CHAPTER 7: SAMPLING AND SAMPLING DISTRIBUTIONS

1. True or False: The question: “How much did you make last year rounded to the nearest hundreds of dollars?” will most likely result in measurement error.

TABLE 7-6

According to an article, 19% of the entire U.S. population have high-speed access to the Internet. Random samples of size 200 are selected from the U.S. population.

1. Referring to Table 7-6, the population mean of all the sample proportions is ______.

1. Referring to Table 7-6, the standard error of all the sample proportions is ______.

1. Referring to Table 7-6, among all the random samples of size 200, ______ % will have between 14% and 24% who have high-speed access to the Internet.

1. Referring to Table 7-6, among all the random samples of size 200, ______ % will have between 9% and 29% who have high-speed access to the Internet.

1. Referring to Table 7-6, among all the random samples of size 200, ______ % will have more than 30% who have high-speed access to the Internet.

1. Referring to Table 7-6, among all the random samples of size 200, ______ % will have less than 20% who have high-speed access to the Internet.

1. Referring to Table 7-6, among all the random samples of size 200, 90 % will have less than _____% who have high-speed access to the Internet.

1. Referring to Table 7-6, among all the random samples of size 200, 90 % will have more than _____% who have high-speed access to the Internet.

TABLE 7-7

Online customer service is a key element to successful online retailing. According to a marketing survey, 37.5% of online customers take advantage of the online customer service. Random samples of 200 customers are selected.

1. Referring to Table 7-7, the population mean of all possible sample proportions is ______.
2. 1. Referring to Table 7-7, the standard error of all possible sample proportions is ______.
   1. Referring to Table 7-7, ____ % of the samples are likely to have between 35% and 40% who take advantage of online customer service.
   1. Referring to Table 7-7, ____ % of the samples are likely to have less than 37.5% who take advantage of online customer service.
   1. Referring to Table 7-7, 90% of the samples proportions symmetrically around the population proportion will have between _____% and _____% of the customers who take advantage of online customer service.
   1. Referring to Table 7-7, 95% of the samples proportions symmetrically around the population proportion will have between _____% and _____% of the customers who take advantage of online customer service.