STAT 200 QUIZ 1 VERIFIED A+ LATEST STAT 200

STAT 200 Quiz 1 1. The newspaper reports that higher rates of sunburn and ice cream consumption correspond. Does that mean that eating ice cream can put you at risk of sunburn? What might be the reason behind this phenomenon? a. Kids are not waiting 40 minutes after eating to swim *b. In summer both ice cream consumption and rates of sunburn increase c. Eating ice cream is viewed as a replacement for sunblock 2. A prospective graduate student may be interested in class size at the university s/he will attend. Data on how many students were in last years incoming class is an example of: *a. Descriptive statistics b. Inferential statistics 3. A random sample is one ______ a. That is haphazard b. That is unplanned *c. In which every unit of a particular size has an equal probability of being selected d. That ensures that there will be no uncertainty in the conclusions 4. True or False? A sample of only those students seated in the front row of class would be an unbiased sample. a. True *b. False 5. Stratified sampling___ a. Can be more representative than simple randomized sampling b. Can be used if the population has a number of distinct groups c. Is done by randomly sampling from subgroups in a way that is proportional to their size in the population *d. All of the above 6. The following distribution has: a. A positive skew *b. A left skew c. No skew 7. A normal or bell shaped distribution has its greatest probability density in the middle. *a. True b. False 8. Which of the following is a qualitative variable? a. Weight in pounds b. Number of days of precipitation *c