## 16 Questions

What is the totality of all observations of a phenomenon of interest?

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

What is the concept used to visually compare two or more samples of data?

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

What is the measure used to describe the center of a collection of data?

Mean

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

Standard deviation

In a random sample, what is used to estimate the parameters of a population?

Mean

What is the population mean symbol?

$μ$

Which term refers to the balance point in a sample?

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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