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Agricultural Statistics And Economics Quiz 3 (20 MCQs)

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1. The null hypothesis always contains a:
2. Statistics is applied in-
3. The 90% interval for a statistics test was given by 72 +-7. What is the lower value for the interval?
4. An agricultural company wanted to know if a new insecticide would increase corn yields. Eight test plots showed an average increase of 3.125 bushels per acre. The standard deviation of the increases was 2.911 bushels per acre. Determine a 99% confidence interval for the mean increase in yield.
5. Identify whether the information described is a parameter or statistic. In a recent year, the interest category for 12% of all new magazines was sports.
6. A business evaluates a proposed venture as follows. It stands to make a profit of $ 10, 000 with probability 3/20, to make a profit of $ 5000 with probability 9/20, to break even with probability 5/20, and to lose $ 5000 with probability 3/20. The expected profit in dollars is
7. Scatterplots require that both variables be quantitative.
8. The correlation coefficient measures
9. Slab avalanches studied in Canada have an average thickness of $\mu$ = 67 cm. The ski patrol at Vail Colorado, is studying slab avalanches in their region. A random sample of 16 avalanches showed that x-bar = 61.8cm and s = 10.6 cm. Assuming the slab thickness is normally distributed, test the claim that the mean slab thickness is the Vail region is different from that in Canada with a level of significance of 1%.
10. Using the information below, identify which of the following is NOT an outlier:Q1 = 53Q2 = 55Q3=61
11. Correlation and regression requires an explanatory and response variable.
12. Part of the survey that gives the respondent the SURVEY TOPIC (or what the survey is all about) and what to do with the survey.
13. At right is a cumulative relative frequency graph for the 48 racers who finished the grueling 50km cross-country ski race at the 2014 Sochi Olympics. Approximately what proportion of the racers finished the race in MORE than 2.15 hours?
14. If a number is added to a set that is far away from the mean, how does this affect standard deviation?
15. In a survey of 2480 golfers, 15% said they were left-handed. The survey's margin of error was 3%. Construct a confidence interval for the proportion of left-handed golfers.
16. Which is NOT an example of categorical data?
17. For the set of data below, which statement is correct.55, 60, 76, 88, 92, 111, 120
18. Which is the strongest correlation?
19. Complete the equation:point estimate +/ .....
20. Select three students from a class to receive ice cream by putting all the students' names in a hat and picking out three names randomly.
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