research methodoloy

Why is it important to match the form of the data that is entered to statistical technique used for analysis?

Four sampling strategies have been proposed to help a bank determine whether customers favour opening on Saturdays versus keeping branches open longer during the week. For each, discuss what kind of sampling strategy is involved and what (if any) biases might result. (a) Sponsor a commercial during a TV program, asking people to dial one of two phone numbers to indicate which option they prefer. (b) Hold a meeting at each branch and tally the opinions expressed by those who attend the meetings. (c) Randomly select one day at each branch and contact every customer who visits the branch that day. (d) Go through the bank’s customer records, selecting every 100th customer. Hire a survey research company to interview the people chosen.

Nike CIO surveyed their employees at the R&D department and collected the following data to help him to decide whether employees should work from home or commute to the work. The data represents the number of miles that employees commute from home to work each day. There are two samples: one for males and one for females. Males: 13 5 2 23 23 14 5 Females: 15 6 3 2 6 Which of the following statements is true? Females have the larger range. The coefficient of variation is larger for males than for females. The coefficient of variation is larger for females than for males. Females have the larger mean.