An operation that produces a scalar value from an array of values is called

		A pivot
		A cross tabulation
		A transformation
		An aggregation

In most computers, timestamp values are usually stored in terms of nanoseconds since which reference point?

		December 31st, 1 B.C.
		The UNIX epoch (January 1st, 1970)
		January 1st, 2001
		Januray 1st, 1 A.D.

A large decay factor in exponentially-weighted functions results in more weight being given to older observations.

True

False

A moving window function takes an array of values and produces a single scalar value.

True

False

The sort method of a Series object performs an in-place sorting of the values of the Series.

True

False

If the seed value is always the same, a pseudo-random number generator will always produce the same sequence of numbers.

True

False

A pseudo-random number generator will produce an infinite sequence of numbers which never repeat themselves.

True

False

Python function definitions must begin with the def keyword and must have a return statement.

True

False

Assume you have data consisting of two numeric attributes: temperature and distance. There are many temperature values for the same distance value and vice versa. Which of the following would be the most natural visualization of this data?

		Line plot
		Bar graph
		Pie chart
		Scatter plot

What is a magic command?

		A command line program executed within the IPython environment.
		A command that generates pseudo-random numbers.
		A command that does magic.
		Any Python function

Which of the following formats is a standard format for sending data by HTTP requests between web browsers and other applications?

		JSON
		CSV
		HDF5
		SQL

A pivot operation on a DataFrame can be implemented by using set_index and unstack.

True

False