All of the Following Project or System Breakdowns Occurred as a Result

question 6

Multiple Choice

All of the following project or system breakdowns occurred as a result of software errors, except:

• A) the 9-hour failure of the AT&T long-distance network in 1990.
• B) massive radiation overdoses by Therac-25 radiation therapy machines between 1985 and 1987.
• C) a U.S. Patriot Missile battery's failure to track and intercept an incoming Iraqi Scud missile that killed and injured American troops in Saudi Arabia during the Persian Gulf War in 1991.
• D) the Mars Climate Orbiter entering the Martian atmosphere about 100 kilometers lower than expected, causing the craft to burn up.
• E) periodically miscalculated spreadsheet data completed on computers manufactured by IBM, Compaq, Dell, Gateway 2000, and other IBM-compatible PCs beginning in 1994.

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Definitions:

Test Statistic

A value calculated from sample data during a hypothesis test, used to determine whether to reject the null hypothesis.

Number of Participants

Refers to the total count of individuals involved in a study or experiment, providing a base for drawing conclusions.

T Test

A statistical test used to compare the means of two groups to see if they are significantly different from each other.

Pairs of Observations

Two related data points collected from a study that are analyzed together to understand correlations or differences.