Exam 7: Sampling Distributions

If you divide the number of elements in a population with a specific characteristic by the total number of elements in the population,the dividend is the population:

Use the following to answer questions : Thirty-five percent of all adults read at least one newspaper daily.Suppose you select a sample of 486 adults.The sample proportion is the proportion of adults in this sample who read at least one newspaper daily. -The standard deviation of the sampling distribution of this sample proportion,rounded to four decimal places,is:

The number of hot dogs sold per game at one concession stand at a baseball park is normally distributed with = 23,750 and = 106.You select 13 games at random,and the mean number of hot dogs sold, ,is denoted.What is the standard deviation of ,rounded to three decimal places?

For a continuous random variable x,the population mean and the population standard deviation are 95 and 40,respectively.Assuming ,the standard deviation of the sampling distribution of the sample mean for a sample of 49 elements taken from this population,rounded to two decimals,is:

You ask 2,500 actors in the Screen Actors Guild (SAG)if they have ever appeared in a production of Shakespeare's King Lear.1,225 of them say "yes",while the others say "no".The value p is the proportion of the actors who have appeared in King Lear.You next draw a random sample of 11 actors from the SAG.What are the mean and standard deviation of the sample proportion? Round the mean to two decimal places and the standard deviation to four decimal places.

Use the following to answer questions : A study shows 18.0% of all adult males did not visit their physicians' offices last year.A sample of 623 adult males is selected. -The probability that less than 22.5% of adult males in the sample did not visit their physicians' offices last year,rounded to four decimal places,is approximately:

Use the following to answer questions : Forty percent of all students at a large university live on campus.Suppose you extract a sample of 115 students from this university.The sample proportion is the proportion of students in this sample who live on campus. -The standard deviation of the sampling distribution of this sample proportion,rounded to four decimal places,is:

For a continuous random variable x,the population mean and the population standard deviation are 82 and 18,respectively.You take a simple random sample of 25 elements from this population.The mean of the sampling distribution of the sample mean is:

An error that occurs because of chance is called:

Use the following to answer questions : Thirty-five percent of all adults read at least one newspaper daily.Suppose you select a sample of 486 adults.The sample proportion is the proportion of adults in this sample who read at least one newspaper daily. -The mean of the sampling distribution of this sample proportion is:

The mean of the sampling distribution of the sample mean is the mean of:

The weights of all babies born at a hospital have a mean of 7.4 pounds and a standard deviation of 0.66 pounds.Assuming ,the standard deviation of the sampling distribution of the mean weight of a sample of 32 babies born at this hospital,rounded to three decimal places,is:

The mean of the sampling distribution of the sample mean is:

A company has 15,000 employees and 10,800 of them have completed a particular training course.Management decides to choose a random sample from all employees.What is the minimum number of employees that must be in the sample in order to use the Central Limit Theorem to approximate the distribution of the proportion in the sample who have taken the training course?

If the population from which samples are drawn is not normally distributed,then the sampling distribution of the sample mean is:

A population has a normal distribution with a mean of 79.6 and a standard deviation of 13.3.Assuming ,the probability,rounded to four decimal places,that the sample mean of a sample of size 18 elements selected from this populations will be less than 80.1 is:

Extensive data suggest that the number of overtime hours paid by a large company per month can be modeled as distribution with mean 3.5 and standard deviation 1.4. If P₁ is the probability that the mean of a sample of size 55 lies in the interval (2.9,4.1)and P₂ is the probability that the mean of a sample of size 110 lies in the interval (2.9,4.1),then

The daily sales at a convenience store have a mean of $1280 and a standard deviation of $172.Assuming ,the standard deviation of the sampling distribution of the mean sales of a sample of 16 days for this convenience store,rounded to two decimal places,is:

A continuous random variable x has a normal distribution with a mean of 51 and a standard deviation of 26.The sampling distribution of the sample mean for a sample of 16 elements has what mean and standard deviation?

There are 2,000 bicycles in a community.The owners of 1,250 of these bicycles also own locks for the bikes.A sample of 184 bicycles is chosen,and it just so happens that the proportion of bicycles in the sample that have locks is the same as that for the entire community.How many of the bicycles in the sample have locks?