James H.C. Creighton's A First Course in Probability Models and Statistical PDF

By James H.C. Creighton

ISBN-10: 1441985409

ISBN-13: 9781441985408

ISBN-10: 1461264316

ISBN-13: 9781461264316

Welcome to new territory: A path in likelihood types and statistical inference. the idea that of likelihood isn't new to you after all. you could have encountered it on account that formative years in video games of chance-card video games, for instance, or video games with cube or cash. and also you find out about the "90% likelihood of rain" from climate studies. yet when you get past uncomplicated expressions of likelihood into extra sophisticated research, it really is new territory. and intensely international territory it truly is. you need to have encountered experiences of statistical leads to voter sur­ veys, opinion polls, and different such reports, yet how are conclusions from these reports acquired? how are you going to interview quite a few citizens the day prior to an election and nonetheless be certain particularly heavily how HUN­ DREDS of hundreds of thousands of electorate will vote? that is records. you can find it very attention-grabbing in this first path to work out how a correctly designed statistical learn can in achieving rather a lot wisdom from such tremendously incomplete details. it truly is possible-statistics works! yet HOW does it paintings? through the top of this path you should have understood that and masses extra. Welcome to the enchanted forest.

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Extra resources for A First Course in Probability Models and Statistical Inference

Example text

And" means multiply. Of course, we warned you that these rules don't hold in complete generality. Let's explore these rules a bit. In what follows, let X be the number of dots on the top face of a fair die: (a) Under what conditions do these simple rules hold? (b) Which simple rule calculates P(2 :S X :S 5)? Explain. 3 On one draw of a card from a well-shuffled deck of 52 playing cards, what's the probability that you do NOT draw an eight? Do this (a) directl y, by just counting, (b) using one of our three probability rules.

Here are the dice: • all faces are equally likely; • two dots come up 50% of the time and the other faces are equally likely; • two dots come up 40% of the time, five dots 20% of the time, and the other faces are equally likely. (a) Compare the predictability of your gain/loss for each of the three dice. (b) In part (a), if the player breaks even in the long run, the gambling house won't be a profitable business! Suppose the house wants to make an average profit of 50 cents per play; what should they charge to play?

Clearly, the expected value by itself will not suffice. As we see in the loaded die above, the expected value misses an important characteristic of the model for this die. It misses the fact that the probability is "spread" to the extreme values of X. We need a parameter to capture this characteristic of the model, the "spread" or "dispersion" of the values from the mean. 5=/-tx We'll discuss graphical presentations of distributions in more detail later, but as you can see, the graph for the loaded die shows at a glance that most of the probability for that die is concentrated at the extreme values of X.

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A First Course in Probability Models and Statistical Inference by James H.C. Creighton


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