value of the test statistic. estion Select one: O a. t = 0.60 Ob. t = 2.88 O c. t= -0.60 O d. t= -2.88 Question 44 The average salary of 64 employee was 5400. Using historical data, we will assum Not yet that the population standard deviation is 280. Find the 90% confidence interval f answered the population mean salary. Marked out of 1.00 Select one: P Flag question a. 5400 + 57.58 O b. 5400 + 53.46 O c. 5400 4 55.52 O d. 5400 4 51.41 O a N O 9