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STA 301 - HW01 Key - STA 301 Applied Statistics Spring 2008...

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STA 301 – Applied Statistics Spring 2008, Section B Homework #1 - Key Due Friday, January 25 Question 1 : At the end of a semester, an instructor compiles his final grade distribution, resulting in the table below: Grade % Students A 25 B 30 C 25 D 15 F 5 This summary of class grades is an application of: Choose one: (a) descriptive statistics (b) inferential statistics Because there is no attempt to draw conclusions about a larger population outside the above data, this is a use of descriptive statistics. Question 2 : Census—pros and cons (a) What is a census? A sample containing the entire population (b) When might a census be useful? When the population of interest is small, for example (c) When might a census be a bad idea? When gathering population data is cost-prohibitive, either because of the method of collection or because of a large population size
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STA 301-B, Spring 2008 Homework 1 Key Page 2 of 3 Question 3 : A student would like to determine the average ACT score for incoming freshman at his school, but this information has not yet been published.
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