Where did Lobster Fra Diavolo originate?
Standardized scores z-scores Video transcript Here's the second problem from CK It's an open source textbook, essentially. I'm using it essentially to get some practice on some statistics problems.
So here, number 2. The grades on a statistics midterm for a high school are normally distributed Statisitcs normal distribution a mean of 81 and a standard deviation of 6.
Calculate the z-scores for each of the following exam grades. Draw and label a sketch for each example. We can probably do it all on the same example. But the first thing we'd have to do is just remember what is a z-score. What is a z-score? A z-score is literally just measuring how many standard deviations away from the mean?
So we literally just have to calculate how many standard deviations each of these guys are from the mean, and that's their z-scores.
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|Probability and statistics symbols table||Where did Lobster Fra Diavolo originate? Like many popular Italian-American dishes, there are several theories.|
So let me do part a. So we have So first we can just figure out how far is 65 from the mean. Let me just draw one chart here that we can use the entire time. So it's just our distribution. We have a mean of And then a standard deviation of 6. So our distribution, they're telling us that it's normally distributed.
So I can draw a nice bell curve here. They're saying it's normally distributed, so that's as good of a bell curve as I'm capable of drawing. This is the mean right there at And the standard deviation is 6. So one standard deviation above and below is going to be 6.
If we go 6. Right, if we add 6, it'll get us to So that's one standard deviation below and above the mean, and then you'd add another 6. So that's a drawing of the distribution itself. So let's figure out the z-scores for each of these grades.
So we first want to say, well how far is it just from our mean? So the distance is, you just want to positive number here.
Well actually, you want a negative number. Because you want your z-score to be positive or negative. Negative would mean to the left of the mean and positive would mean to the right of the mean.
So we say 65 minus So that's literally how far away we are.Course Ratings are calculated from individual students’ ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course quality fairly and accurately.
Table F The t Distribution Confidence intervals 50% 80% 90% 95% 98% 99% One tail, d.f. Two tails, Instead of using a simple lifetime average, Udemy calculates a course's star rating by considering a number of different factors such as the number of ratings, the age of ratings, and the likelihood of fraudulent ratings.
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On the other end of the scale, you can also get a flat distribution. With this shape, the odds of anything happening are equal. For example, a uniform distribution can represent choosing a particular card from a standard deck; all the cards have a 1/52 chance of being chosen.
Or tossing a coin, where you have a 50% chance of tossing a heads or a tails.
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