举一反三
- Which of the followings are demographic characteristics？（ ） A: Ethnicity B: Gender C: Age D: Marital status
- The average population of the family decrease_from 1961 to 2000
- Which population category equals the sum of employed and unemployed people? A: working-age population B: labor force C: young and institutionalized D: not in the labor force
- Like many other nations, China faces the demographic issue of a/an ______ aging population that is living longer.
- The high-yielding crop population structure requires the larger storage capacity.
内容
- 0
Which of following is not market segmentation? ( ) A: Segmenting<br/>business market B: Segmenting<br/>local market C: Segmenting<br/>consumer market D: Segmenting<br/>international market
- 1
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 _______.
- 2
The author of the passage intends to _________. A: warn people against the population explosion in the near future B: compare the demographic growth pattern in the past with that after 1650 C: find out the cause for rapid increase in population in recent years D: present us a clear and complete picture of the demographic growth
- 3
A researcher is interested in testing to determine if the mean of population one is greater than the mean of population two. The null hypothesis is that there is no difference in the population means (i.e. the difference is zero). The alternative hypothesis is that there is a difference (i.e. the difference is not equal to zero). He randomly selects a sample of 9 items from population one resulting in a mean of 14.3 and a standard deviation of 3.4. He randomly selects a sample of 14 items from population two resulting in a mean of 11.8 and a standard deviation 2.9. He is using an alpha value of .10 to conduct this test. Assuming that the populations are normally distributed, the critical t-value from the table is _______.
- 4
Family Planning Policy is helpful to change the population reproduction type of China.