Introduction to Statistics Guías de estudio, Notas de estudios & Resúmenes

Statistics Questions & Answers 13 - ANSWER: What is the lower class limit in the class 13-17? 35.5 - ANSWER: Using the class 23-35, what is the upper class boundary? 52 - ANSWER: A linear regression line y = 0.8x - 10 is computed to predict the final exam score y on the basis of the first score x on the first test. Suppose Maria scores a 78 on the first test. What would be the predicted value of her score on the final exam? 88 - ANSWER: A linear regression line y = 10 + 0.9x is computed to...

Statistics test 3 Questions & Answers d) Determine the probability that a randomly selected multiple birth for women 15-54 years old involved a mother who was at least 40 years old. Interpret this result. Is it unusual? Find the probability that a randomly selected multiple birth for women 15-54 years old involved a mother who was at least 40 years old. - ANSWER: use disjoint 1) Is the following a probability model? 2) What do we call the outcome "brown"? red- 0.2 green- 0.2 blue- 0.1...

Statistics Review Questions & Answers A biology class conducted an experiment to determine if playing classical music had an effect on the hatching rate of chicken eggs. Here are their results.Let event A = Music and event B = Hatched.Calculate the following:P(A|B) = - ANSWER: .589 A biology class conducted an experiment to determine if playing classical music had an effect on the hatching rate of chicken eggs. Here are their results.Let event A = Music and event B = Hatched.Calculate the ...

Statistics Questions & Answers A company claims that a quarter of the bolts sent to them are faulty. To test this claim the number of faulty bolts in a random sample of 50 is recorded. Give two reasons why a binomial distribution may be a suitable model for the number of faulty bolts in the sample. (2 marks) - ANSWER: • Each bolt is either faulty or not faulty. • The probability of a bolt being faulty (or not) may be assumed constant. • Whether one bolt is faulty (or not) may be assu...

AP Statistics Questions & Answers 5 step process: z/t test - ANSWER: State --> Ho/Ha, define parameter Plan --> one sample, z test Check --> random/normal/independent Do --> find p hat, find test statistic (z), use test statistic to find p-value Conclude --> p value ≤ α reject Ho p value ≥ α fail to reject Ho a point estimator is a statistic that... - ANSWER: provides an estimate of a population parameter. addition rule for mutually exclusive events P (A U B) - ANS...

Statistics Chapter 2 Questions & Answers A _____ chart is useful for displaying a frequency distribution for a nominal variable. - ANSWER: Bar A _____ chart is useful for displaying a frequency distribution for a qualitative variable. - ANSWER: Bar A ______ chart is useful for displaying a relative frequency distribution. - ANSWER: Pie A ___________ is useful for displaying the relative frequency distribution for a nominal variable. - ANSWER: Pie chart A class interval, or class width, c...

Statistics Questions & Answers A ______________ is a quantitative variable that has either a finite number of possible values or a countable number of possible values (countable). - ANSWER: discrete variable A _______________ is a quantitative variable that has an infinite number of possible values that are not countable (measurable). - ANSWER: continuous variable A sample in which the individuals are easily obtained and not based on randomness is ______________. - ANSWER: convenience samp...

Statistics Questions & Answers A frequency histogram will be the same as a relative frequency histogram, except - ANSWER: the values on the vertical axis will be different. A parameter is? - ANSWER: a numerical description of a population characteristic. A population is the collection of - ANSWER: ALL outcomes, responses, measurements, or counts that are of interest. A statistic is ? - ANSWER: a numerical description of a sample characteristic A student's score on an actuarial exam is in...

Statistics Chapter 1 Questions & Answers A study is conducted to measure children's growth rates without any treatment applied to the children. What best classifies this study? - ANSWER: Observational Study A study of an association between which ear is used for cell phone calls and whether the subject is left-handed or right-handed began with a survey e-mailed to 5000 people belonging to an otology online group, and 717 surveys were returned. (Otology relates to the ear and hearing.) Wha...

Statistics Questions & Answers __________ occurs when random chance produces a sample statistic that is not equal to the population parameter it represents - ANSWER: Sampling error "the bigger they are, the harder they fall" describes... - ANSWER: A positive linear correlation "The more you save, the less you spend" describes... - ANSWER: a negative linear correlation "the self-confidence of a group of students is positively correlated with their chances of getting through the course...