QMB 3200 Final Exam CH 7 and 8 Questions And Answers 100% Verified

QMB 3200 Final Exam CH 7 and 8 Questions And Answers 100% Verified Doubling the size of the sample will: - answerreduce the standard error of the mean How many simple random samples of size 5 can be selected from a population of size 8? - answer56 (8*7*6)/(1*2*3) Cluster sampling is: - answerA probability sampling method The distribution of values taken by a statistic in all possible samples of the same size from the same population is the sampling distribution of: - answerthe sample 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: - answer.0400 sqrt(.6)(.4)/150) Parameters are: - answernumerical characteristics of a population. A sample of 66 observations will be taken from an infinite population. The population proportion equals .12. The probability that the sample proportion will be less than .1768 is: - answer.92 sqrt(.12)(.88)/66) = 0.04 Z= Sample proportion-population proportion/ .04 = 1.42 find 1.42 in z table The value of the _____ is used to estimate the value of the population parameter. - answersample statistic A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12, respectively. The standard error of the mean is: - answer1.20 σx̅= sigma/sqrt(n) 12/sqrt(100) In a survey of public opinion concerning state aid to a particular city, every 40th person registered as a voter was interviewed, beginning with a person selected at random from among the first 40 listed. This is an example of: - answersystematic sampling In computing the standard error of the mean, the finite population correction factor is used when: - answern/N > 0.5 The central limit theorem states that: - answerif the sample size n is large, then the sampling distribution of the sample mean can be approximated by a normal distribution. In a recent Gallup Poll, the decision was made to increase the size of its random sample of voters from 1500 people to about 4000 people. The purpose of this increase is to: - answerreduce the standard error of the estimate. 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 .22 ounces. In this problem, the value .22 ounces is: - answera parameter Which of the following is not a symbol for a parameter? - answers, standard deviation of a SAMPLE Random samples of size 100 are taken from an infinite population whose population proportion is .2. The mean and standard deviation of the sample proportion are: - answer.2 and .04 sqrt((.2)(.8)/100) The central limit theorem is important in Statistics because it: - answerenables reasonably accurate probabilities to be determined for events involving the sample average when the sample size is large regardless of the distribution of the variable. Which of the following statements regarding the sampling distribution of sample means is incorrect? - answerThe standard deviation of the sampling distribution is the standard deviation of the population. For a(n) _____ , it is impossible to construct a sampling frame. - answerinfinite population In stratified random sampling: - answerrandomly selected elements within each of the strata form the sample.