Retailing and Large Online Retailers

Problem set 3 Crystal Yu 1. Do botheration 4.8 and 4.9 pages 149 (2 points) You charge to appearance your assignment to get credit. Does it booty added time to be removed from an email account than it acclimated to take? A abstraction of 100 ample online retailers appear the following: Charge Three Or Added Clicks to Be Removed Year Yes No Total 2009 39 61 100 2008 7 93 100 46 154 200 a. Give an archetype of a simple event Need beneath than 3 added clicks to be removed. b. Give an archetype of a collective event Need three or added clicks to be removed in 2008 (2 events: needs 3 or added clicks and happened in 2008) c. What is the accompaniment of "Needs three or added clicks to be removed from an email list"? Charge beneath than 3 added clicks. d.Why is "Needs three or added clicks to be removed from an email account in 2009" a collective event? It needs to fit both criteria, 3 or added clicks and action in the year 2009 Referring to the accident table in Botheration 4.8, if a ample online banker is called at random, what is the anticipation that a. you bare three or added clicks to be removed from an email list? P = 46/200 = 23% b. you bare three or added clicks o be removed from an email account in 2009? P = 39/200 = 19.5% c. you bare three or added clicks to be removed from an email account or were a ample online banker surveyed in 2009? Let say accident A = "needed three or added clicks to be removed from an email list" --> P(A) = 23% Let say accident B = "were a ample online banker surveyed in 2009" ---> P(B) = 100/200 = 50% So P(A or B) = P(A) + P(B) - P(A and B) = 23% + 50% - 19.5% = 53.5% d. Explain the aberration in the after-effects in (b) and (c). 2. Do botheration 4.21 folio 157 (2 points) You charge to appearance your assignment to get credit. Table Year Yes No Total 2009 39 61 100 2008 7 93 100 46 154 200 a. Accustomed that three or added clicks are bare to be removed from an email list, what is the anticipation that this occurred in 2009? There were 46 retailers surveyed in two years that charge three or added clicks to be removed, 39 of them happened in 2009 --> So P = 39/46 = 84.78% b. Accustomed that the year 2009 is involved, what is the anticipation that three or added clicks are bare to be removed from an email list? Of 100 retailers surveyed in 2009, 39 charge there or added clicks to be removed ---> So P = 39/100 = 39% c. Explain the aberration in the after-effects in (a) and (b). Results in (a) and (b) are altered because the altitude are different. Action of (a) agency for those retailers that “needed three or added clicks to be removed” how abounding were surveyed in 2009. While the action of (b) means the adverse way, for those surveyed in 2009, how abounding retailers charge 3 or added clicks. d. Are defective three or added clicks to be removed from an email account and the year independent? They are not independent. Refer to Equation 4.5 in the textbook, p.154 shows that two contest A and B are absolute if and alone if P(A?B) = P(A) Calculate the probabilities of the contest : P(need three or added clicks to be removed) = 46/200 = 23% P(need three or added clicks to be removed accustomed the action that occurred in 2009) = 39% Chapter 6 Individual work Using a Normal Distribution to acquisition probabilities: You may use the tables in your argument or PhStat – Anticipation Distributions – Normal. Regardless of which adjustment you use, either draw a account and announce what probabilities (formulas such as P(X10 for example) for what is appropriate for anniversary allotment of the problem. 3. Do botheration 6.9 Folio 214 (2 points) Remember, you charge sketches to get credit. Mean: $21 Standard deviation: $5 a.Find anticipation that a about called being will absorb added than $25 Z = ($25 - $21)/$5 = 0.8 Shows anticipation of Z = 0.8 is 0.7881 acceptation 78.81% a called being will absorb $25 or less. So the anticipation that a about called being will absorb added than $25 is 21.19% (100% - 78.81% = 21.19%) b. Acquisition the anticipation that a about called being will absorb amid $10 and $20. Z($10) = ($10 - $21)/$5 = - 2.2 ? P(X

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