Week 2 Quiz Question 1 1. A numerical value used as a summary measure for a sample, such as sample mean, is known as a population parameter sample parameter sample statistic population mean Question 2 1. The 50th percentile is the mode median mean third quartile Question 3 1. The difference between the largest and the smallest data values is the variance interquartile range range coefficient of variation Question 4 1. When data are positively skewed, the mean will usually be greater than the median smaller than the median equal to the median positive Question 5 1. The numerical value of the standard deviation can never be larger than the variance zero negative smaller than the variance Question 6 1. Which of the following symbols represents the standard deviation of the population? σ2 σ μ x Question 7 1. Which of the following symbols represents the mean of the population? σ2 σ μ x Question 8 1. Which of the following symbols represents the mean of the sample? σ2 σ μ x Question 9 1. Two events are mutually exclusive if their intersection is 1 if they have no sample points in common if their intersection is 0.5 None of these alternatives is correct. Question 10 1. The range of probability is any value larger than zero any value between minus infinity to plus infinity zero to one any value between -1 to 1 Question 11 1. The sum of the probabilities of two complementary events is 0 0.5 0.75 1 Question 12 1. The union of events A and B is the event containing all the sample points belonging to B or A all the sample points belonging to A or B all the sample points belonging to A or B or both all the sample points belonging to A or B, but not both Question 13 1. Events A and B are mutually exclusive. Which of the following statements is also true? A and B are also independent. P(A ∪ B) = P(A)P(B) P(A ∪ B) = P(A) + P(B) P(A ∩ B) = P(A) + P(B) Question 14 1. The set of all possible sample points (experimental outcomes) is called a sample an event the sample space a population Question 15 1. If A and B are independent events, then P(A) must be equal to P(B) P(A) must be greater than P(B) P(A) must be less than P(B) P(A) must be equal to P(A│B .