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...

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...

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...

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 integers? : -2 50 ...

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 integers? : -2 50 ...

Categorical variables that there is no natural order among the categories : nominal variables Categorical variables where there is natural order among the categories (low-high) : ordinal variable A measurement which makes sense to talk about the difference between values but not the ratio between values : interval Quantitive variables where is makes sense to talk about the difference in ratios. (Income, weight) : ratio Value 0 means the absence of quantity (income $0) : In ratios: ...

nominal variables : Categorical variables that there is no natural order among the categories ordinal variable : Categorical variables where there is natural order among the categories (lowhigh) interval : A measurement which makes sense to talk about the difference between values but not the ratio between values ratio : Quantitive variables where is makes sense to talk about the difference in ratios. (Income, weight) In ratios: 2 | P a g e : Value 0 means the absence of quantity...

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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...

Ch 1 Intro to Statistics Questions and answers latest update