Exam 6: Sampling and Sampling Distributions

Suppose that a second (independent)random sample of 10 students was taken.Without doing the calculations,state whether the probabilities in the second,third and fourth questions would be higher,lower,or the same for the second sample.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: It has been found that 62.1% of all unsolicited third class mail delivered to households goes unread.Over the course of a month,a household receives 100 pieces of unsolicited mail. -What is the variance of the proportion?

The standard deviation of is also called the:

A sample of size 25 is selected at random from a finite population.If the finite population correction factor is 0.80,then the population size is:

The standard deviation of the sampling distribution of the sample mean is also called the:

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The chairman of the statistics department in a certain college believes that 70% of the department's graduate assistantships are given to international students.A random sample of 50 graduate assistants is taken. -Assume that the chairman is correct and P = 0.70.What is the sampling distribution of the sample proportion ?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: You have recently joined a country club.Suppose that the number of times you expect to play golf in a month is represented by a normally distributed random variable with a mean of 10 and a standard deviation of 2.4. -The number of orders that come into a mail-order sales office each month is normally distributed with a mean of 298 and a standard deviation of 15.4.For a particular sample size,the probability that the sample mean exceeds 300 is 0.2.How big must the sample be?