A is the answer to this question.
Answer:
In the Shang dynasty they used bronze for weapons like spears. They also used it to make farm tools, bells,bowls, cups,drums and as decoration on chariots to name a few
Answer:
The response to the question is a discrete random variable.
Explanation:
By definition of a discrete random variable we infer that the response can only take certain known values but the response shall be completely random. As an example when we toss a fair coin the out comes are discrete as only either head or tail is possible and the outcome is random meaning we cannot predict the outcome before hand.
Similarly an continuous random variable takes any value in a set and there are infinitely many possible values it can take. For example if we choose any real number between 1 and 10. Since the answers are infinitely many in number and are completely random.
Now in our survey we can infer that the responses shall be either "yes I smoked last week" or "No i didn't smoke last week". Hence the variables are discrete and random.
Answer:
Accidental errors.
Explanation:
As the exercise explains, a random/accidental error remains in after mistakes and have been eliminated. They are caused by factors beyond the control of the observer. They are present in all surveying observations. This type of error usually result from human mistakes or accidental errors. The latter type are errors caused by changing experimental conditions, out of the control of the individual doing the study or experiment. It's hard to quantify how "disastrous" they can be given that most of the times it depends on the context of the study.
