TABLE 14-15
The superintendent of a school district wanted to predict the percentage of students passing a sixth-grade proficiency test.She obtained the data on percentage of students passing the proficiency test (% Passing) ,mean teacher salary in thousands of dollars (Salaries) ,and instructional spending per pupil in thousands of dollars (Spending) of 47 schools in the state.
Following is the multiple regression output with Y = % Passing as the dependent variable,X1 = Salaries and X2 = Spending: 
-Referring to Table 14-15,which of the following is the correct null hypothesis to test whether mean teacher salary has any effect on percentage of students passing the proficiency test,taking into account the effect of instructional spending per pupil?
Definitions:
Allele Frequencies
The relative frequencies of different alleles of a particular gene in a given population.
Genotype Frequencies
The distribution of the different genetic constitutions within a population.
Fixing Beneficial Allele
The process by which a favorable genetic variant becomes present in all individuals within a population due to natural selection.
Population Size
The total number of individuals within a defined area at a specific time.
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