Statistics

91. The classical definition of probability is based on the assumption that outcomes are:

• A Equally likely Correct answer
• B Mutually exclusive only
• C Dependent
• D Infinite

92. In a Poisson distribution with parameter lambda = 7, the mean and variance are respectively:

• A 7 and 7 Correct answer
• B 7 and 2.65
• C 49 and 7
• D 7 and 49

93. The sum of deviations of a set of 46 observations from their arithmetic mean is always:

• A Zero Correct answer
• B Positive
• C Negative
• D Sum of observations

94. If event A and event B are independent with P(A) = 0.2 and P(B) = 0.3, what is P(A and B)?

• A 0.06 Correct answer
• B 0.5
• C 0.10
• D 0.00

95. In a Poisson distribution with parameter lambda = 5, the mean and variance are respectively:

• A 5 and 5 Correct answer
• B 5 and 2.24
• C 25 and 5
• D 5 and 25

96. If the variance of a dataset is 164, what is its standard deviation?

• A 12.81 Correct answer
• B 25.61
• C 6.40
• D 15.81

97. If events A and B are mutually exclusive with P(A) = 0.4 and P(B) = 0.3, what is P(A or B)?

• A 0.120
• B 0.7 Correct answer
• C 1.00
• D 0.10

98. The standard deviation of a sampling distribution is known as:

• A Standard Error Correct answer
• B Sample Variance
• C Parameter Deviation
• D Bias Error

99. If every value in a dataset is increased by 52, what happens to the standard deviation?

• A Increases by 52
• B Decreases by 52
• C Remains unchanged Correct answer
• D Multiplied by 52

100. If events A and B are mutually exclusive with P(A) = 0.2 and P(B) = 0.1, what is P(A or B)?

• A 0.020
• B 0.3 Correct answer
• C 1.00
• D 0.10