ECO578 Spring 2018 Page 3 of 13 Part B: True or False(14-25) 14. In a frequency

Question

ECO578 Spring 2018 Page 3 of 13 Part B: True or False(14-25) 14. In a frequency distribution, the class mark is the number of observations that fall within that class. 15. The sum of the class frequencies is equal to the number of observations made 16. There would be no need for statistical theory if census , rather than a sample was always used to 17. Systematic, stratified and cluster sampling are not approximations to simple random sampling. 18. Sturges' rule is used to determine whether a frequency distribution can be constructed for a given set obtain information about populations. of data. 19, P(A n B) 0 means that A and B are mutually exclusive events. 20. Mutually exclusive events imply that if one event occurs, the other cannot occur. An event (e.g..A) and its complement are always mutually exclusive. 21, when events are independent, the multiplication rule is: P(A n B) = P(A) * P(B) 22, Rule ofaddition when event are mutually exclusives: P(A U B) = P(A) + P(B) Events are dependent when the occurrence of one event changes the probability that another will 24. Events are independent when the occurrence of one event has no effect on the probability that 25.The P(x) is always 0 s P(x) s 1. occur. another will occur.

Explanation / Answer

Ans:

14)True

15)True

16 )False(as a census may not be practical and is almost never economical.)

17)True

18)False

Sturge's Rule.: A rule for determining number of. classes to use in a histogram or frequency distribution table. Sturge's Rule: k = 1 + 3.322(log10 n), k is the number of classes, n is the size of the data

19)True

20)True

21)True

22)True

23)True

24)True

25)True

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