Mathematics, 18.11.2020 17:10, aigo
An unconfined compression test was performed to determine the average strength of concrete cylinders (in psi). It is believed that the strength is approximately normally distributed with a standard deviation of 256 psi. A sample of 70 concrete cylinders was taken, and it was found that the average strength was 3000 psi. Find a 91% confidence interval for the true average strength of the concrete.
Be sure to:
• State the value for α.
• State whether you should use z or t and find the appropriate value. Round z-values to 2 decimals. Round t-values to 3 decimals.
• Find the confidence interval (to 2 decimals). State the parameter your confidence interval is for.
• Write a verbal interpretation of your confidence interval.
Answers: 2
Mathematics, 21.06.2019 23:00, jetblackcap
Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect
Answers: 1
Mathematics, 22.06.2019 00:50, NayeliNoel
E. which of the following is not a possible probability? a. 25/100 b. 1.25 c. 1 d. 0
Answers: 1
An unconfined compression test was performed to determine the average strength of concrete cylinders...
Mathematics, 24.11.2019 00:31
Mathematics, 24.11.2019 00:31
History, 24.11.2019 00:31