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STAT 201 Practice Tests for Test 1 questions and answers Graded A+
NuevoSTAT 201 Practice Tests for Test 1 questions and answers Graded A+ What is the difference between population and parameter in a province health survey? -Population = 3.9 million residents; Parameter = true proportion satisfied. Which statement is NOT true about left-handed Americans? -The proportion of all Americans who are left-handed constitutes a sample. What is the definition of descriptive statistics? -Using statistics to summarize collected data. What is the population in a vaccin...
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STAT 201 Midterm (Exam) 1 questions and answers Graded A+
NuevoSTAT 201 Midterm (Exam) 1 questions and answers Graded A+ In our data, what are our individuals? -the objects described by a set of data (not necessarily people). What are our variables? -are the characteristics of an individual. What are the two different types of variables we have? -Numeric (quantitative) and categorical (qualitative) A researcher wants to learn about the kinds of students that go to Texas A&M. He does an observational study of 50 students at A&M. He asks them their ag...
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STAT 201 HW 7 questions and answers Graded A+
NuevoSTAT 201 HW 7 questions and answers Graded A+ Using the information below, answer the next following questions The U.S. Census Bureau conducts a study to determine the time needed to complete the shortform. The Bureau surveys 200 people. The sample mean is 8.2 minutes. There is a known standard deviation of 2.2 minutes. The population distribution is assumed to be normal. Identify the following: A. X= B. sigma= C. n= -X= 8.2
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STAT 201 HW 1 questions and answers Graded A+
NuevoSTAT 201 HW 1 questions and answers Graded A+ For each of the following exercises, find matches for the following: A cardiologist is interested in the mean recovery period of her patients who have had heart attacks. i. X = the mean recovery period of one patient ii. values for X, such as 10 days, 14 days, 20 days, and so on iii. a group of the cardiologist's patients iv. the mean recovery period of all of the cardiologist's patients v. the mean recovery period of the group of the ...
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STAT 201 final questions and answers Graded A+
NuevoSTAT 201 final questions and answers Graded A+ True or false? You want to test
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Stat 201 Exam 3 questions and answers Graded A+
NuevoStat 201 Exam 3 questions and answers Graded A+ What type of charts are useful for displaying categorical data? -pie chart, bar chart What type of display is useful for displaying quantitative variables, specifically to look at the shape, center, and spread of a distribution of data? -histogram What type of display is useful for allowing a user to recognize individual data points (this type works better with small data sets)? -stem and lead plot What type of display is useful for graphic...
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Stat 201 Exam 2 questions and answers Graded A+
NuevoStat 201 Exam 2 questions and answers Graded A+ Probability Distributions -have to be in between 0 and 1 must sum up to 1 What is the mean of a discrete probability distribution? -also known as expected value it represents: what we expect the average to be over the long run not necessarily what you expect to observe in a single observation
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STAT 201 Exam 1 questions and answers Graded A+
NuevoSTAT 201 Exam 1 questions and answers Graded A+ What is the difference between a population and a sample? -A population includes every individual in the group of interest. A sample is only a subset of that group. If a dataset contains all men's basketball players in a season, is it a sample? - No, it represents the population, not a sample. What is a categorical variable? -A variable that describes groups or labels, not numerical amounts. What is a discrete quantitative variable? -A ...
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STAT 201 Exam 1 questions and answers Graded A+
NuevoSTAT 201 Exam 1 questions and answers Graded A+ What is statistics? -the art and science of collecting, presenting, and analyzing data to answer an investigative question What is data? -The information gathered with experiments and surveys What are the three main components of statistics? -Design, description, and inference What is design? -Stating the question of interest and planning how to obtain the data needed to answer that question
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Stat 201 Exam 1 questions and answers Graded A+
NuevoStat 201 Exam 1 questions and answers Graded A+ Subject -entities that we measure in a study (family in US that has kids in school) Variable -any characteristic that is observed for the subjects in a study (spending plan - spend more or less than last year) Population -the set of all subjects of interest (all families in US) Sample -the set of subjects for which we have data (1,080 adults who were surveyed)
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STAT 201 Exam 1 questions and answers Graded A+
NuevoSTAT 201 Exam 1 questions and answers Graded A+ Descriptive Statistics numerical data used to measure and describe characteristics of groups Inferential Statistics numerical methods used to determine whether research data support a hypothesis or whether results were due to chance Parameter numerical summary of a population Statistic a numerical measurement describing some characteristic of a sample Categorical Variable places an individual into one of several groups or categories (wo...
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STAT 201 Exam 1 questions and answers Graded A+
NuevoSTAT 201 Exam 1 questions and answers Graded A+ What are the types of studies? -Observational and experimental. What is the sample mean? -The average of a set of sample values, calculated by summing the values and dividing by the number of values. What is sample variance? -A measure of how much the sample values vary from the sample mean, calculated by averaging the squared differences from the mean. What is sample standard deviation? -The square root of the sample variance, indicating ...
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stat 201 exam 1 questions and answers Graded A+
Nuevostat 201 exam 1 questions and answers Graded A+ Population -The entire group of individuals or items of interest in a study. Sample -A subset of the population that is actually studied. Descriptive Statistics -Methods used to summarize or describe data (graphs, mean, median, etc.). Inferential Statistics -Methods that use sample data to make conclusions about a population. Parameter -A numerical value that describes a population.
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Stat 201 Exam 1 questions and answers Graded A+
NuevoStat 201 Exam 1 questions and answers Graded A+ categorical type of data that sections items or people in to groups. sample collected to make inferences about a population. direction, shape, form what are the ways to describe bivariate quantitative data? True True or False: Outliers can make a weak correlation strong. identifier data categorical data with a unique value for each observation; Examples: Social
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Stat 201 Exam 1 questions and answers Graded A+
NuevoStat 201 Exam 1 questions and answers Graded A+ What is a population? the set of subjects of interest "all" or "every" What is a sample? a subset of the population for whom we have (or plan to have) data, often randomly selected "a sample of" or "survey of" What is descriptive statistics? refers to method of summarizing the collected data (where the data could be a
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Stat 201 Exam 1 questions and answers Graded A+
NuevoStat 201 Exam 1 questions and answers Graded A+ subject -entity that we measure in a study variable -any characteristic that is observed for subjects in a study population -the set of all subjects of interest sample -the set of subjects for which we have data statistic -numeric summary of a sample (sample)
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Stat 201 Exam 1 questions and answers Graded A+
NuevoStat 201 Exam 1 questions and answers Graded A+ Sample - A subset of a population used to collect data Population - The entire group of individuals or items of interest Statistic - A numerical value calculated from a sample Parameter - A numerical value that describes a population Descriptive Statistics - Methods used to organize, summarize, and describe data Inferential Statistics - Methods that use sample data to make conclusions about a population Categorical Variable - A variable t...
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STAT 201 EXAM 1 questions and answers Graded A+
NuevoSTAT 201 EXAM 1 questions and answers Graded A+ Data can be represented as -numbers, characters, images, or other labels All data needs -context We use a ___ to make inferences about the population -sample The sample should be ___ of a population -representative Who do statisticians use randomness when selecting a sample? -to create a representative sample and reduce bias
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Stat 201 Exam 1 questions and answers Graded A+
NuevoStat 201 Exam 1 questions and answers Graded A+ What phrase helps identify quantitative variables 'how much'-real numbers, things you can do math on 3 types of Categorical variables 1. ordinal: put in order (steak pref, grades, rank) 2. nominal: no order (type of fruit, veg) 3. identifier: group of one, CAN'T REPEAT (social sec, utk net id) 2 types of Quantitative variables 1. Continuous (can have decimals) 2. Discrete (has to be whole numbers) UTK uses your student id number...
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Stat 201 Exam 1 questions and answers Graded A+
NuevoStat 201 Exam 1 questions and answers Graded A+ identifier -categorical with one individual in one category (SSN): categorical -possible values are given by short descriptions (favorite food, zip codes): quantitative -must be numbers, usually units (weight, price): context -all data needs ____________ to understand it fences -1.5 IQRs above or below Q1 or Q2:
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