Sta 261 Exam 1 Real Exam Questions And Answers

Shape of Distribution: {Ans: (number of peaks) -unimodal -bimodal -multimodal Skewness & symmetry (right, left, symmetric)}Assume each newborn baby had a probability of approximately 0.54 of being female and 0.46 of being male. For a family of four children, let X = number of children who are girls. Which of the below are the four conditions for a binomial distribution? {Ans: 1. The trials n are independent 2. Each trial has the same probability of a success 3. Each trial has 2 outcomes 4. There are fixed number of trials}The carbon dioxide emissions of a group of nations had a mean of 8.2 and a standard deviation of 3.4. Find the z-score for the observation of 14.5 {Ans: 1.85}Suppose a cereal manufacturer puts pictures of famous athletes on cards in boxes of cereal. The manufacturer announces that 30% of the boxes contain a picture of LeBron James, 20% of Cristiano Ronaldo, 10% of Danica Patrick, 20% of Serena Williams, and the rest a picture of Floyd Mayweather. You want all 5 pictures. How many boxes of cereal must you buy? What is the component to be repeated? {Ans: buying a box of cereal}SOCS {Ans: Shape