Callaway Golf Callaway Golf Co.has Long Been a Leader in Women's Golf

Callaway Golf
Callaway Golf Co.has long been a leader in women's golf equipment,but it wanted to expand its lead in this growing sector of the market.While Callaway's technical people knew what could be done with design,they did not know exactly what women wanted in their clubs.Callaway management decided what it needed to do was to bring the technicians and women golfer together.Beginning about three years ago Callaway sent a team of researchers,designers,and golf pros out to visit with 40 women golfers of various abilities in locations from California to Florida.In selecting the golfers to study Callaway decided to focus on women that were just beginning to play and experienced,competitive golfers that wanted to own the latest equipment.Callaway management felt that these two extreme groups of golfers had been overlooked by golf club manufacturers.Further,Callaway felt that if they could learn enough about these two groups they would also learn enough to serve the rest of the women golfer market.Basically the research team observed the women playing golf and listened to their comments and concerns.The information gathered by this research team was built into every aspect of the design of a new golf club,including the feel of the club,the length of the club shaft and size of the club head,and the weight of the club.When prototypes of the new clubs were completed they were sent to the women golfers to get their feedback.That feedback was then used to refine the club design.This process went on until the women said the new clubs worked.The entire process from original prototype to final product took a little less than one year.
-Refer to Callaway Golf.An experimental approach to evaluating the quality of the new Callaway golf clubs would be to have the women golfers to play two rounds of golf,one with their own clubs and one with the new Callaway clubs.The golfers results for the two rounds could then be compared to help determine which clubs were the best.What is normally the most difficult aspect of conducting experimental research?

A) the cost of the experiment
B) controlling sampling error
C) holding variables constant
D) controlling measurement error
E) the questionnaire nature of the data