Suppose an Agronomist Used Four Test Plots to Determine the Relationship

question 2

Multiple Choice

Suppose an agronomist used four test plots to determine the relationship between the wheat yield y (in bushels per acre) and the amount of fertilizer x (in hundreds of pounds per acre) . The results are shown in the table. Determine the least squares regression line for the data using the regression capabilities of a graphing utility, and then use this model to estimate the yield for a fertilizer application of 160 pounds per acre. Round your answer to one decimal place.

• A) 37.3 bushels per acre
• B) 39.7 bushels per acre
• C) 35.6 bushels per acre
• D) 38.4 bushels per acre
• E) 39.3 bushels per acre

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Definitions:

Percentile

A statistical measure indicating the value below which a given percentage of observations in a group of observations falls.

Normal Curve

A bell-shaped curve that represents the distribution of many types of data in which most values cluster around a central mean.

Standard Deviation

A statistic that measures the dispersion or variation from the average in a set of data, indicating how spread out the numbers are.

Test-retest Reliability

The consistency of a psychological test or assessment over time when administered to the same group of people.