Guías de estudio, Notas de estudios & Resúmenes

Statistics Chapter 1 Questions & Answers Advantages of bar graph when compared to a pie chart - ANSWER: Both graphs can display the distribution of a categorical variable, but a bar graph can also compare any set of quantities that are measured in the same units. Are quartiles/IQR resistant? - ANSWER: Yes because they are not affected by a few extreme observations Association - ANSWER: There is an association b/w 2 variables if specific values of one variable tend to occur in common with ...

Statistics Symbols Questions & Answers 1 - ANSWER: CDF of a Poisson— it will never equal __, it will only approach it (doesn't have a stopping point) 1 - F(a) - ANSWER: P(X greater than or equal to a) 1. "Is it counting a # of successes?" 2. "Do I have a finite Bernoulli Process?" i. "are there a finite # of trials?" ii. "do I have only 2 outcomes?" iii. "is there constant probability?" iv. "are the trials independent?" - ANSWER: how to determine if your distribution is b...

Statistics Chapter 9 Questions & Answers A 95% confidence interval for the ages of six consecutive presidents at their inaugurations is about (48.4, 54.2). Either interpret the interval or explain why it should not be interpreted. - ANSWER: It should not be interpreted. The data are not a random sample and so inference based on a confidence interval is not possible. A 95% confidence interval is equivalent to which of the following hypothesis tests? - ANSWER: A two-tailed test with a signif...

Statistics Questions & Answers A group of subjects to which researchers apply a treatment in an experiment - ANSWER: Treatment group A market researcher interviews each member from each of the five randomly chosen neighborhoods throughout a city. - ANSWER: Cluster Sampling A response to the power of suggestion, rather than the treatment itself, by participants of an experiment - ANSWER: Placebo effect A study in which data are obtained from every member of the population - ANSWER: Census ...

Statistics Questions & Answers A class interval, which is the width of a class, can be determined by subtracting the lower limit of a class from the lower limit of the next higher class. - ANSWER: A difference between calculating the sample mean and the population mean is - ANSWER: Only in the symbols, we use n instead of N. A disadvantage of the range is - ANSWER: Only two values are used in its calculation. A discrete variable is - ANSWER: Can assume only certain clearly separated values...

Intro. to Statistics MCCC Ch. 1 Questions & Answers - is used when subjects are assigned to different groups through a process of random selection. - ANSWER: randomization A handler loads one item every 15 minutes, so 160 items are completed in her first week of work. Her manager checks her work by randomly selecting a day of the week, then reviewing all the items she completed that day. Does this a sampling plan result in a random sample? Simple random sample? Does this sampling plan re...

Statistics Mid-term Questions & Answers ______are the categories by which data are grouped. - ANSWER: Classes _____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 of the results. - ANSWER: Descriptive; inferential (Describe what the line will look like) Match the coefficient of determination to the scatter diagram. The scales on the x-axi...

Statistics Questions & Answers Binomial Experiment - ANSWER: Experiment with a fixed number of trials, 2 outcomes, constant probability of success, and trials are independent. Chebysheffs Theorem - ANSWER: (1-1/K^2) of the data's values lie withink K standard deviations. Cluster Sampling - ANSWER: The members of a subset (cluster) are heterogenous; a random sample of clusters is taken and the members of the selected clusters constitute the sample for the study. Coefficient of Determinat...

Statistics Questions & Answers Binomial Experiment - ANSWER: Experiment with a fixed number of trials, 2 outcomes, constant probability of success, and trials are independent. Chebysheffs Theorem - ANSWER: (1-1/K^2) of the data's values lie withink K standard deviations. Cluster Sampling - ANSWER: The members of a subset (cluster) are heterogenous; a random sample of clusters is taken and the members of the selected clusters constitute the sample for the study. Coefficient of Determinat...

Statistics Ch. 1 - Data collection Questions & Answers anecdotal - ANSWER: the information being conveyed is based on casual observation, not scientific research approach - ANSWER: a way to look at and organize a problem so that it can be solved. bias - ANSWER: the results of the sample are not representative of the population blinding - ANSWER: nondisclosure of the treatment an experimental unit is receiving case-control studies - ANSWER: Retrospective studies that require individuals to ...