OIS 2340
Chapter 3 Graded Homework
Question 1 Portfolio A of a collection of stocks is considered more risky than portfolio B if:
portfolio A has a higher mean than portfolio B.portfolio A has a higher variance than portfolio B.portfolio A has a higher coefficient of variation than portfolio B.portfolio A has a higher standard deviation.
Question 2 If a data set has 740 values that have been sorted from low to high, which value in the data set will be the 20thpercentile?
Question 3 In order to compute the mean and standard deviation, the level of data measurement should be:
Question 4 Dynamic random-access memory (DRAM) memory chips are made from silicon wafers in manufacturing facilities through a very complex process called wafer fabs. The wafers are routed through the fab machines in an order that is referred to as a recipe. The wafers may go through the same machine several times as the chip is created. The data file DRAM Chipscontains a sample of processing times, measured in fractions of hours, at a particular machine center for one chip recipe.

Calculate the 80th percentile for processing time.
Question 5 Data was collected on the number of television sets in a household, and it was found that the mean was 3.5 and the standard deviation was 0.75.Based on these sample data, what is the standardized value corresponding to 5 televisions?
1.1252.002.001.5
Question 6 Which of the following statements is true?