# How do you extrapolate with only 2 data points?

you're not meant to.

But, if you have to,

let's say the first data point is (w,x) and the second is (y,z), the nth point will be equal to:

(w+n(y-w),x+n(z-x))

### How do you work out speed using mean and median?

Mean is the average of a set of data points = (Sum of all data) / Quantity of Data Median is the middle of a set of data points = Data whose index is the integer nearest ((Number of Data+1) / 2) Example Data: 2, 3, 5, 3, 2 The mean = (2+3+5+3+2)/5 = 15/5 = 3 The median = Index((5+1)/2) = Index(6/2) = Index(3). The third item on our list is 5.

### What is the TRIMMEAN function for in Excel?

TRIMMEAN calculates the mean taken by excluding a percentage of data points from the top and bottom ends of a data set. You can use this function when you wish to exclude outlying data from your analysis. =TRIMMEAN(array, percent) Array is the array or range of values to trim and average. Percent is the fractional number of data points to exclude from the calculation. For example, if percent = 0.2, 4 points are trimmed from…

### What is a standard deviation?

Standard deviation is a statistical tool used to determine how tight or spread out your data is. In effect, this is quantitatively calculating your precision, the reproducibility of your data points. Here's how you find it: 1). Take the average of all the data points in your set. 2). Find the deviation of each point by finding the difference between each data point and the mean. 3). Add the squares of each deviation together. 4)…

### How do find the interquartile range in your data?

Arrange the data in increasing order and count the number of data points = N. Find the integer K = N/2 or (N+1)/2. The Kth number in the ordered set is the median. Now consider only the numbers from the smallest to the median and find the median of this subset. This is the lower quartile = Q1. Then consider only the numbers from the original median to the largest. Find the median of this…

### What three points determine a pane?

Any 3 geometric points, as long as they are all in different locations and not superimposed on each other, will define a plane. In other words, there is only one plane that can pass through 3 distinct points. If you had only two points, it would define a line, but not a plane. A plane can include 2 points but if there are only 2 that are specified, the plane can rotate around those 2…

### What are 3 states of data for protection?

1. Moving Data (Traffic) 2. Data at rest (Databases etc.) 3. Data at End-Points (USB-Sticks, CD/DVD etc.) Used in DLP (Data Loss Prevention). For example: Data at rest must be protected most carefully, moving data must be constantly monitored. Data at End-Points is harder to control and has proven to be the most likely reason for loss of confidential data (e.g. a staff members copies data on a CD) because it's not that easy to…

### How do you find the equation for the line of best fit?

There are many ways, but probably you aren't in a statistics class, but in an algebra class. Step 1 plot all the data points on a coordinate plane graph (x-y graph) Step 2 estimate a line 'close' to points. Step 3 use 2 points ON THE LINE (these do not need to be data points) Step 4 find slope of line using points from step 3 Step 5 use point-slope formula to write the equation.

### How do you determine the lowest quartile of a series of numbers?

Rank them from highest to lowest. The lowest 25 percent of them represent the bottom quartile. Let's say you have the following data set: 1, 8, 2, 7, 3, 6, 4, 5 Rank them thus: 1, 2, 3, 4, 5, 6, 7, 8 Twenty-five percent of eight (the number of data points) is two. Therefore, the bottom two data points (1 and 2) represent the bottom quartile.

### What is ordinal research?

In the social sciences, the ordinal model of gathering data has identity and magnitude. It's ranked by order, but not amount (i.e. the differences between all the data points on a list might not be equidistant). For example, class rank or GPA; the #1 person in the class might only have gotten a 4.0, the #2 person got a 3.95, and the #3 person got a 3.80.

### Why is the standard deviation one?

The standard deviation provides in indication of what proportion of the entire distribution of the sample falls within a certain distance from the mean or average for that sample. If your data falls on a normal (or bell shaped) distribution, a SD of 1 indicates that about 68% of your data points (scores or whatever else) fall within 1 point (plus or minus) of the average (mean) of the data, and 95% fall within 2…

### Do you need more than 10 observations in linear regression?

This is a difficult question to answer. The pure answer is no. In reality, it depends on the level of randomness in the data. If you plot the data, it will give you an idea of the randomness. Even with 10 data points, 1 or 2 outliers can significantly change the regression equation. I am not aware of a rule of thumb on the minimum number of data points. Obviously, the more the better. Also…

### What is the value that falls in the middle position when the data is arranged in order from smallest to largest?

That's the median. (It is also the 50th percentile.) Exactly half the data lie above the median and half lie below it. For example, consider the following list of numbers: 4, 2, 6, 7, 3, 8, 9. Arranging the numbers from least to greatest, we get: 2, 3, 4, 6, 7, 8, 9. The number 6 is in the middle, so 6 is the median of the data set. If the number of data points…