Assignment 1
BA 578 Assignment-Sol- due by Midnight (11:59pm) Monday, Sept 15th, 2014(Chapters 1, 2, 3 and 4): Total 75 points
True/False (One point each)
Chapter 11. An example of a quantitative variable is the telephone number of an individual. FALSE
2. An example of a interval scale variable is the make of a car. FALSE
3. Credit score is an example of an interval scale variable. TRUE There is no intrinsic Zero. An arbitrary minimum is established. Therefore, it is an interval scale variable.
4. The number of people eating at a local café between noon and 2:00 p.m. is an example of a discrete variable. TRUE
Chapter25. When establishing the classes for a frequency table it is generally agreed that the more classes you use the better your frequency table will be. FALSE We try to follow the 2k rule. Having too many classes is not good.6. The cumulative distribution function is never decreasing. TRUE It is always increasing and becomes flat at the end point.7. A Histogram is a graphic that is used to depict quantitative data. TRUE Bar Chart is used for qualitative data.
Chapter 3
8. The Mean is the measure of central tendency that divides a population or sample into two equal parts (that is two parts with equal frequencies) FALSE It is the median which does that. 9. If there are 7 classes in a frequency distribution then the fourth class necessarily contains the median. FALSE It depends on the class frequencies 10. The sum of deviations from the mean (taking into account the frequencies) can be negative, zero or positive. FALSE It is always Zero
11. The median is said to be less sensitive to extreme values. TRUE This statement is a relative statement (implicitly) comparing Median with the other popular measure of central tendency, namely, the Mean. But some students read the statement in absolute terms and answered it wrong although they knew that Median is not sensitive to extreme values. Therefore, I removed this question from grading.
12. The Empirical Rule is
True/False (One point each)
Chapter 11. An example of a quantitative variable is the telephone number of an individual. FALSE
2. An example of a interval scale variable is the make of a car. FALSE
3. Credit score is an example of an interval scale variable. TRUE There is no intrinsic Zero. An arbitrary minimum is established. Therefore, it is an interval scale variable.
4. The number of people eating at a local café between noon and 2:00 p.m. is an example of a discrete variable. TRUE
Chapter25. When establishing the classes for a frequency table it is generally agreed that the more classes you use the better your frequency table will be. FALSE We try to follow the 2k rule. Having too many classes is not good.6. The cumulative distribution function is never decreasing. TRUE It is always increasing and becomes flat at the end point.7. A Histogram is a graphic that is used to depict quantitative data. TRUE Bar Chart is used for qualitative data.
Chapter 3
8. The Mean is the measure of central tendency that divides a population or sample into two equal parts (that is two parts with equal frequencies) FALSE It is the median which does that. 9. If there are 7 classes in a frequency distribution then the fourth class necessarily contains the median. FALSE It depends on the class frequencies 10. The sum of deviations from the mean (taking into account the frequencies) can be negative, zero or positive. FALSE It is always Zero
11. The median is said to be less sensitive to extreme values. TRUE This statement is a relative statement (implicitly) comparing Median with the other popular measure of central tendency, namely, the Mean. But some students read the statement in absolute terms and answered it wrong although they knew that Median is not sensitive to extreme values. Therefore, I removed this question from grading.
12. The Empirical Rule is