An experiment to measure the effect of giving growth hormones to girls affected by Turner's Syndrome was carried out recently in Vancouver. All 34 girls in the study were given the growth hormone and their heights were measured at the time of the hormone was given and again one year later. No measurements were made on their final adult heights. Which of the following is not a problem with this experiment?
(a) There was no blinding.
(b) There was no control group.
(c) Nonresponse bias.
(d) There was insufficient attention to the placebo effect.
(e) Because final heights were not measured, it is impossible to tell if the hormone affected final height or only accelerated growth and made no difference to final height.