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Statistics Mid Term

Statistics Mid Term

Daniel Kevins

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Part 1 of 9 –

Question 1 of 25

1.0 Points

Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12?

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Part 2 of 9 –

Question 2 of 25

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If A and B are mutually exclusive events with P(A) = 0.70, then P(B):

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Question 3 of 25

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The formal way to revise probabilities based on new information is to use:

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Part 3 of 9 –

Question 4 of 25

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The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.

x	0	1	2	3	4	5
P (X=x)	0.20	0.25	0.20	0.15	0.10	0.10

Find P( X $f$leq f$$ 3)

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Question 5 of 25

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The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.

x	0	1	2	3	4	5
P (X=x)	0.20	0.25	0.20	0.15	0.10	0.10

Find P( X $f$leq f$$ 5)

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Question 6 of 25

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A discrete probability distribution:

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Part 4 of 9 –

Question 7 of 25

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One reason for standardizing random variables is to measure variables with:

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Question 8 of 25

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The standard deviation of a probability distribution is a:

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Question 9 of 25

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The theorem that states that the sampling distribution of the sample mean is approximately normal when the sample size n is reasonably large is known as the:

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Question 10 of 25

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Given that Z is a standard normal random variable, P(-1.0 < Z < 1.5) is

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Question 11 of 25

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If Z is a standard normal random variable, the area between z = 0.0 and z =1.30 is 0.4032, while the area between z = 0.0 and z = 1.50 is 0.4332. What is the area between z = -1.30 and z = 1.50?

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Question 12 of 25

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The continuous distribution characterized by a symmetric, bell-shaped curve is the:

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Part 5 of 9 –

Question 13 of 25

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Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), “E” or “e” (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where “a” and “b” need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

The following data are the base salaries, in thousands of dollars, of 50 chief executive officers for a sample of companies doing business with the state of Connecticut. That is, the first entry in the table below corresponds to a salary of $125,000. A copy of this data set can be found in the Excel Workbook called CEOSalaries.xls.

125	157	113	127	201
165	145	119	148	158
148	168	117	105	136
136	125	148	108	178
179	191	225	204	104
205	197	119	209	157
209	205	221	178	247
235	217	222	224	187
265	148	165	228	239
245	152	148	115	150

Find the interquartile range of the CEO salaries, in thousands of dollars, rounded to 2 decimal places. Do not use a dollar sign. Note: $177,760 should be recorded as 177.76.

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Question 25 of 25

1.0 Points

Using the standard normal curve, the Z- score representing the 85th percentile is 0.67

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Daniel Kevins

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