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Section 2.1 - Effingham County Schools
Section 2.1 - Effingham County Schools

... Roger Maris hit 61 in 1961, Mark McGwire hit 70 in 1998 and Barry Bonds hit 73 in 2001. In an absolute sense, Barry Bonds had the best performance of these four players, since he hit the most home runs in a single season. However, in a relative sense this may not be true. To make a fair comparison, ...
z-scores
z-scores

...  We would look in the chart and find that .4370 fall between the mean and z, such that we can say that the raw score of 123 is at the 93.7th percentile. However, the question was probability, so we look at the tail and find .0630, so that the probability of a score of 123 or higher occurring is onl ...
Chapter 7
Chapter 7

... Symmetrical bell-shaped (unimodal) density curve How is this done Above the horizontal axis mathematically? N(m, s) The transition points occur at m + s (Points of inflection) 5. Probability is calculated by finding the area under the curve 6. As s increases, the curve flattens & spreads out 7. As s ...
Exam Name___________________________________
Exam Name___________________________________

... Use the least common multiple or greatest common factor to solve the problem. ...
The Normal Distribution
The Normal Distribution

... about he mean, which is equivalent to saying that its shape is the same on both sides of a vertical line passing through the center.  The curve is continuous, that is, there are no gaps or holes. For each value of x, there is a corresponding y-value ...
Random Field Theory
Random Field Theory

... unsuitable because of spatial correlation – But also because of controlling something completely different from what we need – Suitable for different, independent tests, not continuous image – Couldn’t we think of each voxel as independent sample? ...
Examining Distributions
Examining Distributions

... prescribed manner for study. ...
Review lecture 1
Review lecture 1

... prescribed manner for study. ...
Business Statistics for Managerial Decision
Business Statistics for Managerial Decision

... prescribed manner for study. ...
Statistical Terms Quiz by Laura King, MA, ELS
Statistical Terms Quiz by Laura King, MA, ELS

... 19. Which of the following terms means the probability of developing an outcome  within a specified period if the risk factor is present, divided by the probability of  developing the outcome in that same period if the risk factor is absent?  ...
Math 1125-Introductory Statistics — Lecture 17 10/11/06 1. Normally
Math 1125-Introductory Statistics — Lecture 17 10/11/06 1. Normally

... This x-score, x = 4.0 is larger than the mean, so it will have a positive z-score, and it will lie to the right on the normal curve. As always, you should draw a picture, and the picture for this problem looks like Figure 1. We’re interested in the probability of x-scores to the right of x = 4.0. Th ...
Measures of Central Tendency
Measures of Central Tendency

... A study is done to determine the number of accidents that a student has been involved in. A sample of 50 students is done with the results that follow 6 have been in zero accidents 29 have been in 1 accident 12 have been in 2 accidents 3 have been in 3 accidents None have been in more than 3. Find ...
Logistic regression
Logistic regression

... Regression can be used on categorical responses to estimate probabilities and to classify. In recent columns we showed how linear regression can be used to predict a continuous dependent variable given other independent variables1,2. When the dependent variable is categorical, a common approach is t ...
Reading 4.7
Reading 4.7

... 5. Write the transformed function, g(x), if f (x) = ln x is translated 7 units left. 6. Write the transformed function, g(x), if f (x) = ex is reflected over the y-axis. 7. Write the transformed function, g(x), if f (x) = log x ...
stata4.regression
stata4.regression

... • Post Cox regression options – estat concordance: Calculate Harrell's C – estat phtest: Test Cox proportional-hazards assumption – stphplot: Graphically assess the Cox proportional-hazards assumption – stcoxkm: Graphically assess the Cox proportional-hazards assumption ...
Chapter 7 Frequently Asked Questions
Chapter 7 Frequently Asked Questions

... z-score) we know that it will be the mirror image on the right side. So our other z-score is +1.25 (there’s no need to actually calculate it). However, just to prove that to you, let’s figure out what the area to the left of that z-score would be. 79% (shaded) + 10.5% (in left tail) = 89.5% to the l ...
6.4 The Standard Normal Distribution
6.4 The Standard Normal Distribution

... for a normally distributed random variable. How to use a TI-83 or TI-84 graphing calculator to find an area on a density curve that represents a probability for a normally distributed random variable: • Press 2nd and then Vars (to get the DISTR menu) • Select normalcdf( (WARNING never select normalp ...
Chapter 1: Looking at Data Section 1.1: Displaying Distributions with
Chapter 1: Looking at Data Section 1.1: Displaying Distributions with

... i. Symmetric: median is approximately equal to the mean  ii. Right Skewed: Median mean  1. Long tail to the left  2.) Center: defined by the middle value or average value.  a. Mode: The measurement value that occurs most often.  b. Median:  ...
Chapter5
Chapter5

... to create several datasets of the desired size • Need to re-use data if that is not the case • E.g., running cross-validations with different randomizations on the same data ...
Statistics Statements
Statistics Statements

... Although calculating the mean using the information in the table suggests that the mean is 141.3 mins, this is not an exact value but an estimate due to the grouped data and the use of the midpoint to calculate the mean. A different set of groups and thus midpoints may give a different estimate of t ...
predictY
predictY

... Mean of Lat = 39.533 ...
Document
Document

... 8. If a meteor hits the earth it is called a meteorite. ...
Slides (PPT) - University of Oxford
Slides (PPT) - University of Oxford

... • If we knew distribution of negative scores, we could do a hypothesis test for each positive score using that distribution. • Unfortunately, we don’t know anything about overall negative distribution. ...
Chapter 5: The standard deviation as a ruler and the normal model
Chapter 5: The standard deviation as a ruler and the normal model

... Those exam scores above: Which is the better exam score? − 67 on an exam with mean 50 and SD 10 − 62 on an exam with mean 40 and SD 12? Turn them into z-scores: − 67 becomes (67-50)/10=1.70 − 62 becomes (62-40)/12=1.83 so the 62 is a (slightly) better performance, relative to the mean and SD. ...
standard deviation and its relation with strength of concrete
standard deviation and its relation with strength of concrete

... We generally represent standard deviation by the notation σ (sigma). In a normal distribution curve, the possibility is that about 68.26% of the values are within –σ and +σ. For example, if the mean value of a number of samples is 100 and standard deviation is calculated as, say, 6, then 68.26% of a ...
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Receiver operating characteristic

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