This quiz works best with JavaScript enabled. Home > Economics > Agricultural Economics > Agricultural Statistics And Economics > Agricultural Statistics And Economics – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Agricultural Statistics And Economics Quiz 10 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A random sample of 40 students has a test score with mean = 81.5. Assume the population standard deviation is 10.2. Construct the confidence interval for the population mean, mu, if c = 0.90. A) (78.8, 84.2). B) (66.3, 89.1). C) (51, 8, 92.3). D) (71.8, 93.5). Show Answer Correct Answer: A) (78.8, 84.2). 2. A research group wishes to estimate the mean amount of time (in hours) that members of a fitness center spend exercising each week. They want to estimate the mean within a margin of error of 0.5 hours with a 95% level of confidence. Previous data suggests that the standard deviation is 2.2. Which of the following is the smallest sample size they could use? A) 60. B) 75. C) 90. D) 180. Show Answer Correct Answer: B) 75. 3. The mean monthly rent for one bedroom apartments in college towns around Michigan is $ 900. A future student group thinks that the rent is actually higher than the claim. To help them budget, the students determine the mean monthly rent of 200 different one bedroom apartments from around Michigan. State the null and alternative hypothesis for this test. A) $ H_o:\ \mu=900, \ H_a:\ \mu<900$. B) $ H_o:\ p=900, \ H_a:\ p<900$. C) $ H_o:\ \mu=900, \ H_a:\ \mu>900$. D) $ H_o:\ p=900, \ H_a:\ p>900$. Show Answer Correct Answer: C) $ H_o:\ \mu=900, \ H_a:\ \mu>900$. 4. Intelligent tests, aptitudes, personality traits, and attitudes, creation of scales and measuring instruments A) Social Science. B) Research & Statistics. C) Psychology. D) Biology. E) Health. Show Answer Correct Answer: C) Psychology. 5. At a local high school, GPA's are normally distributed with a mean of 2.9 and standard deviation of 0.6. What percentage of students at the high school have a GPA between 2.3 and 3.5? A) 68%. B) 99.7%. C) 95%. D) 84%. Show Answer Correct Answer: A) 68%. 6. The correlation between the heights of fathers and the heights of their (fully grown) sons is r = 0.52. This value was based on both variables being measured in inches. If fathers' heights were measured in feet (one foot equals 12 inches), and sons' heights were measured in furlongs (one furlong equals 7920 inches), the correlation between heights of fathers and heights of sons would be A) Much smaller than 0.52. B) Slightly smaller than 0.52. C) Unchanged:equal to 0.52. D) Slightly larger than 0.52. E) Much larger than 0.52. Show Answer Correct Answer: C) Unchanged:equal to 0.52. 7. Which z-star value is used to construct a 95% confidence interval? A) 1.65. B) 1.96. C) 2.58. D) 2.33. Show Answer Correct Answer: B) 1.96. 8. Which of the following best describes a Type I error? A) The null is true, but we mistakenly reject it. B) The null is false and we reject it. C) The null is false, but we fail to reject it. D) The null is true but we fail to reject it. E) The null is true, and we fail to reject it. Show Answer Correct Answer: A) The null is true, but we mistakenly reject it. 9. Identify whether the information described is a parameter or statistic. 2. The average height of 30 mango tree samples is 100 feet with a canopy of approximate 35 feet. A) Parameter. B) Statistic. C) Cannot be determined. D) Needs more information. Show Answer Correct Answer: B) Statistic. 10. A car rental agency has two locations, one by the airport and the other downtown. The agency rents 70% of its cars at the airport and the rest downtown. At the airport, 20% of the rentals are Sport Utility Vehicles (SUVs). At the downtown location, 40% are SUVs. If a customer is selected at random, what is the probability that she did NOT rent an SUV? A) 0.74. B) 0.70. C) 0.66. D) 0.40. E) 0.26. Show Answer Correct Answer: A) 0.74. 11. Only one of the following statements is plausible. Which one? A) There is a high correlation between the gender of American workers and their income. B) We found a high correlation (r = 1.09) between students' ratings of faculty teaching and ratings made by other faculty members. C) The correlation between planting rate and yield of corn was found to be r = 0.23 bushels. D) We found the correlation between Verbal SAT and Math SAT scores to be r = 0.88. Show Answer Correct Answer: D) We found the correlation between Verbal SAT and Math SAT scores to be r = 0.88. 12. Which confidence level corresponds to a critical value of 1.64? A) 90%. B) 95%. C) 99%. D) None of above. Show Answer Correct Answer: A) 90%. 13. A support hotline asks callers to stay on the line after they have completed their call to respond to a short survey.What type of sample is this? A) Simple random sampling. B) Systematic random sampling. C) Stratified random sampling. D) None of the above. Show Answer Correct Answer: D) None of the above. 14. The correlation coefficient is represented by what? A) $r$. B) $r^2$. C) $s$. D) $c$. Show Answer Correct Answer: A) $r$. 15. Which of the following are resistant to outliers? A) The mean and standard deviation. B) The median and standard deviation. C) The median and the range. D) The median and IQR. E) The range and IQR. Show Answer Correct Answer: D) The median and IQR. 16. A 90% confidence interval for a population mean is determined to be 800 to 900. If the confidence level is increased to 95% confidence and the sample statistics and sample size remain the same, the confidence interval A) Becomes wider. B) Becomes narrower. C) Does not change. D) None of above. Show Answer Correct Answer: A) Becomes wider. 17. An enquiry in which each unit of the universe is studied is called ..... A) Sample. B) Population. C) Incomplete enumeration. D) Complete enumeration. Show Answer Correct Answer: D) Complete enumeration. 18. For children between the ages of 18 months and 29 months, there is an approximately linearrelationship between height and age. The relationship can be represented by y-hat= 64.93 + 0.63x, where y represents height (in centimeters) and x represents age (in months).Loretta is 20 months old and is 80 centimeters tall. What is her residual? A) -2.47. B) 2.47. C) -12.60. D) 12.60. E) 77.53. Show Answer Correct Answer: B) 2.47. 19. An inspector monitors large truckloads of potatoes to determine the true proportion, pi, of potatoes with major defects. She selects a simple random sample of 50 potatoes from a truckload of more than 2000 potatoes. Suppose that only 2 of the 50 potatoes sampled are found to have major defects. Which one of the following assumptions for inference about a proportion using a confidence interval is violated? A) N(p-hat) >= 10. B) N(1-p-hat) >= 10. C) 10n <= N. D) There are not violations. Show Answer Correct Answer: A) N(p-hat) >= 10. 20. Which of the following is the definition of a "point estimate? " A) The average of a population. B) The average of a sample. C) The midpoint of a confidence interval. D) The confidence interval. Show Answer Correct Answer: C) The midpoint of a confidence interval. ← PreviousNext →Related QuizzesAgricultural Economics QuizzesEconomics QuizzesAgricultural Statistics And Economics Quiz 1Agricultural Statistics And Economics Quiz 2Agricultural Statistics And Economics Quiz 3Agricultural Statistics And Economics Quiz 4Agricultural Statistics And Economics Quiz 5Agricultural Statistics And Economics Quiz 6Agricultural Statistics And Economics Quiz 7Agricultural Statistics And Economics Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books