Cuestionario repaso tema 3

What does a contingency table represent?

• a)      The relationship between quantitative variables.

• a)      The frequency of joint occurrence of two or more qualitative variables.

• a)      The comparison of means between two groups.

• a)      Calculating the probability of an event.

Which of the following statistics is used to measure the association between two qualitative variables?

• a)      Arithmetic mean.

• a)      Standard deviation.

• a)      Chi-squared.

• a)      Pearson correlation coefficient.

1A contingency table with observed data is presented below. Calculate the upper limit of the contingency C and the degree of association given the value of C = 0.6. (See table). What is the degree of association between repeat visits and tourists' intention to return?

• 0.6

• 0.75

• 0.85

• 1.0

What does a very high chi-square (χ²) value indicate in a contingency table?

• a)      That there is no relationship between the variables.

• a)      That the variables are independent.

• That there is an association between the variables.

• a)      That the expected frequencies are very small.

Calculate the chi-square (χ2) statistic for the following contingency table. (Table 7). What is the value of χ2?

• 5.95

• 4.76

• 6.51

• 3.82

What is the contingency C value for the table in the previous question?

• 0.32

• 1.16

• 0.21

• 0.82

How is a χ² value equal to 0 interpreted in an association test?

• a)      There is not enough information to answer.

• a)      There is a significant relationship between the variables.

• a)      The variables are independent.

• a)      The relationship between the variables is weak.

Is the degree of association positive or negative? (Table 11)

• Positive high

• Positive low

• No association

• Negative high

• Negative low