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# Statistics Mid Term

Part 1 of 9 -Question 1 of 251.0 PointsWhich of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12?Reset SelectionPart 2 of 9 -Question 2 of 251.0 PointsIf A and B are mutually exclusive events with P(A) = 0.70, then P(B):Reset SelectionQuestion 3 of 251.0 PointsThe formal way to revise probabilities based on new information is to use:Reset SelectionPart 3 of 9 -Question 4 of 251.0 PointsThe 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.x012345P (X=x)0.200.250.200.150.100.10Find P( X 3)Reset SelectionQuestion 5 of 251.0 PointsThe 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.x012345P (X=x)0.200.250.200.150.100.10Find P( X 5)Reset SelectionQuestion 6 of 251.0 PointsA discrete probability distribution:Reset SelectionPart 4 of 9 -Question 7 of 251.0 PointsOne reason for standardizing random variables is to measure variables with:Reset SelectionQuestion 8 of 251.0 PointsThe standard deviation of a probability distribution is a:Reset SelectionQuestion 9 of 251.0 PointsThe 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:Reset SelectionQuestion 10 of 251.0 PointsGiven that Z is a standard normal random variable, P(-1.0 < Z < 1.5) isReset SelectionQuestion 11 of 251.0 PointsIf 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?Reset SelectionQuestion 12 of 251.0 PointsThe continuous distribution characterized by a symmetric, bell-shaped curve is the:Reset SelectionPart 5 of 9 -Question 13 of 251.0 PointsAccepted 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.125157113127201165145119148158148168117105136136125148108178179191225204104205197119209157209205221178247235217222224187265148165228239245152148115150Find 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.Reset SelectionQuestion 25 of 251.0 PointsUsing the standard normal curve, the Z- score representing the 85th percentile is 0.67Reset Selection