When appropriate, show all your work to receive credit. Round all answers to two decimal places and place a box around them.
1. (5 points) Describe the differences between a retrospective study, a prospective study, and an experiment. Use complete sentences and no more than half a page.
A Retrospective study is to identify the reasons leads to the incident or events that looking back to the history, and it is defined as a study that “examines past events to determine the factors that influenced the events” (Kuzma 1992,6). Prospective studies are calculating the future based on the data analysis, and it is defined as a study that “examine the outcomes of event that occur in the future” (Kuzma 1992,6).
2. (5 points) A researcher wants to select a simple random sample of 100 people …show more content…
P(B) = 3/15 = 0.2 or 20%
Probability of a damaged piece of equipment coming off the production line P(A) and P(B)
P(A) * P(B) = 0.2 * 0.15 = 0.03 or 3%
7. (5 points) A system was set up in parallel with two components, A and B. The probability of failure for A is .20 and for B is .10. In order for the system to fail, both must fail. What is the probability of a system failure? = 0.20*0.10 = 0.02 or 2%
8. (5 points) A system was set up in series with two components, A and B. In order for the system to fail, only one must fail. The probability of failure for A is .30 and for B is .20. What is the probability of a system failure?
The probability of a system failure is P(A) + P(B) = 0.30 + 0.20 = 0.5 or 5%
9. (5 points) What is the probability of selecting a club from a deck of cards?
A deck of card has 52 total and each suit has 13 total. So 13/52= 0.25 or 25%
10. (5 points) You have eight poker chips, six red and two blue. What is the probability of selecting one red chip?
Probability of selecting on red chip is 6/8 = 0.75 or
1. (5 points) Describe the differences between a retrospective study, a prospective study, and an experiment. Use complete sentences and no more than half a page.
A Retrospective study is to identify the reasons leads to the incident or events that looking back to the history, and it is defined as a study that “examines past events to determine the factors that influenced the events” (Kuzma 1992,6). Prospective studies are calculating the future based on the data analysis, and it is defined as a study that “examine the outcomes of event that occur in the future” (Kuzma 1992,6).
2. (5 points) A researcher wants to select a simple random sample of 100 people …show more content…
P(B) = 3/15 = 0.2 or 20%
Probability of a damaged piece of equipment coming off the production line P(A) and P(B)
P(A) * P(B) = 0.2 * 0.15 = 0.03 or 3%
7. (5 points) A system was set up in parallel with two components, A and B. The probability of failure for A is .20 and for B is .10. In order for the system to fail, both must fail. What is the probability of a system failure? = 0.20*0.10 = 0.02 or 2%
8. (5 points) A system was set up in series with two components, A and B. In order for the system to fail, only one must fail. The probability of failure for A is .30 and for B is .20. What is the probability of a system failure?
The probability of a system failure is P(A) + P(B) = 0.30 + 0.20 = 0.5 or 5%
9. (5 points) What is the probability of selecting a club from a deck of cards?
A deck of card has 52 total and each suit has 13 total. So 13/52= 0.25 or 25%
10. (5 points) You have eight poker chips, six red and two blue. What is the probability of selecting one red chip?
Probability of selecting on red chip is 6/8 = 0.75 or