Exam 7: Sampling and Sampling Distributions

Which of the following yields a simple random sample?

The amount of bleach a machine pours into bottles has a mean of 36 oz. with a standard deviation of 0.15 oz. Suppose we take a random sample of 36 bottles filled by this machine. So, the middle 95% of the sample means based on samples of size 36 will be between ________ and ________ ounces.

Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in a recent year. Suppose a sample of 100 major league players was taken. Find the approximate probability that the mean salary of the 100 players was no more than $3.0 million.

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. -Referring to Table 7-7, ________% of the samples are likely to have less than 37.5% who take advantage of online customer service.

The amount of tea leaves in a can from a particular production line is normally distributed with μ = 110 grams and σ = 25 grams. A sample of 25 cans is to be selected. So, the middle 70% of all sample means will fall between what two values?

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. -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.

The amount of tea leaves in a can from a particular production line is normally distributed with μ = 110 grams and σ = 25 grams. A sample of 25 cans is to be selected. What is the probability that the sample mean will be between 100 and 120 grams?

The question "How many times have you abused your spouse in the last six months?" will most likely result in nonresponse error.

For sample size 1, the sampling distribution of the mean will be normally distributed

The amount of time required for an oil and filter change on an automobile is normally distributed with a mean of 45 minutes and a standard deviation of 10 minutes. A random sample of 16 cars is selected. 95% of all sample means will fall between what two values?

There can be only one sample selected from a population.

If a simple random sample is chosen with replacement, each individual has the same chance of selection on every selection.

Which of the following sampling methods will more likely be susceptible to ethical violation when used to form conclusions about the entire population?

A convenience sample is a type of probability sample.

A company selling apparel online sends out emails every Monday to all its customers who made a purchase. This is an example of a

Which of the following sampling methods will more likely be susceptible to ethical violation when used to form conclusions about the entire population?

Sampling error can be reduced by taking larger sample sizes.

Which of the following scenarios will yield a nonprobability sample?

TABLE 7-6 According to an article, 19% of the entire population in a developing country have high-speed access to the Internet. Random samples of size 200 are selected from the country's population. -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.

The amount of bleach a machine pours into bottles has a mean of 36 oz. with a standard deviation of 0.15 oz. Suppose we take a random sample of 36 bottles filled by this machine. The probability that the mean of the sample is less than 36.03 is ________.