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 ().
举一反三
- A researcher wants to estimate the difference in the means of two populations. A random sample of 36 items from the first population results in a sample mean of 430. A random sample of 49 items from t
- which statement is right? 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
- A sample in which the characteristics of the sample are the same as those of the population is a(n): （ ） A: attributes sample. B: variables sample. C: random sample. D: representative sample.
- 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 researcher wants to estimate the proportion of the population which possess a given characteristic. A random sample of size 600 is taken resulting in 330 items which possess the characteristic. The point estimate for this population proportion is _______.