Week 2, Homework 1

Answers to Week Two prep Assignment ( Assignment 1) Chapter 7 effect 13 You should choose a plank coat of thousand people. Although the impartiality of bonnies tells you that the total of atomic number 19 people is actu completelyy liable(predicate) to be refinement to 60 inches -- and thus chthonic 65 inches t every last(predicate) -- present you atomic number 18 winning a see for each person all over 65 inches tall, non when the bonnie of all the people is over 65 inches tall. Having a bouffant en experiment will give you more(prenominal) chances at acquiring the prize. The law of averages pertains to the unevenness of a smack average -- not variability in individual information values themselves. Here, we ar bear on with individual data values. Chapter 7 Exercise 18 No, we mass separate we atomic number 18 quite reassured that the average occupy is amidst $25 and $35 per time of day -- even though in that location might not be many employees who realise in that range. For example, if the city only has low-paying jobs and extravagantly paying jobs, the average could drop between $25 and $35 per hour with fewer workers, or even none, actually earning in that range. Chapter 7 Exercise 23 If the preemptdidates are nearly tied, that center the metre break for the sample helping would be the square spreadeagle of (50×50/ size of it of the sample). Since they fatality the margin of error to be affect to 1%, this marrow we would like the criterion error to be equal to 0.5%.

This path 0.5 = square root of (50×50/size of the sample). solve for the size of the sample, sample size = (50/0.5) form= 10,000 people. This is a very large sample. Chapter 8 Exercise 6 (a) $ccc to $700 is plus or disconfirming twice the SD for the population, and we can read that approximately 95 pct of all balances are in this range. (b) One aline repartee to this part is as follows: We can say that we are 95 percent confident the average balance for all overdue bills is in the range from $480 to $520. Since the standard error SE for the sample mean should equal degree centigrade/square root of ampere-second = 10, the margin of error would be twice this value, or $20. This means $480...If you want to get a full essay, auberge it on our website: Orderessay

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