A: We can observe the entire population.
B: A sample drawn from the population of interest. is not adequate to discribe population.
C: In the Monte Carlo demonstration from last time, an individual dataset was the sample and the Data Generating Process described the population.
D: none of the above is right
举一反三
- A researcher decide to draw the entire sample from one "representative" city, and the population includes all cities. the researcher must be confident that the chosen sample is truly representative of the entire population. This is belonging to ().
- A sample of 400 observations will be taken from an infinite population. The population proportion equals 0.8. The probability that the sample proportion will be greater than 0.83 is
- A foreign population is referred to as an autochthonous population.
- Which of the following is NOT a reason for the need for sampling? A: It is usually too costly to study the whole population. B: It is usually too time consuming to look at the whole population. C: It is sometimes destructive to observe the entire population. D: It is always more informative by investigating a sample than the entire population.
- in comparing the means of two independent population , sample are randomly selected from normally distributed populations and population variances are equal, we can use paired t test for the mean difference.
内容
- 0
Population policies have significant legal, social, ethical, and cultural impact. Optimal population size appears adequate for economy, education, healthcare, and environment. Family planning is important for adjusting the size of population.
- 1
From a population of 500 elements, a sample of 225 elements is selected. It is known that the variance of the population is 900. The standard error of the mean is approximately
- 2
A summary measure that is computed from a sample to describe a characteristic of the population is called:
- 3
A summary measure that is computed to describe a characteristic from only a sample of the population is called
- 4
After the epidemic infection of infectious diseases, specific immunity is obtained, which increases the immune population and reduces the susceptibility of the population.