Exam 7: Sampling and Sampling Distributions

A new soft drink is being market tested.It is estimated that 60% of consumers will like the new drink.A sample of 96 taste tested the new drink. a.Determine the standard error of the proportion b.What is the probability that more than 70.4% of consumers will indicate they like the drink? c.What is the probability that more than 30% of consumers will indicate they do not like the drink?

The sample statistic,such as ,s,or ,that provides the point estimate of the population parameter is known as

Exhibit 7-3 In a local university,40% of the students live in the dormitories.A random sample of 80 students is selected for a particular study. -Refer to Exhibit 7-3.The standard deviation of ,known as the standard error of the proportion is approximately

As a rule of thumb,the sampling distribution of the sample proportions can be approximated by a normal probability distribution whenever

Random samples of size 49 are taken from a population that has 200 elements,a mean of 180,and a variance of 196.The distribution of the population is unknown.The mean and the standard error of the mean are

How many simple random samples of size 3 can be selected from a population of size 7?

Four hundred people were asked whether gun laws should be more stringent.Three hundred said "yes," and 100 said "no." The point estimate of the proportion in the population who will respond "no" is

As the sample size increases,the

For a population with any distribution,the form of the sampling distribution of the sample mean is

Exhibit 7-2 A random sample of 10 examination papers in a course,which was given on a pass or fail basis,showed the following scores. -Refer to Exhibit 7-2.The point estimate for the mean of the population is

The following data was collected from a simple random sample of a population. The mean of the population

A random sample of 150 people was taken from a very large population.Ninety of the people in the sample were female.The standard error of the proportion is

Which of the following sampling methods does not lead to probability samples?

In a restaurant,the proportion of people who order coffee with their dinner is .9.A simple random sample of 144 patrons of the restaurant is taken. a.What are the expected value,standard deviation,and shape of the sampling distribution of? b.What is the probability that the proportion of people who will order coffee with their meal is between 0.85 and 0.875? c.What is the probability that the proportion of people who will order coffee with their meal is at least 0.945?

The following information was collected from a simple random sample of a population. The point estimate of the mean of the population is

The following data was collected from a simple random sample of a population. If the population consisted of 10 elements,how many different random samples of size 6 could be drawn from the population?

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 random sample of 15 telephone calls in an office showed the duration of each call and whether it was a local or a long distance call. a.What is the point estimate for the average duration of all calls? b.What is the point estimate for the standard deviation of the population? c.What is the point estimate for the proportion of all calls that were long distance?

A population has a mean of 180 and a standard deviation of 24.A sample of 64 observations will be taken.The probability that the sample mean will be between 183 and 186 is

Exhibit 7-1 A random sample of 121 bottles of cologne showed an average content of 4 ounces.It is known that the standard deviation of the contents (i.e. ,of the population)is 0.22 ounces. -Refer to Exhibit 7-1.The point estimate of the mean content of the bottles is