# Test Answers on statistics

Index of Qualitative Variation A measure of variability for normal variables The IQV is a single number that expresses the diversity of a distribution The IQV ranges from 0 to 1 An IQV of 0 would indicate that the distribution has NO diversity at all An IQV of 1 would indicate that the distribution is […]

Read moreStatistics a set of procedures used by social scientists to organize, summarize and communicate information Data information represented by numbers, which can be the subject of statistical analysis Research Process a set of activities in which social scientists engage to answer questions, examine ideas, or test theories. Empirical Research Research based on evidence that can […]

Read moreobservational study a study based on data in which no manipulation of factors has been employed retrospective study an observational study in which subjects are selected and then their previous conditions or behaviors are determined. Retrospective studies need not be based on random samples and they usually focus on estimating differences between groups or associations […]

Read moreIBS Exercise 10 Q 1:What percentage of the females had scores at and below 27-28 6.1 IBS Exercise 10 Q 2:(Refer to table #3 ) What percentage of the males had scores at and below 27-28? 11.2 IBS Exercise 10 Q 4:(Refer to table #3 ) Based on the total sample, what is the percentile […]

Read moreMeasure of Center is a value at the center or middle of a data set Arithmetic \”Mean\” a set of data is the measure of center found by adding the data values and dividing the total by the number of data values Median a data set is the measure of center that is the middle […]

Read moreSuppose we wish tomtest the hypothesis H0:mu=10 versus Ha:mu< 10, where mu represents the mean age of non-highschool aged children who are members of a large gymnastics club in a metropolitan area. Assume age follows a normal distribution with std. Deviation of a population=2. A random sample of 16 ages is drawn from the population, […]

Read moreB A level 0.90 confidence interval is A) any interval with margin of error ± 0.90. B) an interval computed from sample data by a method that has probability 0.90 of producing an interval containing the true value of the parameter of interest. C) an interval with margin of error ± 0.90, which is also […]

Read morePopulation The entire group that is the target of interest, not just people. Eg, \”the population of 1 bedroom apartments\” Sample A subgroup of the population. Eg, \”the 1 bedroom apartments with dishwashers.\” Steps in the statistics process 1. PRODUCE DATA (by studying a sample of the population) 2. EXPLORATORY DATA ANALYSIS (Summarize data.) 3. […]

Read moreResidual Observed minus predicted. Response variable Measures the outcome of a study. Explanatory variable May help explain or influence changes in a response variable. 1 Area of a density curve. 68, 95, 99.7 Rule for area of normal distributions. Cluster A population divided into small groups ideally reflecting the characteristics of the population. Strata Groups […]

Read morequestion QUANTITATIVE answer Determine whether the following examples of data are quantitative or qualitative. Write “QUANTITATIVE” for quantitative and “QUALITATIVE” for qualitative. (without quotations) (a) Your college GPA. question QUANTITATIVE answer Determine whether the following examples of data are quantitative or qualitative. Write “QUANTITATIVE” for quantitative and “QUALITATIVE” for qualitative. (without quotations) (b) The amount […]

Read morequestion Data consists of MOC information observed by Count Chocula where does it come from? answer Measurements or responses Observations Counts question What science is the collecting, organizing, analyzing, and interpreting data in order to make decisions? answer Statistics question 2 Types of data sets used when studying statistics answer Population Sample question What is […]

Read morequestion Qualitative Data answer This can be placed into distinct categories according to some characteristics or attributes (NONNUMERICAL data). question Quantitative Data answer This can be ordered or ranked (NUMERICAL data) question Determine whether the data are qualitative or quantitative. The number of complaint letters received by the United States Postal Service on a given […]

Read morequestion define statistics answer statistics is the science of collecting, organizing, summarizing, and analyzing information to draw a conclusion and answer questions. in addition, statistics is about providing a measure of confidence in any conclusions question individual answer a person or object that is a member of the population being studied question descriptive statistics answer […]

Read morequestion T/F a statistic is a numerical summary of a population answer false, sample taken from population question T/F the standard deviation can be negative answer false question if a data set with more than one standard observation has a standard deviation of s=0, what does that imply about the data set? answer they all […]

Read morequestion You are trying to study the amount of financial aid students at your University receive. You sample 50 students and find out the average size of their financial aid packages. The average of your sample is a __________. answer sample statistic. question You are doing a study for a non-profit group helping at-risk children […]

Read morequestion Dot Plot answer A set of data represented by using dots over a number line. The number of dots over the number line tells the value of the data points. question Stem plot answer -A plot where each data value is split into a “leaf” (usually the last digit) and a “stem” (the other […]

Read morequestion 1. The Sample with the Built-in Bias answer Response Bias: Tendency for people to over- or under-state the truth Non-response: People who complete surveys are systematically different from those who fail to respond. Accessibility/Pride. Representative Sample: One where all sources of bias have been removed. (Literary Digest) Questionnaire wording/Interviewer effects Recall Bias: Tendency for […]

Read morequestion True or False? Epidemiology is an observational science that capitalizes on naturally occurring situations. answer true question The individual whose name is associated with a natural experiment during an outbreak of cholera in London was: answer John Snow question Which of the following is NOT considered a use of epidemiology: answer To provide healthcare […]

Read morequestion Observational Studies answer 1. Cross-sectional 2. Case-control 3. Cohort 4. Twin concordance 5. Adoption question Observational Studies, Temporality 1. Cross-sectional 2. Case-control 3. Cohort 4. Twin concordance 5. Adoption answer 1. Cross-sectional: Prospective 2. Case-control: Retrospective 3. Cohort: Prospective, Retrospective 4. Twin concordance: Prospective, Retrospective 5. Adoption: Prospective, Retrospective question Observational Studies, Measures 1. […]

Read morequestion Define Statistics answer The science of collecting, organizing, summarizing, and analyzing information to draw conclusions or answer questions. In addition, statistics is about providing a measure of confidence in any conclusions. question Define Data answer A fact or proposition used to draw a conclusion or make a decision. question Descriptive Statistics answer Consists of […]

Read morequestion biased answer any systematic failure of a sampling method to represent its population question block answer when groups of experimental units are similar, they are gathered into these groups question census answer a sample that consists of the entire population question cluster answer sampling design in which entire groups are chosen at random question […]

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