# Descriptive Statistics: Numerical Summaries and Plots

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## 16 Questions

Population

### Which visual data display can be used to construct and interpret visual data displays, including the stem-and-leaf display, the histogram, and the box plot?

Stem-and-leaf diagram

Box plots

### What is used to explain the concept of random sampling?

Normal probability plots

### What is used to visually display the important features of time-oriented data?

Time sequence plots

### Which measure is used to compute and interpret the sample mean, sample variance, sample standard deviation, sample median, and sample range?

Numerical summaries of data

Mean

### Which parameter is used to measure the spread of a population?

Standard deviation

Mean

### What is the population mean symbol?

$μ$

Mean

### What is the formula for calculating the sample variance?

$s^2 = \frac{1}{n-1} \sum_{i=1}^{n} (x_i - \bar{x})^2$

### What is the symbol for population standard deviation?

$σ$

### What units are the same as the standard deviation?

$\mu$

### Which parameter is used to measure the spread of a sample?

$s$

### What formula is used to calculate the population variance?

$rac{1}{N} $\[$ \]$ \sum_{i=1}^{N} (x_i - μ)^2 f(x_i)

Explore the numerical summaries and graphical representations of data in this chapter outline. Learn to compute and interpret sample mean, variance, standard deviation, median, range, and explore stem-and-leaf diagrams, frequency distributions, histograms, box plots, time sequence plots, and probability plots.

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