Question 1
The sampling distribution of the test statistic for a goodness-of-fit test withkcategories is:
◦
approximately a chi-square distribution withk – 1 degrees of freedom.
◦
approximately a chi-square distribution withkdegrees of freedom.
◦
a chi-square distribution withk – 1 degrees of freedom.
◦
a Student’stdistribution withk – 1 degrees of freedom.
Question 2
The target grade distribution for a particular course is 10% A, 30% B, 40% C, 15% D, 5% F. Students complain that a particular professor who teaches this course grades “too hard.” The present students survey 250 former students of this professor’s class and then do aχ2 goodness-of-fit test to see if the data provide sufficient evidence to support their complaint. They find a critical value of 14.7 and a test statistic of 9.8, withα= 0.10. What is the take-away conclusion from this survey?
◦
The professor’s grades do not conform to the target.
◦
The professor’s grades conform to the target.
◦
There is not sufficient statistical evidence to reject the idea that the professor’s grades conform to the target.
◦
There is sufficient statistical evidence to reject the idea that the professor’s grades conform to the target.
Variation in climatic conditions result in geographic variation in the distribution of biome types a
College Students, By Sex and Race-Ethnicity
Distribution and Forms of Precipitation: Snow
Distribution and Forms of Precipitation: Snow
Distribution Patterns and Population Size Estimates (Bio 30)
Distribution Patterns and Population Size Estimates (Bio 30)