Review Final Exam for WPC 300 2024/2025 questions with A-graded answers

Review Final Exam for WPC 300 2024/2025 questions with A-graded answers Which of the following describes the standard deviation? - CORRECT ANSWER-It is the square root of the variance. When two variables are highly positively correlated, the correlation coefficient will be _______. - CORRECT ANSWER-close to 1 According to statistical notation, what does ∑ stand for? - CORRECT ANSWER-to act as a summation operator The ________ is the observation that occurs most frequently. - CORRECT ANSWERmode The difference between the first and third quartiles is referred to as the ____________. - CORRECT ANSWER-interquartile range Which of the following is an example of a measure of dispersion? - CORRECT ANSWER-variance Which of the following describes a positively skewed histogram? - CORRECT ANSWER-a histogram that tails off toward the right Which of the following is true for a median? - CORRECT ANSWER-For an even number of observations, the median is the mean of the two middle numbers Which of the following is an example of a sample? - CORRECT ANSWER-The number of IT employees out of all employees working in an office of Google For a normal distribution mean is _______ to median. - CORRECT ANSWER-equal When sample size increases Correct - CORRECT ANSWER-Confidence interval decreases Which of the following proposition describes an existing theory or belief? - CORRECT ANSWER-Null hypothesis Which of the following is a Type-I error? - CORRECT ANSWER-The null hypothesis is actually true, but the hypothesis test incorrectly rejects it