La Guardia Community College Fall 2017 Name: Proft Faouzi Abousalham Math 120 Ex
ID: 3329879 • Letter: L
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La Guardia Community College Fall 2017 Name: Proft Faouzi Abousalham Math 120 Exam 1 Show all your work for your credits Question 1: (S points) Determine whether the underlined value is a parameter or a statistic a) The average score for a class of 28 students taking a calculus midterm exam was 72 Interviews of 100 adults 18 years of age or older, conducted nationwide, state the minimum age required for the office of U.S. president. b) found that 44% could Question 2: (5 points) Classify the variable as gualitative or quantitative. a) Phone number. b) Student ID number. uestion 3: (5 points) etermine whether the quantitative variable is discrete or continuous a) Number of Sequoia trees in a randomly selected acre of Yosemite National Park. b) Internet connection speed in Kilobytes.Explanation / Answer
(1) The difference between a statistic and a parameter is that statistics describe a sample where as a parameter describes an entire population.
(a) Here 72% describe average score of entire class i.e. population so, it is a parameter.
(b) Here 44% is a statistic as it is describing about a sample of 100 adults taken from a large population.
(2) (a) Phone number is an example of quantitative because each number assigned to a person or household has to be different.
(b) Student ID number is an example of qualitative variable as it is equivalent to a name for that student. The numerical digits in a student number are not intended to indicate the measure or size or amount of something that that student has.
(3) (a) It is a discrete variable as we can count the exact value of number of Sequoia tree in a randomly selected acre of Yosemite National Park and discrete variables has a countable number of possible values.
(b) Internet connection speed in kilobytes is continuous as it can have infinite number of possible values which is the property of continuous variable.
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