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# QNT 561 Week 1 Practice Quiz

AU

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Date Created: 11/14/15

A B C D ch A A B C D E F A B C D A B What is statistics It is the science that deals with collection classi cation analysis and interpretation of information or data It is the process used to assign numbers to variables of individual population units It is an estimate or prediction or some other generalization about a population based on information contained in a sample It is a characteristic or property of an individual experimental unit oose the correct answer below Descriptive statistics is a characteristic of an individual experimental unit Inferential statistics is the process used to assign numbers to variable of individual population units Descriptive statistics describes sets of data Inferential statistics draws conclusion about the sets of data based on sampling Descriptive statistics are measurements that are recorded on a naturally occurring numerical scale they can only be classi ed into one of a group of categories Descriptive statistics draws conclusions about the sets of data based on sampling Inferential statistics summarizes the information revealed in data sets Choose the correct answer below Qualitative data are data from a population while qualitative data are data from a sample Quantitative data are categorical in nature while qualitative data are numerical in nature Quantitative data are collected from an observational study while qualitative data are from a designed experiment Quantitative data are numerical in nature while qualitative data are categorical in nature Quantitative data are collected from a designed experiment while qualitative data are from an observational study Quantitative data are data from a sample while qualitative data are data from a population Choose the correct answer below A population is a set of units of interest to a study A variable is a subset of the units of a population A population is a set of units of interest of a study A variable is an object upon which data is collected A population is a set of units of interest of a study A variable is a characteristics or property of the units being studied A variable is a set of units of interest to study A population is a characteristic or property of the units being studied Choose the correct answer below A sample is a set of measurements that are recorded on a naturally occurring numerical scale A population is a set of measurements that cannot be measured on a natural numerical scale they can only be classi ed into one of a group of categories A sample is a set of units of interest to a study A population is a subset of the units of a sample C A population is a set of units of interest of a study A sample is a subset of the units of a population D A population is an object upon which data is collected A sample is a characteristics or property of an individual experimental unit Choose the correct answer below A A representative sample is a subset of the units of a population B A representative sample is a sample that exhibits characteristics typical of those possessed by the population of interest C A representative sample is a set of units of interest of study D A representative sample of n experimental unites is a sample from the population in such a way that every different sample of size n has an equal chance of selection Choose the correct answer below A A process is categorical in nature A population is numerical in nature B A process produces or generates output over time A population is a process whose operations or actions are unknown or unspeci ed C A population is a set of existing units A process produces or generates output over time D A population is a set of existing units A process is a subset of population Choose the correct answer below A Statistical thinking is a series of actions or operations that transforms inputs or outputs B Statistical thinking is a statement about the degree of uncertainty associated with statistical inference C Statistical thinking utilizes sample data to make estimates decisions predictions or other generalizations about a larger set of data D Statistical thinking involves applying rational thought and the science of statistics to critically assess data and inferences Suppose you39re given a data set that classi es each sample unit into one of the four categories A B C or D You plan to create a computer database consisting of these data and you decide to code the data as A 1 B 2 C 3 and D 4 Are the data consisting of the classi cations A B C D qualitative or quantitative After the data are input as 1 2 3 or 4 are they qualitative or quantitative Are the data consisting of the classi cation A B C D qualitative or quantitative A Qualitative because they are measured on a naturally occurring numerical scale B Quantitative because they can only be classi ed into categories C Qualitative because they can only be classi ed into categories D Quantitative because they are measured on a naturally occurring numerical scale After the data are input as 1 2 3 or 4 are they qualitative or quantitative A Qualitative because they cannot be meaningfully added subtracted multiplied or divided B Quantitative because they are measured on a naturally occurring numerical scale C Qualitative because they are measured on a naturally occurring numerical scale D Quantitative because they cannot be meaningfully added subtracted multiplied or divided 10ldentify each of the following variables as qualitative or quantitative apem A B C D Number of children in family NaUvelanguage Number of pets in family Luclq day of the week Is the variable qualitative or quantitative Why A Number of children in family is a quantitative variable Its values are numerical Number of children in family is a qualitative variable lts values are numerical Number of children in family is a quantitative variable lts values are not numerical Number of children in family is a qualitative variable lts values are not numerical B Is the variable qualitative or quantitative Why A B C D Native language is a qualitative variable lts values are numerical Native language is a quantitative variable lts values are numerical Native language is a qualitative variable Its values are not numerical Native language is a quantitative variable lts values are not numerical C Is the variable qualitative or quantitative Why A B C D Number of pets in family is a quantitative variable Its values are numerical Number of pets in family is a qualitative variable lts values are numerical Number of pets in family is a qualitative variable lts values are not numerical Number of pets in family is a quantitative variable lts values are not numerical D Is the variable qualitative or quantitative Why A B C D Lucky day of the week is a qualitative variable Its values are not numerical Luclq day of the week is a quantitative variable lts values are not numerical Luclq day of the week is a quantitative variable lts values are numerical Luclq day of the week is a qualitative variable lts values are numerical 10b Identify each of the following variables as qualitative or quantitative a Profession b Size of home c Distance of commute to work d Gender A Is the variable qualitative or quantitative Why Profession is a qualitative variable Its values are numerical Profession is a quantitative variable Its values are not numerical Profession is a quantitative variable Its values are numerical Profession is a qualitative variable Its values are not numerical B Is the variable qualitative or quantitative Why Size of home is a quantitative variable Its values are numerical C Is the variable qualitative or quantitative Why Distance of commute to work is a quantitative variable Its values are numerical D Is the variable qualitative or quantitative Why Gender is a qualitative variable Its values are not Numerical 11Each month interviewers visit about 39000 of the 93 million households in the region and question the occupants over 18 years of age about their marriage status Their responses enable the interviewers to estimate the percentage of people in the labor force who are married Complete parts a through c a De ne the population of interest to the interviewers A All people in the region who are over 18 years old B Marriage status C The 93 million households in the region D The 39000 households visited in the region b What variable is being measured A The 93 million households in the region B The 39000 households visited in the region C All people in the region who are over 18 years old D Marriage status Is it quantitative or qualitative Qualitative Quantitative c Is the problem of interest to the interviewers descriptive or inferential Descriptive lnferential 20 The salaries of superstar professional athletes receive much attention in the media The multimilliondollar longterm contract is now commonplace among this elite group Nevertheless rarely does a season pass without negotiations between one or more of the players associations and team owners for additional salary and fringe bene ts for all players in their particular sports Complete parts a and b below a If a players association wanted to support its argument for higher quotaveragequot salaries which measure of central tendency do you think it should use Why A The players association would want to use the mode to support its argument for higher quotaveragequot salaries because the mode is the value that occurs most often This is the preferred measure of center because it most accurately depicts the players salaries and would be most likely to result in a higher pay increase B The players39 association would want to use the mean to support its argument for higher quotaveragequot salaries the mean is the average value of all salaries This is the preferred measure of center because it most accurately depicts the players39 salaries and would be most likely to result in a higher pay increase C The players association would want to use the median to support its argument for higher quotaveragequot salaries the median is the value at which half of the data values are higher than it This is the preferred measure of center because it most accurately depicts the players salaries and would be most likely to result in a higher pay increase b To refute the argument which measure of central tendency should the owners apply to the player salaries A To refute the argument the owners should use the median because the median is the value at which half of the data values are higher than it The median is affected by extreme values so using the median would most likely result is a lower pay increase B To refute the argument the owners should use the mean because the mean is the average value of all the player s salaries The mean is affected by extreme values so using the mean would most likely result in a lower pay increase C To refute the argument the owners should use the mode is the value that occurs most often The mode is affected by extreme values so using the mode would most likely result in a lower pay increase

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