7. A researcher running an experiment collects the following 5 samples. Sample 1: mean 45 ; sample 2: mean 49; sample 3: mean 32; sample 4: mean 79; sample 5: mean 85, sample 6: mean 99. The true population mean is 76. a. Describe these samples in terms of variability (high or low) and bias (high or low). b. Do you think a large or small sample was used? c. Do you think a random or non-random sampling method was used