A statistics professor asked students in their ages. On the basis of this inform

Question

A statistics professor asked students in their ages. On the basis of this information, the professor states that the average age of all the students in the university is 21 years. This is an example of a. census b. descriptive statistics c. an experiment d. statistical inference The owner of a factory regularly requests a graphical summary of all employees' salaries. The graphical summary of salaries is an example of a. a sample b. describe statistics c. statistical inference d. an experiment The Department of Transportation of a city has noted that on the average there are 14 accidents per day. The average number of accidents is an example of a. descriptive statistics b. statistical inference c. a sample d. a population The process of analyzing sample data in order to draw conclusions about the characteristics of a population is called a. descriptive statistics b. statistical inference c. data analysis d. data summarization In a post office, the mailboxes are numbered from 1 to 5.000. These numbers represent a. categorical data b. time series data c either categorical or quantitative data d. quantitative data The average age in a sample of 90 students at City College is 20. As a result of this sample, it can be concluded that the average age of all the students at City College a. must be more than 20, since the population is always larger than the sample b. must be less than 20, since the sample is only a part of the population c. could not be 20 d. could be larger, smaller, or equal to 20 Since a sample is a subset of the population, the sample mean a. is always smaller than the mean of the population b, is always larger than the mean of the population c must be equal to the mean of the population d. can be larger, smaller, or equal to the mean of the population Since a sample is a subset of the population, a percentage that is calculated from the sample data a. is always smaller than the corresponding percentage from the population b. is always larger than the corresponding percentage from the population c. must be equal to the corresponding percentage from the population d can be larger, smaller, or equal to the corresponding percentage from the population

Explanation / Answer

By usual definition in Statistics we found the following correct answer:

Q-17-b

Q-18-b

Q-19-a

Q-20-b

Q-21-a

Q-22-d

Q-23-d

Q-24-d

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