Semester 1 Mixed Review

Front

What is the interquartile range (IQR)?

Back

The interquartile range (IQR) is a measure of statistical dispersion, representing the range of the middle 50% of a dataset. It is calculated as the difference between the third quartile (Q3) and the first quartile (Q1).

Front

How do you interpret the median in a dataset?

Back

The median is the middle value of a dataset when it is ordered from least to greatest. It divides the dataset into two equal halves, with 50% of the values below it and 50% above it.

Front

What does it mean if the median is less than the mean?

Back

If the median is less than the mean, it indicates that the distribution of the data is positively skewed, meaning there are some higher values that are pulling the mean up.

Front

What is variability due to sampling?

Back

Variability due to sampling refers to the natural fluctuations in sample statistics that occur when different samples are taken from the same population. This can lead to differences between observed and expected results.

Front

What is a boxplot and what does it represent?

Back

A boxplot is a graphical representation of a dataset that displays its median, quartiles, and potential outliers. It provides a visual summary of the distribution and variability of the data.

Front

What is the significance of outliers in a dataset?

Back

Outliers are data points that differ significantly from other observations. They can indicate variability in the data, measurement errors, or novel phenomena, and can affect statistical analyses.

Front

What does a probability of 0.17 indicate in a statistical context?

Back

A probability of 0.17 indicates that there is a 17% chance of the event occurring. In the context of sampling, it suggests that the event is relatively unlikely but still possible.

Front

What is the purpose of regression analysis?

Back

Regression analysis is used to understand the relationship between variables, allowing predictions about one variable based on the values of others. It helps in identifying trends and making informed decisions.

Front

What is the definition of a simple random sample?

Back

A simple random sample is a subset of individuals chosen from a larger set, where each individual has an equal chance of being selected. This method helps ensure that the sample is representative of the population.

Front

How do you calculate the mean of a dataset?

Back

To calculate the mean, sum all the values in the dataset and then divide by the number of values. The mean provides a measure of central tendency.