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Chapter 12: Q. 12.3 (page 484)
Consider two curves with degrees of freedom and respectively. which one more closely resembles a normal curve? Explain your answer.
A degrees of freedom of -curve is more closely resembles a normal curve than adegrees of freedom of -curve.
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For a curve with degrees of freedom, determine the value that has area
a. to its right.
b. to its right.
In each of the given Exercises, we have given the number of possible values for two variables of a population. For each exercise, determine the maximum number of expected frequencies that can be less than 5 in order that Assumption 2 of Procedure 12.2 on page 506 to be satisfied. Note: The number of cells for a contingency table with m rows and n columns is m鈰卬.
12.73 two and two
Studies have shown that a positive association exists between educational level and annual salary; in other words, people with more education tend to make more money.
a. Does this finding mean that more education causes a person to make more money? Explain your answer.
b. Do you think there is a casual relationship between educational level and annual salary? Explain your answer.
What are the small boxes inside the heavy lines of a contingency table called ?
In each of the given Exercises, we have given the number of possible values for two variables of a population. For each exercise, determine the maximum number of expected frequencies that can be less than 5 in order that Assumption 2 of Procedure 12.2 on page 506 to be satisfied. Note: The number of cells for a contingency table with m rows and n columns is m鈰卬.
12.70 five and three
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