Find the probability that the number who cons... 61% of men consider themselves professional baseball fans. If the level of significance is .05 and the p-value is .000672, should the null hypothesis be rejected or should we fail to reject the null hypothesis? Summarize how to use hypothesis tests on the population mean (\mu). Draw a vertical line through a normal distribution for z a z-score equal to 1.60. A sample mean of $75.44 and a standard deviation of $17.20 are subsequently computed. -0.44 C. 1.00 D. -1.50 E. None of the above, Consider the Standard Normal distribution. -0.02 b. Which is the following is correct? 3 C. 1 D. 0. What proportion of a normal distribution is located between the following z-score boundaries: z = - 0.90 and z = 0.90. Do male and female consumers differ in the amounts they spend? 150 b. Find the z-score location of a vertical line that separates a normal distribution as described: 75% in the body on the left. Find P(1.21 less than Z less than 3.00). One typical IQ scale has a mean of 100 and standard deviation 15... For a Normal distribution, the chance of the variable z equaling exactly 1.5 is [{Blank}]. The gas mileage for a certain model of car is known to have a standard deviation of 4 mi/gallon. The population standard deviation is unknown. If you have a preliminary estimate of 62% for p.... A sociologist wishes to determine the mean age at which students graduate. What is the mean value of X? The following sample of 16 measurements was selected from a population that is approximately normally distributed. If there is a relationship between "amount of coffee consumed" and "nervousness", then as the amount of coffee consumed increases, the amount of nervousness [{Blank}]. What is negative correlation in statistics? True b. a. You may assume that the outcome of any one t... At the Morehouse General Hospital approximately 25% of all births are by caesarian section. A. Accepted characters : numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). The proprietor of Midland Construction Company has to decide between two projects. MATH 1280 Introduction to Statistics – Final Exam 9 ** WARNING No Answers Provided Below ** Information Information text There are 20 questions on this exam. 3 B. 95% of data would be expected to fall within 2s of the line, and 2s= ?) ��(�@������;��43_2�����+!�e w�O� Suppose we believe that the use of illegal drugs is a public bad - that is, that one person's drug use imposes a negative externality on the rest of society. 175,600 c. 3,840,500 d. 2,947,000. All cell phones, PDAs, iPods, laptops, etc, should be turned off and put out of sight. Which one is better? The sample mean for a recent introductory psychology test was 78 and the sample variance was 9. 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 One interpretation of the slope is a. a student who scored 0 on the midterm would be predicted to score 50 on the final exam. 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 probability of getting a sample mean between 500 and 520 if the population mean is 500 and the standard deviation of the sampling distribution (the standard error of the mean) is 20? A. Poisson distribution B. Exponential distribution C. Binomial distribution D. Normal distribution... What symbol represents the density curve (population) standard deviation? Which of the following correlation coefficients indicates the strongest relationship between two variables? Fall 2016. Find the probability that B happens. The final exam covers all topics we have learned in class. Let p be the proportion of calls to business people for which the caller reaches the person being called on the first try. 2.07 C. 1.96 D. 2.15 E. None of the above, Consider the Standard Normal curve. Imagine you are in a game show. (c) It is changed from a 95% CI to a 90% CI. In terms of skewness, the normal bell-shaped curve is [{Blank}]. A researcher obtains a sample mean of 66, which produces a z of +1.45. (b) A larger t or z value is used. normality and use 90% confidence level. 369 0 obj <>/Filter/FlateDecode/ID[<7311042127E25246BD3DE08EDE43CB86>]/Index[340 56]/Info 339 0 R/Length 130/Prev 254460/Root 341 0 R/Size 396/Type/XRef/W[1 3 1]>>stream What error does the margin of error in a confidence interval cover? C. Subtracting the standard deviation from each value. Identify the exam score that should lead to the better grade: a score of X = 40, on an exam with = 45 and = 2, or a score of X = 60, on an exam with = 70 and = 20. If the professor selects from the class list using random sampling. Determine whether the body is on the right or left side of the line and find the proportion in the body. a. It is more difficult to reject a null hypothesis if we use a 10% level of significance compared with a 5% level of significance. What is the mean value of X? V5A 1S6 Canada Office: K10565 . 95% confidence; n = 2388, x = 1672. 250 c. 450 d. 750 e. What... A survey shows that in one town, 32% of residents jog, 35% bike, and 12% do both activities. What is the standard deviation of the Standard Normal distribution? Construct a 95% confidence interval for the population proportion of women who change their nail polish once a week. A. Identify the exam score that should lead to the better grade: a score of X = 62, on an exam with = 50 and = 8, or a score of X = 23, on an exam with = 20 and = 2. If your work is absent or illegible, and at the same time your answer is not perfectly correct, then no partial credit can be awarded. Twenty eight pigs were given 2 oz of alcohol and then tested. Express her exam result as a z-score, and interpret its meaning. %PDF-1.5 %���� A national computer retailer believes that the average sales are greater for salesperson with a... For the given below, state the type of hypothesis test to be used for X^2 Goodness of Fit Test. = s (0 2 4 3) + (1 )2 + (3 4)2 2 = 1 3 r Determine whether the events of getting tails twice are independent or dependent. A) Binomial distribution B) Poisson distribution C) T-distribution, Which of the following distributions are symmetric? Linear regression analysis is statistics final exam questions and answers most widely used of all statistical techniques: it is the study statustics linear, additive relationships between variables. Fall 2016. Given the date below, find the equation of the regression line. 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? If you see the notation (E X)(E Y) what should you do? A. In a statistics course, a linear regression equation was computed to predict the final-exam score from the score on the first test. agus99. Draw a vertical line through a normal distribution for z a z-score equal to - 0.70. Using these data, test the claim that the mean score for the population of all statistics final exams is μ=79 against the alternative hypothesis that the mean score is … Each correct answer is worth 2 marks. Sample Statistics Exam #500 Answer Section MULTIPLE CHOICE 1. A sample has a mean of M = 40 and a standard deviation of s = 6. When would you use the t-distribution procedure to find the confidence interval for the population … Assuming normality, compute 90% confidence level for true proportions of failed students. The probability that on a given day any one copier will break down is 11/100. b) Decrease number in sample. The tallest person ever confirmed by the Guinness records organization was Robert Ludlow of the United States, at 8 feet 11.1 inches tall. A student who scored 0 on the midterm would be predicted to score 50 on the final exam. Find the probability that in 12 randomly selected young college graduates, 2 will be unemployed. Given the date below, find the slope and interpret. Consult the Useful Formulas sheet as needed. f(x) = \sqrt[3]{1 + 2x}. If you make ten different 90% confidence intervals. Read all the instructions carefully. (d) Both (b) and (c). Find E[Y /X =1/4]. A. Z c. Morphet's Q d. F e. Chi. The distinguishing characteristic of a rectangular distribution is that [{Blank}]. When plotting correlational data, the appropriate graph to use is the [{Blank}]. A deviation score of -3 indicates that the raw score is [{Blank}]. 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. Many hotel chains that offer free wifi service to their customers have experianced increasing demand for internet bandwidth and increasing costs. If there were 500 students in Jamal's class, approximately how many actual students scored higher than Jamal on the quiz if Jamal had a z-score of -1? 3.1: Terminology. Round your answer to one decimal place. A. Assume that you make random guesses for 5 true-or-false questions. Then identify the indicated probability. Which of the following is the difference between the population regression equation and the estimated regression equation? False, If a covariance is positive, then the corresponding correlation is necessarily positive. B. Marriott international would like to test the hypo... National safety statistics suggest that about 33% of the persons treated in an emergency room because of moped accidents are under 16 years of age. Essay on Statistics Final Exam Answers. 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. They occur with a... What do we call that portion of the sampling distribution in which values are considered too unlikely to have occurred by chance? Given the date below, compute the coefficient of determination, R square, and interpret. Which of the following is false? The probability that you will throw boxcars (two 6's) with one throw using 2 dice is: A. Consider the following observations from a population: 88 235 73 138 138 71 229 153 73 a. Find the 99% confidence interval of the true proportion of people who did not have cell phones. a. The car wash takes exactly 4 minutes (this is constant). The scores on a certain test are normally distributed with mean 61 and standard deviation 3. If you make just one 90% confidence interval will it necessarily capture the population value you are estimating? What is the probability of getting exactly 2 heads? Use the following contingency table below. In a statistics course, a linear regression equation was computed to predict the final-exam score from the score on the first test. Find the value of z such that the area to the right of z is 67% of the total area. a) +0.65 b) -0.89 c) +0.10 d) -0.10. A. Math 17 Final Exam - Wagaman - … At an automatic car wash, cars arrive randomly at a rate of 7 cars every 30 minutes. What is the population mean? A. The following are hypothetical scores made by students on a multiple choice examination: 87 76 73 70 67 66 64 63 61 60 85 75 72 69 67 65 64 62 61 60 82 74 71 69 answesr 65 63 62 61 60 78 74 71 68 66 65 63 62 61 60 77 74 70 statistics final exam questions and answers 66 64 63 62 61 60 60 59 58 57 56 54 52 50 46 43 60 59 58 57 55 54 52 49 finzl 42 60 59 58 57 55 53 51 49 46 38 60 59 58 56 55 Sttaistics … h�b```���l�B ce`a�8��ذ���A w�ĔSU^� ��Y�~5ǹO�֞�Y�uL����̕�GJ�IlY^�B��~����6�'p��U~��Q5�]:�,F��L ��A��h�� �Y - ��`�PF�(��L�L��3�0e�Δ�dˤʔ����ɤ�p�����܄���-�m�'��M{X1�e� a. Assume. What are the advantages of simple random sampling? What is the slope of the regression equation: Y' = 0.56X + 2.41? Fall 2015. Let Z be a standard normal variable. ): The population size is 500. 0 50 falls outside the confidence... Students conducted a survey and found out that 36% of their peers on campus had tattoos, but only 4% of their peers were smokers. Spring 2017. Overview and Introduction: A brief introduction to statistics and how to write with them. A random sample of 35 specialists is drawn from this population. Find the standard deviation for the 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? (Please show work) a. Use a 0.05 significance level to test the claim of the highway engineer that the standard deviation of speeds is 5.0 mi/h. (a) alpha = 0.025 and df = 4. C = 0.90, s=0.2, x = 2.0, and n = 55. a. Determine the logarithmic trend equation. The sample mean was 77 and the sample standard deviation was s = 5.6. If you purchase the equity, in one year you will receive $1.5 million with 40% probability and $1.2 million with 60% probability. You plan to record details of the next 100 births at that hospital. 1. On average, an observation with an X value 1 higher than anot... How hard is it to reach a business person by phone? Define the predictor variable or explanatory variable. A. Plug the x-value into the formula for the curve to find the proportion. Select the... Ho: u = 50. 7. Of the three kinds of variances, which use(s) N-1 in the final division? A. The following table shows the frequency of each rating as well as the gender of the customer. In the Marine Corps Marathon, the fastest time for runners of a certain age can be modeled using the equation y = 0.072x^2 - 4.9x + 238 where x is the age and y is the number of minutes taken. We are 90% sure that the population mean is less than 200. The equation as ˆ y = 12 + 0.85 x where y is the final-exam score an … read more x = 540, n = 1200, 90% confidence (Round to the nearest thousandth as needed.). 1. 0.4951 B. Explain in detail the predictor variable or explanatory variable. A survey randomly selected 240 top executives. Which of the following statements is true about outliers in linear regression? 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