This quiz works best with JavaScript enabled. Home > Economics > Agricultural Economics > Agricultural Statistics And Economics > Agricultural Statistics And Economics – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Agricultural Statistics And Economics Quiz 5 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A famous medical experiment was conducted by the Nobel Laureate Linus Pauling who believed that vitamin C prevents colds. His subjects were 279 French skiers who were randomly assigned to receive vitamin C or a placebo. Of the 139 given vitamin C, 17 got a cold. Of the 140 given the placebo, 31 got a cold. Find and interpret a 95% confidence interval for the difference of two proportions. A) 1-sample t-interval(mean difference). B) 1-proportion z-interval. C) 2-sample t-interval (difference in means). D) 2-proportion z-interval. Show Answer Correct Answer: D) 2-proportion z-interval. 2. Which type of sample does a researcher deliberately set the proportions of levels of members chosen within a sample? A) Random sample. B) Stratified sample. C) Quota sample. D) Convenience sample. Show Answer Correct Answer: B) Stratified sample. 3. Which of the following are true statements? I. Correlation requires that there are clearly-identified explanatory and response variables.II. Scatterplots require that both variables be quantitative.III. Every least-squares regression line passes through $ \left(\overline{x}, \ \overline{y}\right)$ A) I and II. B) I and III. C) I, II, and III. D) III. E) II and III. Show Answer Correct Answer: E) II and III. 4. The 99% confidence interval for a proportion is (0.54, 0.72). What is the point estimate? A) P-hat=0.63. B) Pi=0.18. C) P-hat=0.09. D) Pi=0.63. Show Answer Correct Answer: A) P-hat=0.63. 5. Census is A) The method of planning, organising and publishing data. B) The method in which no data is collected. C) The method in which data is collected from each and every unit. D) The method in which few units out of the entire population are chosen. Show Answer Correct Answer: C) The method in which data is collected from each and every unit. 6. When we test np and n(1-p) to ensure they are both greater than or equal to 10, what are we trying to determine? A) The standard deviation. B) The test statistic. C) If any bias is present. D) If the data is normal. Show Answer Correct Answer: D) If the data is normal. 7. When p-value is greater than alpha we: A) Accept Ho. B) Accept Ha. C) Fail to reject Ho. D) Reject Ho. Show Answer Correct Answer: C) Fail to reject Ho. 8. If 5 is added to every value in a data set, how does this affect the measure of center? A) Increases by 5. B) Decreases by 5. C) Stay the same. D) 5 times as large. Show Answer Correct Answer: A) Increases by 5. 9. Which of the following statement is incorrect? A) Resources have alternative uses. B) Macroeconomics studies large aggregates. C) All numbers are statistics. D) Statistics studies only the aggregate of quantitative facts. Show Answer Correct Answer: C) All numbers are statistics. 10. What type of sampling? Twenty-five students are randomly selected from each grade level at a high school and surveyed about their study habits. A) Simple Random sample. B) Convenience sample. C) Stratified Random sample. D) Cluster Sample. Show Answer Correct Answer: C) Stratified Random sample. 11. The correlation between the heights of fathers and the heights of their (fully grown) sons isr = 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 measuredin furlongs (one furlong equals 7920 inches), the correlation between heights of fathers andheights 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. 12. What is the critical value z* for a 99% confidence interval? A) -2.58. B) 1.96. C) -1.64. D) 2.58. Show Answer Correct Answer: D) 2.58. 13. A 90% confidence interval for the mean speed driven by cars on East Main St. is given by (21, 45). What was the sample mean of this study? A) 12. B) 24. C) 33. D) None of these. Show Answer Correct Answer: C) 33. 14. A TV show host asks his viewers to visit his website and respond to an online poll.What type of sample is this? A) Simple random sampling. B) Stratified random sampling. C) Cluster random sampling. D) None of the above. Show Answer Correct Answer: D) None of the above. 15. Which of the following sources of error is included in the margin of error A) Chance variation in choosing a random sample. B) Undercoverage. C) Some of the subjects did not understand the questions. D) Voluntary response. Show Answer Correct Answer: A) Chance variation in choosing a random sample. 16. Which of the following is an open ended question? A) Which of the following is the most convenient way of transportation?. B) Why do you like to travel alot?. C) Can you see the man standing over there?. D) What is your favorite color?. Show Answer Correct Answer: B) Why do you like to travel alot?. 17. At a local community College, five math classes are randomly selected out of 20 and all of the students from each class are interviewed. A) Simple random sampling. B) Stratified random sampling. C) Cluster sampling. D) Systematic sampling. Show Answer Correct Answer: C) Cluster sampling. 18. If the p-value > $ \alpha$, then the sample is not unusual if the null is true, so we ..... the null, so there is not convincing evidence that the alternative hypothesis is true, so the results are ..... A) Fail to reject, not statistically significant. B) Fail to reject, statistically significant. C) Reject, not statistically significant. D) Reject, statistically significant. Show Answer Correct Answer: A) Fail to reject, not statistically significant. 19. What does the square of the correlation (r2) measure? A) How close the points cluster around a linear pattern. B) The relationship between the explanatory and response variable. C) The percent of variation of the y variable as explained by the LSRL. D) The residual affect from the LSRL as compared to it's correlation. Show Answer Correct Answer: C) The percent of variation of the y variable as explained by the LSRL. 20. It is a variable that can assume any numerical value over an interval or intervals. A) Discrete variable. B) Continuous variable. C) Quantitative variables. D) Variable. E) Qualitative variables. Show Answer Correct Answer: B) Continuous variable. ← 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 6Agricultural Statistics And Economics Quiz 7Agricultural Statistics And Economics Quiz 8Agricultural Statistics And Economics Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books