Scores on a certain test follow the normal curve with an average of 1350 and a standard deviation of 120. What percentage of test takers score below 1230? (Use the empirical rule.) 16%, 1230 is one ...

The normal approximation to the binomial test with and without a continuity correction is evaluated in terms of control of Type I errors and power. The normal approximations are evaluated as robust ...

A recent comparative analysis of alternative interval estimation approaches and procedures has shown that confidence intervals (CIs) for true raw scores determined with the Score method—which uses the ...

Where \(X\) is a normally distributed random variable with mean \(\mu\) and standard deviation \(\sigma\). The peak of the curve occurs at \(x=\mu\), and the spread ...

Use the sliders to change the number of trials (n) and the probability of success (p). Use the checkboxes to see the normal approximation to the binomial distribution and to compute cumulative ...

The binomial distribution models the number of successes in a fixed number of independent Bernoulli trials. It's characterized by two parameters: n (number of trials) and p (probability of success on ...