QUESTION: 1137

Which of the following is/are true about a normal distribution?

It is a bimodal distribution.
II. It can be characterized completely by a single parameter.
III. It ranges from negative infinity to positive infinity.
IV. It is positively skewed.
I only
III only
IV only
II only
II, III and IV
II and III
III and IV

Answer(s): B

Explanation:

A normal distribution is completely characterized by 2 parameters, mean and variance. It ranges from negative infinity to positive infinity, has a single mode or peak (occurring at the mean), is symmetrical about the mean and has zero skewness.

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QUESTION: 1138

Assume a student received the following grades for the semester: History, B; Statistics, A; Spanish, C; and English, C. History and English are 5 credit hour courses, Statistics a 4 credit hour course and Spanish a 3 credit hour course. If 4 grade points are assigned for an A, 3 for a B and 2 for a C, what is the weighted mean for the semester grade?

1.96
2.88
4.00
2.76
3.01

Answer(s): D

Explanation:

The student has taken 17 credit hours. The weighted grades for each are: History:5*3 = 15. English: 5*2 = 10.
Statistics: 4*4 = 16. Spanish: 3*2 = 6. Adding we have 15 + 10 + 16 + 6 = 47. Mean = 47/17 = 2.76

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QUESTION: 1139

Suppose that you write an investment newsletter. You track 12 stocks, and you classify these stocks into equal- sized categories of buy, sell, and hold. How many different ways can you classify these stocks into those

categories?

34,860.
36,540.
34,680.
34,650.

Answer(s): D

Explanation:

To answer this question, we need the formula for permutations that takes into account different ways to label things. The number of ways that you can arrange n objects so that there are n_1 of one kind, n_2 of another kind, and so on, up to n_k of a kth kind, is found by using the multinomial formula: n! /[(n_1)! * (n_2)! * ... * (n_k)!]. In this case, your equally-sized categories will be 4 of each kind, 12 in all. 12! / (4!*4!*4!) = 34,650.

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QUESTION: 1140

A random variable with a mean equal to 2.5 and a standard deviation of 2.0 has a coefficient of variation equal to ________.

zero
-2.0
1.25
none of these answers
0.8

Answer(s): E

Explanation:

The coefficient of variation equals the ratio of the standard deviation to the mean.

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QUESTION: 1137

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QUESTION: 1138

Explanation:

QUESTION: 1139

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QUESTION: 1140

Explanation: