Ski wax Bjork Larsen was trying to decide whether touse a new racing wax for cross-country skis. He decidedthat the wax would be worth the price if he could averageless than 55 seconds on a course he knew well, so heplanned to test the wax by racing on the course 8 times.a) Suppose that he eventually decides not to buy the wax,but it really would lower his average time to below55 seconds. What kind of error would he have made?b) His 8 race times were 56.3, 65.9, 50.5, 52.4, 46.5, 57.8,52.2, and 43.2 seconds. Should he buy the wax? Explain.
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.
Ski wax Bjork Larsen was trying to decide whether to
use a new racing wax for cross-country skis. He decided
that the wax would be worth the price if he could average
less than 55 seconds on a course he knew well, so he
planned to test the wax by racing on the course 8 times.
a) Suppose that he eventually decides not to buy the wax,
but it really would lower his average time to below
55 seconds. What kind of error would he have made?
b) His 8 race times were 56.3, 65.9, 50.5, 52.4, 46.5, 57.8,
52.2, and 43.2 seconds. Should he buy the wax? Explain.
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