Jacy wants to determine how age and height are related to shoe preference in her town. She selects a simplerandom sample of 25 individuals taller than five feet seven inches from the 18-to 21-year age group and recordstheir age, height, and shoe preference (tennis shoes, high-heeled shoes, sandals). She also selects an independentsimple random sample of 30 individuals shorter than five feet seven inches from the 35-to 45-year age group andrecords the same information. Which is the most important observation about Jacy's plan?Her samples are too small.She should have used equal sample sizes.The plan is well conceived and should serve the intended purpose.She will be unable to tell whether a difference in shoe preference is related to a difference in age or to adifference in height.She should have selected the two age groups randomly instead of choosing them specifically.