3. Describing Data Numerically

Which of the following statements is true of the $standarddeviation$?

If a dataset has a sample variance of $6$, what is the sample standard deviation?

Given the sample data set: $7$, what is the standard deviation of this sample?

Which of the following best explains why the $\mathrm{range}$ is less desirable than the $\mathrm{standard\; deviation}$ as a measure of dispersion?

For a bell-shaped data set, approximately what percentage of the data will be in the interval $\mu -\sigma$ to $\mu +\sigma$?

Which one of the following is the positive square root of the $\mathrm{variance}$?

In the context of statistics, how can the $s=\sqrt{\frac{\sum {x-\mu }^2}{n}}$ (standard deviation) be used to specify uncertainty in a set of measurements?

According to the range rule of thumb, the standard deviation of a data set can be roughly estimated as which of the following expressions?

Regarding measures of variability, which of the following statistics can take on negative values?

Given a population with mean $\mu$ = $40$ and standard deviation $\sigma$ = $8$, what is the z-score of a value $x=56$?

Which of the following symbols identifies the sample variance?

Which of the following sets of data will have the smallest $standarddeviation$?

If the standard deviation for a set of data is $0$, what does this indicate about the data values?

Which characteristic of data is a measure of the amount that the data values vary?

In a normal distribution, approximately what percentage of data falls below a value that is $3-\sigma$ below the mean $\mu$?