A national chain of department stores ranks its 1,000,000 salespeople by the monetary value of their sales. Ivanna's sales are at the 62 percentile. Greg's th sales are at the 76" percentile. (If necessary, consult a list of formulas.) (a) Which of the following must be true about Ivanna's sales? O Ivanna had sales lower in value than about 62% of the salespeople. The value of Ivanna's sales were about 62% of the chain's total. Ivanna had sales higher in value than about 62% of the salespeople. O The value of Ivanna's sales were about 38% of the chain's total. (b) Which of the following must be true about Ivanna's and Greg's sales? O Ivanna's sales were higher in value than Greg's sales. Both Ivanna and Greg had sales higher in value than the median. The value of Greg's sales were $1400 more than Ivanna's. The values of both Ivanna's and Greg's sales were in the bottom half of all of the salespeople.

Joselyn hopes to receive a grade of B or better in her statistics class. Currently she has scored 75, 83, and 81 on her three in-class tests and also has a homework average of 88. Her professor calculates the class grade by finding the mean of five grades: three in-class tests, the homework average and the final exam. What is the minimum score Joselyn must earn on the final exam to have a class grade (mean) of 80? A. 67 B. 95 C. 70 D. 73

In 2016 the Better Business Bureau settled 84% of complaints they received in the United States. Suppose you have been hired by the Better Business Bureau to investigate the complaints they received this year involving new car dealers. You plan to select a sample of new car dealer complaints to estimate the proportion of complaints the Better Business Bureau is able to settle. Assume the population proportion of complaints settled for new car dealers is 0.84, the same as the overall proportion of complaints settled in 2016. Use the z-table. a. Suppose you select a sample of 200 complaints involving new car dealers. Show the sampling distribution of p. E(p) (to 2 decimals) (to 4 decimals) b. Based upon a sample of 200 complaints, what is the probability that the sample proportion will be within 0.04 of the population proportion (to 4 decimals)? probability : = c. Suppose you select a sample of 460 complaints involving new car dealers. Show the sampling distribution of p. E(F) (to 2…

I can't understand why the data is the percentage of surveyed parents.