summary statistics - NYU Stern School of Business
... If rxy = 0, then there is a complete absence of a straight-line relationship between the x’s and the y’s. A plot of the data would show aimless scatter, though it occasionally happens that a non-linear (curved) relationship corresponds to a correlation of zero. In practice, sample correlations are r ...
... If rxy = 0, then there is a complete absence of a straight-line relationship between the x’s and the y’s. A plot of the data would show aimless scatter, though it occasionally happens that a non-linear (curved) relationship corresponds to a correlation of zero. In practice, sample correlations are r ...
6_1a Random Variables and Expected Value
... The probability of a random variable is an idealized relative frequency distribution. Histograms and density curves are pictures of the distributions of data. When describing data, we moved from graphs to numerical summaries such as means and standard deviations. ...
... The probability of a random variable is an idealized relative frequency distribution. Histograms and density curves are pictures of the distributions of data. When describing data, we moved from graphs to numerical summaries such as means and standard deviations. ...
Lecture 3: Statistical sampling uncertainty
... normal distribution with mean zero and standard deviation 1, with different lag-1 autocorrelations r. In each case, the p sample mean is shown as the red dashed line and the magenta lines x ± σx / (N ∗ ) give a ±1 standard deviation uncertainty range of x as an estimate of the true mean of the distr ...
... normal distribution with mean zero and standard deviation 1, with different lag-1 autocorrelations r. In each case, the p sample mean is shown as the red dashed line and the magenta lines x ± σx / (N ∗ ) give a ±1 standard deviation uncertainty range of x as an estimate of the true mean of the distr ...
Lecture 13 notes for October 10, 2008
... defined in the book, but most books say that n=30 is large enough. We will use 40. Figure 11.4 on page 282 shows a right skewed distribution of earned income in top panel. The second panel shows the distribution of XBAR’s when n=100. The third panel shows the second panel with the horizontal scale e ...
... defined in the book, but most books say that n=30 is large enough. We will use 40. Figure 11.4 on page 282 shows a right skewed distribution of earned income in top panel. The second panel shows the distribution of XBAR’s when n=100. The third panel shows the second panel with the horizontal scale e ...
Binomial Distribution
... the independence assumption is not of great concern. Therefore the acceptable sample size for using the binomial distribution with samples taken without replacement is [n<5% N] where n is equal to the sample size, and N stands for the size of the population. The birth of children (male or female), t ...
... the independence assumption is not of great concern. Therefore the acceptable sample size for using the binomial distribution with samples taken without replacement is [n<5% N] where n is equal to the sample size, and N stands for the size of the population. The birth of children (male or female), t ...
Analyzing Statistical Inferences: A Review
... – No differences between groups – No relationships between variables ...
... – No differences between groups – No relationships between variables ...
