Introduction to Statistics Study guides, Study notes & Summaries

Statistics Questions & Answers a correlation coefficient close to 1 is evidence of a cause and effect relationship between the two variables - ANSWER: false a medical study was investigating if getting a flu shot actually reduce the risk of developing the flu. From a group of adult volunteers, researchers randomly assigned half to receive an injection that contain the drug believed to reduce the risk of getting the flu and the other half to receive an injection containing no active ingredi...

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...