To determine the viscosity of an engine oil, a ball is dropped into a calibrated tube filled with this oil, and the time taken for the ball to travel a determined distance is measured. After having carried out 26 tests, an average time of 22.85 seconds and a standard deviation of 0.40 seconds were calculated. a) From these results, the laboratory states that the average time to cover the distance lies between 22.6868 and 23.0132 seconds. What is the confidence level associated with this statement? Answer: (1- a) = b) Find the 90% confidence interval to estimate the average time it takes for the ball to travel the distance. Answer: = -n u+ = c) How many additional trials must be carried out if we want to estimate the average time to cover the distance with the same margin of error as in a) but with a confidence level of 99%? Answer:
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
Try to keep the answers to a minimum of 4 d.p.
Also, after working out the problem, it appears that the answers (a) 96.2511 (b) [22.720,22.97904] and (c) 40 are wrong and I cannot understand why.
Please help by providing detailed explanation to answers.
Thanks
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