Statistics Samenvattingen, Aantekeningen en Examens

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...

STA 296 Final Exam Question & Answers A - ANSWER: 210 first-year college students were randomly assigned roommates. For the 78 students assigned to roommates who brought a video game to college: average GPA after the first semester was 2.84, with a standard deviation of 0.669. For the 132 students assigned to roommates who did not bring a video game to college, average GPA after the first semester was 3.105, with a standard deviation of 0.625. We are interested in 90% confidence interval fo...

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...

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 correlationAs one variable increases, the other variable increases Negative correlationAs 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 do?F...

A study was conducted to see if gender influences the number of alcoholic beverages consumed per day. Which type of classification is this? : Categorical, categorical (Categorical, quantitative) Quantitative, categorical Quantitative, quantitative Given the following set of numbers: 25, 2.5, -2, and -1 what is the product of the integers? 250 50 100 2 | P a g e

A study was conducted to see if gender influences the number of alcoholic beverages consumed per day. Which type of classification is this? : Categorical, categorical (Categorical, quantitative) Quantitative, categorical Quantitative, quantitative Given the following set of numbers: 25, 2.5, -2, and -1 what is the product of the integers? 250 50 100 2 | P a g e -2 : Given the following set of numbers: 25, 2.5, -2, 2, and -1 What is the product of the intege

Based on the results shown, what do you think the relationship is between age and depression? a) It is positively correlated b) It is negatively correlated c) No correlation d) Can't tell from this display : The correct answer is d. We can not determine the relationship between age and depression as we don't know how the data pair up. The other question answer choices cannot be determined because to assess correlation we need to be able to see how the data is paired. A car compan...

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...

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...