Because they can take any value within their domain, and their value for any particular case is not known until the survey is completed. influences how much college students eat. Initially, 26. F Statistics are always greater than or equal to 0. As the degrees of freedom increase in an F distribution, the distribution becomes more nearly normal. Reject the null hypothesis, because α ≥ p. 43. t19. 9. Calculate Cohen’s d and interpret it. Use an alpha level of 0.05. Use the following information to answer the next two exercises: On any given day, approximately 37.5% of the cars parked in the De Anza parking garage are parked crookedly. X has an exponential distribution with decay parameter m and mean and standard deviation 1 m. . 34. c. The test is to determine if the different groups have the same means. You have four groups of 30 calves (one is a control group receiving the usual feed, but no supplement). Then click 'Next Question' to answer the next question. Use the following information to answer the next two exercises. The domain of Z = any amount of money from 0 upwards. With continuous random variables, we never calculate the probability that X has a particular value, but always speak in terms of the probability that X has a value within a particular range. Construct a stem plot for this data, using only the values in the range 0–100. P(A and B) = (P(B\|A))(P(A)) = (0.85)(0.70) = 0.595. 26. Describe how you would draw the continuous probability distribution described by the function f(x)= 1 10, 46. 4563 kb/s. 10. 61. 42. Because you are using the normal approximation to the binomial, z α 2 =1.96, Calculate the error bound for the population (EBP): * * *, Calculate the 95% confidence interval: * * *. Therefore, it is most likely a good model to be used. 6. Susan’s z-score was 2.0, meaning she scored two standard deviations above the class mean for the final exam. You use the t-distribution because you don’t know the population standard deviation, and the degrees of freedom are 24 because df = n – 1. 42. State the appropriate alternative hypothesis to this null hypothesis: H0: p < 0.25. You conduct a study in which you weigh the participants at the start of the study, and again at the conclusion, after they have participated in the exercise program for six months. Because you are drawing without replacement, and 26 of the 52 cards are red, you have to draw a red card within the first 17 draws. The videos are really awesome and they’re great to watch for review! You would draw it as a rectangle with the vertical sides at 0 and 20, and the horizontal sides at 1 10, 46. 9. 38. Use the following information to answer the next two exercises: Suppose that a survey yielded the following data: 6. 68. The conclusion to the test is: 37. 13. r( s y s x )=0.73( 9.6 4.0 )=1.752≈1.75, 14. a= y ¯ −b x ¯ =141.6−1.752(68.4)=21.7632≈21.76, 16. 26. 16. How would you express this information in a linear equation? Suppose you wanted a 95% confidence interval within three percentage points of the population. Chapter 3. Statistics, Final Exam Solutions Page 4/25 . 66. 76. P( x<10 )=( 10 )( 1 30 )= 0.33, 52. The calculator function Tinterval answer is (98.29, 98.51). Statistics Final Exam Study Guide Author: gallery.ctsnet.org-Maik Moeller-2020-11-29-18-41-49 Subject: Statistics Final Exam Study Guide Keywords: statistics,final,exam,study,guide Created Date: … 63. scores will be held for four to six weeks while item analysis and exam performance statistics are generated and reviewed. 32. If you drew samples of this size repeatedly, computing the sum each time, what range of values would you expect to contain 95 percent of the sample sums? 64. 7. If P(A) = 0.3 and P(B) = 0.5, find P(A AND B). Chapter 8/9. An interpretation of the slope is: A. 37. The first is that it was conducted by a group who would benefit by the result—almond sales are likely to increase if people believe that eating almonds will make them happier. A study was done to determine the proportion of teenagers that own a car. What is the probability that a randomly chosen fourth grader takes more than seven minutes to take out the trash? 10. This girl is shorter than average for her age, by 0.89 standard deviations. Using the calculator function 2-PropZTest, the p-value = 0.0417. Explain how lurking variables could offer an alternative explanation for the observed differences in test scores. A student who scored 0 on the midterm would be predicted to score 50 on the final exam. Suppose the sample size in this study had been 50, rather than 30. Height (in inches) and weight (In pounds) in a sample of college freshman men have a linear relationship with the following summary statistics: * * *, Let Y = weight and X = height, and write the regression equation in the form: * * *. 57. You need 601 subjects (rounding upward from 600.25). If you increased the sample size to 100, what range would you expect to contain 68 percent of the sample means, applying the empirical rule? 77. 41. 39. Use an estimated population proportion of 0.5. A sample of the last ten marathon winning times is collected. 8. Do not reject the null hypothesis and conclude that the study produced no evidence that the variables are significantly correlated. The response variable is Final scores (FS) and the explanatory variable is Test3 scores (TS). 33. X = Joe gets a hit in one at-bat (in one occasion of his coming to bat), 27. σ x = npq = 20(0.40)(0.60) =2.19. 54. 6. If you reject H0 when H0 is correct, what type of error is this? The standard deviation of the sampling distribution of the sample means can be calculated using the formula ( σ x n ), , which in this case is ( 16 50 ). No. What is the 95% two-sided confidence interval? The final question on the exam is the Investigative Task question. If X ~ Exp(0.8), then P(x < μ) = \_\_\_\_\_\_\_\_\_\_. There is sufficient evidence to conclude that the choice of major and the gender of the student are not independent of each other. 36. 19. Conduct an appropriate test to determine if the distribution is uniform. Use the following information to answer the next six exercises. You conduct a study, based on a sample drawn from a normally distributed population with a known variance, with the following hypotheses: * * *. , describe the pattern in this survey the interval: H0: =. 0.3 20 ) = ( 1.96 ) ( 0.73 ) = 0.4, 47 books... Bar, and other study tools, inclusive + 75 * * * *. 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