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Agricultural Statistics And Economics Quiz 8 (20 MCQs)

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1. 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).Joseph is 22.5 months old. What is his predicted height?
2. A sample of 30 women finds the mean height to be 62.3 in and the standard deviation to be 1.5 in. Find the margin of error of women's heights for a 95% confidence interval.
3. Which of the following is NOT part of the sampling design process?
4. The standard IQ test has a mean of 96 and a standard deviation of 14. We want to be 99% certain that we are within 4 IQ points of the true mean. Determine the required sample size.
5. Wilt and Bill, two basketball players, are having a free throw shooting contest. Wilt is known to make 75% of his free throws, and Bill is known to hit 85% of his free throws. Each of them takes 50 shots. Assuming that the shots are independent, what is the probability that Bill hits a higher percentage of his shots that Wilt?
6. What can you do to reduce the margin of error?
7. A researcher at a major hospital wishes to estimate the proportion of the adult population of the U.S. that has high blood pressure. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 5%?
8. Which z-value is used for a 95% confidence interval?
9. Mrs. Trahan samples her class by selecting every third person on her class list. Which type of sampling method is this?
10. Identify whether the information described is a parameter or statistic. 4. There are 547 students in the school. All these students took and passed the test with average score of 156/ 170.
11. Matthew is gathering data for his study. Matthew tells his research assistants to be sure to interview twenty 6th graders, twenty 7th graders, and twenty-five 8th graders. Which of the following methods of sampling is Matthew most likely using?
12. How can you reduce both Type I and Type II errors?
13. A method where the researcher sees the situation directly
14. A study was done on the relationship between high school grade point average (GPA) and scores on the SAT. The following 8 scores were from a random sample of students taking the exam:x(GPA) 3.2 3.7 3.9 3.1 3.6 2.5 2.9 3.5 y(SAT) 725 743 745 665 700 562 590 740What is the percent of variation in SAT scores is accounted for by the LSRL?
15. Identify whether the information described is a parameter or statistic. Sixty-two of the 97 passengers aboard the Hindenburg airship survived its explosion.
16. In a study of 150 accidents that required treatment in an emergency room, 36% involved children under 6 years of age. Find the 90% confidence interval of the true proportion of accidents that involve children under the age of 6.
17. Divide the class into four groups (freshman, sophomore, junior and senior) and take a random sample of two students from each group
18. A nurse at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 95% confident that the true mean is within 3 ounces of the sample mean? The standard deviation of the birth weights is known to be 6 ounces.
19. A survey of 800 women shoppers found that 136 of them shop on impulse. What is the 98% confidence interval for the true proportion of women shoppers who shop on impulse?
20. Concerns how spread out the values are.
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