1) The shape of a normal distribution curve looks like a bell. a) True b) False 2) In a normal distribution, the mean (average) is located at the very center of the curve. a) True b) False 3) The total area under the entire normal curve is equal to 50%. a) True b) False 4) A z-score of 0 is located exactly at the center of the normal curve. a) True b) False 5) The region to the right of z=0 represents exactly 50% of the total area. a) True b) False 6) A positive z-score is always found on the left side of the center. a) True b) False 7) The region 'below' a z-score means you should look at the area to the left of that value. a) True b) False 8) The region between z=-1 and z=1 smaller than the region between z=-3 and z=3. a) True b) False 9) The area to the left of z=-1 is the same size as the area to the right of z=1. a) True b) False 10) A z-score tells you how many standard deviations a value is away from the mean. a) True b) False 11) A z-score of 3.0 means the value is very close to the mean. a) True b) False 12) A sample is considered 'biased' if it does not fairly represent the whole population. a) True b) False 13) Using a bigger sample size usually makes the results less accurate. a) True b) False 14) Random sampling is the best way to avoid bias when picking a group. a) True b) False 15) A sample is always exactly the same as the population. a) True b) False

Normal Distribution and Sampling 1

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