Assignment 1

2943 Words Oct 23rd, 2014 12 Pages
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
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6. If there are 80 values in a data set, how many classes should be created for a frequency histogram? A. 4B. 5C. 6D. 7E. 8
Just apply the 2k rule for question 8.
7. Consider the following frequency distribution from Excel. What is the missing value?
BinFrequencyCumulative %
58414.00%
1774.464.00%
2964.8480.00%
4155.2392.00%
5345.6196.00%
More1100.00%
4
10
12
15
20
Chapter 38. In a statistic class, 10 scores were randomly selected with the following results obtained: 75, 74, 77, 77, 71, 70, 65, 78, 67, and 66. What is the Standard deviation? A. 21.40B. 23.78C. 4.88D. 4.63E. 214.00
X X – (X-bar) (X-Xbar)2
75 3 9
74 2 4
77 5 25
77 5 25
71 -1 1
70 -2 4
65 -7 49
78 6 36
67 -5 25
66 -6 36
720 0 214 s2x = 214 / (10 – 1) = 23.78 sx = √23.78 = 4.88
9. According to a survey of the top 10 employers in a major city in the Midwest, a worker spends an average of 413 minutes a day on the job. Suppose the standard deviation is 26.8 minutes and the time spent is approximately a normal distribution. What are the times that approximately 95.45% of all workers will fall? A. [387.5 438.5]B. [386.2 439.8]C. [372.8 453.2]D. [359.4 466.6]E. [332.6 493.4]
10. When using the Chebyshev's theorem to obtain the bounds for a 99.73 percent of the values in a population, the interval generally will be ___________ the interval obtained for the same percentage if normal distribution is assumed (empirical rule).

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