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Descriptive Statistics: Numerical Summaries and Plots

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Descriptive Statistics: Numerical Summaries and Plots

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Questions and Answers

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

Sample mean
Sample variance
Histogram
Population (correct)

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?

Probability plots
Frequency distributions
Time sequence plots
Stem-and-leaf diagram (correct)

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

Sample variance
Time sequence plots
Box plots (correct)
Sample standard deviation

What is used to explain the concept of random sampling?

Normal probability plots (C) Signup and view all the answers

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

Time sequence plots (B) Signup and view all the answers

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 (D) Signup and view all the answers

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

Mean (A) Signup and view all the answers

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

Standard deviation (A) Signup and view all the answers

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

Mean (B) Signup and view all the answers

What is the population mean symbol?

$μ$ (A) Signup and view all the answers

Which term refers to the balance point in a sample?

Mean (D) Signup and view all the answers

What is the formula for calculating the sample variance?

$s^2 = \frac{1}{n-1} \sum_{i=1}^{n} (x_i - \bar{x})^2$ (A) Signup and view all the answers

What is the symbol for population standard deviation?

$σ$ (C) Signup and view all the answers

What units are the same as the standard deviation?

$\mu$ (C) Signup and view all the answers

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

$s$ (C) Signup and view all the answers

What formula is used to calculate the population variance?

$rac{1}{N} \[ \[ \] \]$ \sum_{i=1}^{N} (x_i - μ)^2 f(x_i) (D) Signup and view all the answers