Statistics

α: - ANSWER-The symbol for level of significance (probability of a type I error). Alternative Hypothesis - ANSWER-The hypothesis that the researcher wants to prove or verify; a statement about the value of a parameter that is either "less than," "greater than," "not equal to." β: - ANSWER-The probability of failing to reject a false null hypothesis (probability of a type II error). Confidence Interval - ANSWER-An estimate of the value of a parameter in interval form with an associa...

How do you check if there is outliers?calculate IQR; anything above Q3+1.5(IQR) or below Q1-1.5(IQR) is an outlier If a graph is skewed, should we calculate the median or the mean? Why?median; it is resistant to skews and outliers If a graph is roughly symmetrical, should we calculate the median or the mean? Why?mean; generally is more accurate if the data has no outliers What is in the five number summary?Minimum, Q1, Median, Q3, Maximum Relationship between variance and standard devia...

The manufacturer of a soccer ball claims that only 3% of the soccer balls produced are faulty. An employee of this company examines the long-run relative frequency of faulty soccer balls produced as shown in the graph.Which conclusion can be drawn from this graph?The company's claim seems to be true because the graph shows that when 50 soccer balls were tested, only about 3% of them were faulty.We should not believe the company's claim that only 3% of their soccer balls are faulty be...

Explain the difference between a population and a sample.A population is the entire group that is being studied while a sample is a subset of the population that is being studied. A(n) _________ is a person or object that is a member of the population being studied.Individual ________ statistics consists of organizing and summarizing information collected, while ________ statistics uses methods that generalize results obtained from a sample to the population and measure the reliability...

Alicia would like to know if there is a difference in the average price between two brands of shoes. She selected and analyzed a random sample of 40 different types of Brand A shoes and 33 different types of Brand B shoes. Alicia observes that the boxplot of the sample of Brand A shoe prices shows two outliers. Alicia wants to construct a confidence interval to estimate the difference in population means. Is the sampling distribution of the difference in sample means approximately norm...

Positive correlation As one variable increases, the other variable increases Negative correlation As one variable increases, the other decreases A point on the scatter plot represents how many values? 2 (X and Y) Relationship between linear and scatter plot diagrams? The regression line is the bestfitting line through a scatter plot If you see the notation (E X)(E Y) what should you do? First sum the Xs, then sum the Ys, then multiply the sums If you see the notation E XY what should you...

Statistics Exam Questions With 100% Correct Answers 35 - answerWhat is the IQR (Q3-Q1) for this data set: 52, 72, 96, 21, 58, 40, 75? 40 - answerWhat is Q1 for this data set: 52, 72, 96, 21, 58, 40, 75? 75 - answerWhat is Q3 for this data set: 52, 72, 96, 21, 58, 40, 75? 58 - answerWhat is the median for this data set: 52, 72, 96, 21, 58, 40, 75? 4 - answerWhat is the IQR (Q3-Q1) for this data set: 20, 21, 18, 17, 20, 15, 56? 17 - answerWhat is Q1 for this data set: 20, 21, 18, 17, 20, 15...

Statistics Summary Ch 4 Exam With Complete Solutions Mean - answerThe arithmetic average of a data set. Most common measure of central location. To calculate the mean - answerAdd up all the values in the data set and then divide by the number of observations. Notation - answerseries or system of written symbols used to represent numbers, amounts, or elements in something such as music or mathematics. Numerical summaries of shape are - answernot covered because they are seldom used in pr...

Intro to Summary Statistics Exam With Complete Solutions summary statistics - answercollection, evaluation, and interpretation of data, statistical analysis of measurements can verify the quality of a design process central tendency - answermean, median, mode Variation - answerspread of values around the center range, standard deviation, IOR - answerexamples of variation distribution - answersummary of the frequency of values frequency tables, histograms, normal distribution - answerexam...

Summary statistics Exam Questions With 100% Correct Answers Summary statistics - answer- The first thing you want to do in Data analysis - describe data sets or relationships between variables with one or a few numbers: - What is the central value? - How widely are values spread from the center? - Are there data that are very atypical? - Are variables related? Why central tendency? - answer- You can't report the 1000 values to your boss! - Describe a whole set of data with a single val...