Flavia was curious if a sample first quartile lor Q1) was an unbiased estimator of a population first quartile She started with a large normally distributed population of test scores whose first quartile was Q1 = 70 points. She then took a random sample of 6 tests and calculated the first quartile of the sample. She replaced those tests and repeated this process for a total of 50 trials. Her results are summarized in the dotplot below, where each dot represents the first quartile from a sample of 6 tests. 60 61 68 72 Sample first quartile 76 80 Based on these results, does sample first quartile appear to be a blased or unbiased estimator of 6 of 9