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# Statistics Mid Term

 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?

 Part 2 of 9 –

##### Question 2 of 25
1.0 Points
If A and B are mutually exclusive events with P(A) = 0.70, then P(B):

##### Question 3 of 25
1.0 Points
The formal way to revise probabilities based on new information is to use:

 Part 3 of 9 –

##### Question 4 of 25
1.0 Points
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) 0.2 0.25 0.2 0.15 0.1 0.1

Find P( X 3)

##### Question 5 of 25
1.0 Points
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) 0.2 0.25 0.2 0.15 0.1 0.1

Find P( X 5)

##### Question 6 of 25
1.0 Points
A discrete probability distribution:

 Part 4 of 9 –

##### Question 7 of 25
1.0 Points
One reason for standardizing random variables is to measure variables with:

##### Question 8 of 25
1.0 Points
The standard deviation of a probability distribution is a:

##### Question 9 of 25
1.0 Points
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:

##### Question 10 of 25
1.0 Points
Given that Z is a standard normal random variable, P(-1.0 < Z < 1.5) is

##### Question 11 of 25
1.0 Points
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?

##### Question 12 of 25
1.0 Points
The continuous distribution characterized by a symmetric, bell-shaped curve is the:

 Part 5 of 9 –

##### Question 13 of 25
1.0 Points
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.

##### 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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