Exam 7: Sampling and Sampling Distributions

The sampling distribution of the sample means is close to the normal distribution only if the distribution of the population is close to normal.

Suppose 40% of the population of pre-teens have a TV in their bedroom.If a random sample of 500 pre-teens is drawn from the population,then the probability that between 36% and 44% of the pre-teens have a TV in their bedroom is _______.

Albert Abbasi,VP of Operations at Ingleside International Bank,is evaluating the service level provided to walk-in customers. Accordingly,he plans a sample of waiting times for walk-in customers. Albert randomly selects 4 as a starting point and instructs his staff to record the waiting times for the 4th walk-in customer and every 10th customer thereafter (4,14,24,etc.). Albert's sample is a ________.

If every unit of the population has the same probability of being selected to the sample,then the researcher is probably conducting random sampling.

Paige DeMarco is the Vice President for University Advancement at State University. She is responsible for the capital campaign to raise money for the new student services building.Paige plans to target alumni and acquires her sampling frame from the State University Office of Alumni Relations.She intends to contact these individuals regarding possible donations.Paige chooses her sample by selecting six-digit numbers (1 to 150,000)from a random number table. Her sample is a _________.

In some situations,sampling may be the only option because the population is inaccessible.

With cluster sampling,there is homogeneity within a subgroup or stratum.

According to the central limit theorem,if a sample of size 56 is drawn from a population with a mean of 16,the mean of all sample means would equal _______.

Suppose 90% of students in some specific college have a computer at home and a sample of 40 students is taken. The probability that more than 30 of those in the sample have a computer at home can be approximated using the normal approximation.

Paige DeMarco is the Vice President for University Advancement at State University. She is responsible for the capital campaign to raise money for the new student services building.Paige plans to target alumni and acquires her sampling frame from the State University Office of Alumni Relations.She intends to contact these individuals regarding possible donations. She randomly selects the sixth name as a starting point and then selects every 100th subsequent name (106,206,306,etc.). Her sample is a _________.

Albert Abbasi,VP of Operations at Ingleside International Bank,is evaluating the service level provided to walk-in customers. Accordingly,he plans a sample of waiting times for walk-in customers. Albert instructs his staff to record the waiting times for the first 45 walk-in customers arriving after the noon hour. Albert's sample is a ________.

Suppose 40% of the population of pre-teens have a TV in their bedroom.If a random sample of 500 pre-teens is drawn from the population,then the probability that 44% or more of the pre-teens have a TV in their bedroom is _______.

Suppose 40% of all college students have a computer at home and a sample of 100 is taken.What is the probability that more than 50 of those in the sample have a computer at home?