STAT 151 Questions
Explain the difference between a parameter and a statistic. Choose the correct answer below. 0 A. A parameter is a measure of the population, and a statistic is a measure of a sample. 0 B. A parameter is a categorical measure of a population, and a statistic is a numerical measure of a population. 0 C. A statistic is a measure of the population, and a parameter is a measure of a sample. Explain the difference between a sample and a census. Every ve years, Statistics Canada takes a census. What does this mean? Choose the correct answer below. 0 A. A sample is a group of objects or people we wish to study. A census is a collection of people or objects taken OB. from the population of interest. When Statistics Canada takes a census, it selects a portion of people living in Canada. A sample is a survey in which every member of the population is measured. A census is a survey in which every member of the sample is measured. When Statistics Canada takes a census, it conducts a survey of a sample of people living in Canada. . A sample is a group of objects or people we wish to study. A census is a numerical value that characterizes some aspect of a sample. When Statistics Canada takes a census, it measures some aspect of a sample of people living in Canada. . A sample is a collection of people or objects taken from the population of interest. A census is a survey in which every member of the population is measured. When Statistics Canada takes a census, it conducts a survey of all people living in Canada. The mean GPA of all 3000 students at a college is 2.17. A sample of 200 GPAs from this school has a mean of 2.65. Which number is u and which is x? Choose the correct answer below. O A. The statistic is u = 2.17, and the parameter is x = 2.65. O B. The population mean is x = 2.17, and the sample mean is u = 2.65. O C. The statistic is x = 2.17, and the parameter is u = 2.65. O D. The population mean is u = 2.17, and the sample mean is x = 2.65.ls simple random sampling usually done with or without replacement? Choose the correct answer below. 0 A. Simple random sampling is usually done without replacement. which ensures that unbiased samples are more likely to be chosen than biased samples of the same size. 0 B. Simple random sampling is usually done with replacement, which means that a subject can be selected for a sample more than once. 0 C. Simple random sampling is usually done without replacement. which means that a subject cannot be selected for a sample more than once. 0 D. Simple random sampling is usually done with replacement, which ensures that unbiased samples are more likely to be chosen than biased samples of the same size. Shortly after Country C invaded Country A, a website posed a question to readers of their magazine on the intemet: "Who really poses the greatest danger to world peace? Country A, Country B, or Country C?" The site received 706,474 responses: 6.6% said Country A, 6.1% said Country B, and 87.2% said Country C. Identify the population, and explain why the results might not reect the true opinions of the population. Identify the population. Choose the correct answer below. 0 A. The population consists of all residents of Country A, Country B, and Country C. O B. The population consists of everyone on the internet. 0 C. The population consists of all readers of the magazine on the internet. 0 D. The population consists of the 706,474 people who responded. A phone survey asked whether Old Age Pensions should be continued or abandoned immediately. Only landlines (not cell phones) were called. Do you think this would introduce bias? Explain. Choose the correct answer below. 0 A. This would likely not introduce bias assuming the sample is collected using simple random sampling. 0 B. This would likely introduce measurement bias because older people would be more likely to be surveyed than younger people, and older people are less likely to favour abandoning Old Age Pensions. O c. This would likely introduce sampling bias because older people would be more likely to be surveyed than younger people, and older people are less likely to favour abandoning Old Age Pensions. O D. This would likely not introduce bias assuming the sample size is sufciently large enough to justify statistical inference
