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Gasoline. Many drivers of cars that can run on regular gas actually buy premium in the belief that they will get better gas mileage. To test that belief, we use 10 cars from a company fleet in which all the cars run on regular gas. Each car is filled first with either regular or premium gasoline, decided by a coin toss, and the mileage for that tankful is recorded. Then the mileage is recorded again for the same cars for a tankful of the other kind of gasoline. We don't let the drivers know about this experiment. Here are the results (miles per gallon):
a) Is there evidence that cars get significantly better fuel economy with premium gasoline?
b) How big might that difference be? Check a 90% confidence interval.
c) Even if the difference is significant, why might the company choose to stick with regular gasoline?
d) Suppose you had done a "bad thing." (We're sure you didn't.) Suppose you had mistakenly treated these data as two independent samples instead of matched pairs. What would the significance test have found? Carefully explain why the results are so different.
e) Use a matched-pairs sign test to test the appropriate hypothesis. Do your conclusions change from those in part a?
Write the function prototype for the divide By Two function from Pencil and Paper Exercise 1. (The answers to TRY THIS Exercises are located at the end of the chapter.)
Convert the following left recursion grammar into right recursion: a)S->S0S|1 b)S->Aa|Bb ,A->Aa|bA|a, B->Bb|a
How many cups of each type of puppy food should be used in order to minimize the cost?
You should assume that you are talking to someone who is conceptually able to do the task, but has never actually done it before. For example, you might be telling a young child.
Write method multiple that determines, for a pair of integers, whether the second integer is a multiple of the first. The method should take two integer arguments and return true if the second is a multiple of the first and false otherwise.
Gobbling goat There is a grassy field in the shape of a circle with a radius of 100 feet. A goat is attached by a rope to a hook at a fixed point on the field's border. How long should the rope be to let the goat reach only half of the grass in th..
Tony Prince and his team working on the Recreation and Wellness Intranet Project have been asked to refine the existing cost estimate for the project so they can evaluate supplier bids and have a solid cost baseline for evaluating project performa..
Choise a technology topic to research on the internet, such as cloud computing. Web 2.0, computer ethics, the deep web, or green computing. Using the techniques you learned in this lesson, search for web related to your topic.
Choose one large multinational corporation that operates in a number of countries to learn how its public relations activities differ from country to country. Examples of multinational corporations include General Electric, Nissan, Nestle, ExxonMo..
For this course, your projects will be for a company named RL Medical Imaging (RLMI).
What is the difference between trunk mode and access mode in Cisco networking?
How many paths lead from the input to a given output sample? Is this true for every output sample? (c) Compute X (3) using the operations dictated by this flow graph.
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