
Non-Parametric Statistics
... many samples could have come from the same population. This test can also tell you about the differences between two or more areas. For example, if a survey is conducted in many different towns, you can see if their average responses differ significantly. Similarly, you can take samples of plant gro ...
... many samples could have come from the same population. This test can also tell you about the differences between two or more areas. For example, if a survey is conducted in many different towns, you can see if their average responses differ significantly. Similarly, you can take samples of plant gro ...
The Analysis of Natural Populations
... average for the species. So, if you have measured the lengths of a sample of red foxes, you can say that the red fox (Vulpes fulva) has an average length of perhaps 89 cm. You may also mention the maximum and minimum lengths you measured, called the range, and say that the red fox varies in length f ...
... average for the species. So, if you have measured the lengths of a sample of red foxes, you can say that the red fox (Vulpes fulva) has an average length of perhaps 89 cm. You may also mention the maximum and minimum lengths you measured, called the range, and say that the red fox varies in length f ...
Review of Basic Statistical Concepts
... Cumulative Probabilities for any normal random variable X, i.e., P(X x), are easy to find in Excel. Follow: fx > Statistical > NORMDIST and enter TRUE in the Cumulative field. Probabilities of the form P(X > x) or P(a < X < b) can be obtained by subtraction. ...
... Cumulative Probabilities for any normal random variable X, i.e., P(X x), are easy to find in Excel. Follow: fx > Statistical > NORMDIST and enter TRUE in the Cumulative field. Probabilities of the form P(X > x) or P(a < X < b) can be obtained by subtraction. ...
Chapter 21: Two-Sample Problems Comparing means of two
... The goal of inference is to compare the responses to two treatments or to compare the characteristics of two populations. Test: the claim that subjects treated with Lipitor have a mean cholesterol level that is lower than the mean cholesterol level for subjects given a placebo. ...
... The goal of inference is to compare the responses to two treatments or to compare the characteristics of two populations. Test: the claim that subjects treated with Lipitor have a mean cholesterol level that is lower than the mean cholesterol level for subjects given a placebo. ...
Chapter 7: The One-Sample t Test and Interval Estimation
... Sometimes proving that the null should be rejected isn’t enough, as it just tells us that one particular point is not likely to be the parameter of the data we found. So when you want additional information, it’s time to turn to confidence intervals (CIs). These bad boys will provide, with varying a ...
... Sometimes proving that the null should be rejected isn’t enough, as it just tells us that one particular point is not likely to be the parameter of the data we found. So when you want additional information, it’s time to turn to confidence intervals (CIs). These bad boys will provide, with varying a ...
Lecture #9 Chapter 9: Inferences from two samples In this chapter
... 9-2 Inferences about two proportions: In this section, we learn how to use a z-test to test the difference between two population proportions. Suppose a simple random sample of size n1is taken form a population where x1of the individuals have a specified characteristic, and a simple of size n2is ind ...
... 9-2 Inferences about two proportions: In this section, we learn how to use a z-test to test the difference between two population proportions. Suppose a simple random sample of size n1is taken form a population where x1of the individuals have a specified characteristic, and a simple of size n2is ind ...