Stat 111 or Stat 135 - Introduction to Statistics . a) has fatter tails than a Z distribution b) it is symmetric and mound shaped c) it is centered at zero d) as the degrees of freedom increase it becomes less like a Z distribution. Not seeing the question you're looking for? Ho: mean starting age is greater than or equal to 19. Part A. Explain in detail the predictor variable or explanatory variable. Start studying Statistics Final Exam. The Journal of the American Medical Association reported on the results of a National Health Interview Survey designed to determine the prevalence of smoking among U.S. adults. Z c. Morphet's Q d. F e. Chi. Business Statistics Final Exam Solutions December 17, 2008 1 For questions 1-3, indicate the type of data described. Explain. Let p be the proportion of calls to business people for which the caller reaches the person being called on the first try. If not, you will receive a significant grade reduction. a. (2 m, 19.5 m/s) (3 m, 26.2 m/s) (4 m, 30.1 m/s) (5 m, 35.1 m/s) (6 m, 39.7... Name two ways to decrease the width of the confidence interval. agus99. Find the probability of getting: a. exactly 4 heads b. less than 4 heads (4 is not included), Interpret the following 95% confidence interval for mean weekly salaries of shift managers at Guiseppe's Pizza and Pasta. True or false: If an x variable has a Normal distribution, then z = (x- \mu) \sigma (x-\mu)\sigma has a Standard Normal distribution. F_2 vec has a magnitude of... Test the null hypothesis that the slope of the regression line is zero at the 0.01 significance level. Find the value for the 3s quartile Q. A. True or false: We use the table for the Standard Normal distribution to get areas for any Normal distribution. Using the data set below, test the claim that Wimbledon Match Lengths are longer than 2 hours. What is the probability that true null hypothesis will be accepted? The population mean annual salary for environmental compliance specialists is about $58,500. Suppose that a marketing firm sends questionnaires to two different companies. a. a. is 9 b. is 10 c. is 11 d. varies from class to class e. None of the above answers is correct. A random sample of medical files was used to estimate the proportion p of all people who have a given disease and react positively to a new drug. Simple Linear Regression: 1. F_1 vec has a magnitude of 9.80 N and is directed at an angle of = 57.0 above the negative x axis in the 2nd quadrant. It's uniform C. It's bell-shaped D. It's unimodal E. The curve never touches the horizontal a... A gambler pays $5 to play a game of dice. If a random sample of n = 3 students is selected and the first two are bot... A psychology class consist of 14 males and 36 females. Which is the following is correct? Assuming that the population distribution is normal with a known standard deviat... Population data has a normal distribution with a mean of 80 and a standard deviation of 24. Finding the area under a Normal curve in a specified interval. Which of the following statements is true about outliers in linear regression? (a) What is the probability that you get all 5 answers correct? Find the probability that the number who cons... 61% of men consider themselves professional baseball fans. Choose all probability distributions which are theoretically related to the normal distribution. The tallest person ever confirmed by the Guinness records organization was Robert Ludlow of the United States, at 8 feet 11.1 inches tall. If 100 students form a 99% confidence interval. Let X be a random variable whose distribution is Normal with a mean of 100 and a standard deviation of 10. Suppose a researcher wants to learn more about the mean attention span of individuals in some hypothetical population. If the store has eight copies of the program available at the beginning of each weak, what is the probability that demand exceeds the supply in a given week? a) Seat-belt compliance in Massachusetts was 65% in 2008. A sample of 17 items yield = 50.0 grams and s = 2.5 grams. A. a. What can we conclude about a sample mean that falls within the region of rejection? What is the probability that out of 6 exams that Bob takes, he passes 2? You randomly select 10 men and ask each if he considers himself a professional baseball fan. A sample of 20 cartons contained the following amounts in ounces: 27.3, 28.4, 31.1, 31.5, 28.9, 28.3, 32.2, 32.8, 32.6, 31.4, 27.3, 32.2, 32... Often uncovered through ESM are A. Newfound activities B. Unanticipated feelings about activities and unidentified feelings about change processes C. Beliefs about the self D. Predictions about cha... What are the advantages of stratified sampling? (e) All of the above. ANSWER: Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. The villagers noticed that wherever doctors appeared, pe... Let f(x) = 1.9^{1.9x}. how many of them would you expect to capture the true value? True or False: It is easier to reject the null hypothesis if the researcher uses a smaller alpha level. In a population of exam scores, a score of X = 48 corresponds to z = 1.00 and a score of X = 36 corresponds to z = - 0.50. If he rolls a sum of 10 the house pays him $10; if he rolls a sum of 3 the house pays him $20, otherwise he loses. 0.354 C. 0.833 D. 03... Men's heights are normally distributed with mean 69.0 inches and standard deviation 2.8 inches. The standard deviation is 3.5 years. 3 B. Among 58,593 patients who had cardiac arrest during the day 11,604 survived and were discharged. Which of the following illustrates the correct expression of the alternate hypothesis that customers of McDonald's consume more than the national average of 36 hamburgers each year? What is the name of the density curve that models many bell-shaped symmetric distributions? Business Statistics Final Exam Solutions December 17, 2008 4 18. V5A 1S6 Canada Office: K10565 . If a random sample of size 144 is drawn from the population, the probability of drawing a sample with a mean less than 402 is... A worker in the automobile industry works an average 42.8 hours per week. What is the probability that a teen girl uses social networking sites? a) +0.65 b) -0.89 c) +0.10 d) -0.10. Fall 2019. Which of the following distributions are symmetric? Obtain the least squares regression line for us- ing the second exam score to predict the first exam … Which of the following is false? The population standard deviation is unknown. STA 2023 Practice Questions Final Exam 1. © copyright 2003-2021 Study.com. Which of the following is not a property of the t distribution? Height of the curve C. Area on the left. Given a normal distribution with m = 10 and s = 5, what is the probability that the variable is between 5 and 10? Currently, the yield o... A normal population has a mean of 20 and standard deviation 4 a. Compute z values associated with 18, 20 and 25. b. ANS: D DIF: 2 TOP: 3 3. The distinguishing characteristic of a rectangular distribution is that [{Blank}]. Practice Test #4 Answers Practice Test #4b Updated Practice Test #4 Solutions to #3 and #4 Practice Final Exam Practice Final Exam Solutions Practice Final Exam B Practice Final Exam B (ANSWERS) Z-Score Table Statistics Video Lessons Statistics Self Tutoring Site GREAT TUTORING VIDEOS FOR STATISTICS Optional Textbook with Videos A manager records the repair cost for 6 randomly selected VCRs. To run a survey on the online shopping attitudes of people during COVID, which sampling method would work best? d) Decrease variance. If you have any questions or need clarification about the chapter test questions or exam questions, don't hesitate to contact us! Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean mu = 272 days and standard deviation sigma = 18 days. Determine whether the events of getting tails twice are independent or dependent. Construct a 90 percent confidence interval for the percentage of trucks that had bad signal lights. ||Year||Email Users, m (million users) |2005|125.2 |2006|131.1 |2007|133.8 |2008|137.9 |2009|139.8 |2010... Statistics Canada wants to know the unemployment rate in Vancouver during any part of last year. B. be larger. What is the relationship between linear and scatter plot diagrams? (Round your answers to 2 decimal places.) A. equal to B. greater than C. less than, If the density curve is right-skewed, then the mean is [{Blank}] the median. A US Department of Education official is curious about SAT score performance for students attending certain high schools. Suppose your instructor will drop the low test when computing final grades, but he curves grades on each test. Use the Student's t distribution tables. 2. A) F-distribution B) Exponential distribution C) Normal distribution. You are allowed to use a calculator and a two-sided sheet of notes for this exam. (2 pts) Based on your Business Statistics class in the Global MBA program, you know that a confidence interval is wider if: (a) A larger sample (n) is used. True False. What is the meaning of statistical significance in statistics? Given the date below, compute the coefficient of determination, R square, and interpret. The average body length of tabby cats is 18 inches with a standard deviation of 1.0 inches. Test. The time it takes a mechanic to change the oil in a car is exponentially distributed with a mean of 5 minutes. The researcher asked a group of 30 students: 12 of them supported the change, 13 of them d... A die is rolled 360 times. 0 1) The average triglyceride level among diabetes patients is 172 with SD = 36. Eight players are receiving scholarships, and four are not. Past data has shown that the regression line relating the final exam score and the midterm exam score for students who take statistics from a certain professor is: final exam = 50 + (0.5)(midterm). What is the population mean? Your Final Exam will NOT have any multiple choice!) A) Negative binomial distribution B) Uniform distribution C) Hypergeometric distribution, Which of the following distributions are symmetric? Find the score (X value) that corresponds to a z score equal to 0.75. Match. The researches used a random sample of 42 domestic cats. Learn vocabulary, terms, and more with flashcards, games, and other study tools. (1 pt) In a web-based survey, customers are asked to rate your company’s product on the following scale: Excellent, good, average, poor. Fall 2010 Math 130 section 2. Material covered after the second midterm will appear on the final exam. Why can we never be sure that a sample represents a population? The average expenditure in a sam... Assessment of a financial investment opportunity for a merchant bank provides the following estimates of possible profit levels and corresponding probabilities. A. The hypothesis that the number of hours worked is related to student grade point average is a [{Blank}] hypothesis. You are considering buying equity in a firm. One way to qualify for membership is having an IQ at least 2.5 standard deviations above average. What is the probability that the demand will be greater than mu + 2sigma copies in a week? What is negative correlation in statistics? What are the four main assumptions for parametric statistics? 95% confidence; n = 2388, x = 1672. Previous studies indicate that the standard deviation of these ages was 3.1 years. Statics: Final Exams. Introduction To The Practice Of Statistics … - random sampling - stratified sampling, Managers at an automobile manufacturing plant would like to estimate the mean completion time of an. If you make ten different 90% confidence intervals. What do we conclude if the p-value is the same or smaller than the significance level (\alpha)? If you estimate a regression model and find an intercept of 1 and a coefficient of 4, how should you interpret the coefficient of 4? When making predictions using the regression equation, which of the following is NOT advisable? E-mail: mcneney at sfu dot ca I am part of the SFU Statgen Working Group within the Department of Statistics and Actuarial Science . The average expenditure on Valentine's Day was expected to be $100.89 (USA Today, February 13, 2006). The scores on a certain test are normally distributed with mean 61 and standard deviation 3. Explain your reason. When would you use the t-distribution procedure to find the confidence interval for the population … Suppose that the duration of a particular type of criminal trial is known to have a mean of 21 days and a standard deviation of seven days. Which of the following illustrates the correct expression of the null hypothesis for the alternate hypothesis that more than 40% of Internet users shop online? 175,600 c. 3,840,500 d. 2,947,000. Course. Fall 2014. What is the probability of one of your tickets being randomly selected? Learn vocabulary, terms, and more with flashcards, games, and other study tools. Explain the trade-off between accuracy and cost/time of sample size in using a sample to make inferences about a population. If their average response time was 1.0 seconds with a standa... What is meant by the "possible states of nature"? Confidence intervals are useful when trying to estimate _____. We randomly sample nine trials. And why? Fall 2012. Define standard error of measurement; standard error of the mean; and discuss the term confidence interval. If a z-score is negative, the area to its right is [{Blank}] (greater than/less than) 0.5. A national computer retailer believes that the average sales are greater for salesperson w... A psychiatrist believes that 80% of all Americans who visit doctors have problems of a psychosomatic nature; that is, they have a physical problem with a psychological cause. 1906 Words 8 Pages. -0.38 B. %%EOF What area is given by a cumulative proportion? What does a z-score tell us? Each correct answer is worth 2 marks. You will see approximately four to six items on each screen. Specifically, he wants to estimate the difference in score performance betw... 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