STAT 5.6 difference of 2 proportions

Front

What is the difference of two proportions?

Back

The difference of two proportions refers to the comparison of the proportions of a certain characteristic in two different groups. It is calculated as p1 - p2, where p1 is the proportion from the first group and p2 is the proportion from the second group.

Front

What is a sampling distribution?

Back

A sampling distribution is the probability distribution of a statistic (like a sample mean or sample proportion) obtained from a large number of samples drawn from a specific population.

Front

What is the Central Limit Theorem?

Back

The Central Limit Theorem states that the sampling distribution of the sample mean (or sample proportion) will be approximately normally distributed if the sample size is sufficiently large, regardless of the population's distribution.

Front

What is the formula for the standard deviation of the difference of two proportions?

Back

The standard deviation of the difference of two proportions is calculated using the formula: sqrt[(p1(1-p1)/n1) + (p2(1-p2)/n2)], where p1 and p2 are the sample proportions and n1 and n2 are the sample sizes.

Front

What does it mean if the sample sizes are large enough?

Back

Sample sizes are considered large enough if both np and n(1-p) are greater than 5 for each group, which allows the sampling distribution of the difference in proportions to be approximately normal.

Front

What is a null hypothesis in the context of comparing two proportions?

Back

The null hypothesis states that there is no difference between the two population proportions (p1 = p2). It is the hypothesis that is tested in statistical analysis.

Front

What is a p-value?

Back

A p-value is the probability of obtaining a test statistic at least as extreme as the one observed, assuming that the null hypothesis is true. It helps determine the significance of the results.

Front

What does it mean if P(PA−PB>0)≈0.022?

Back

It means that in about 2.2% of random samples, the sample proportion of adults who prefer pop music will be greater than the sample proportion of students who prefer pop music.

Front

How do you interpret a confidence interval for the difference of two proportions?

Back

A confidence interval for the difference of two proportions provides a range of values that is likely to contain the true difference between the population proportions, with a specified level of confidence (e.g., 95%).

Front

What is the significance of a normal distribution in statistics?

Back

A normal distribution is significant because many statistical methods assume that the data follows a normal distribution, which allows for the application of various statistical tests and confidence intervals.