In a normal approximation to the Wilcoxon signed rank test, the test statistic is calculated as z = 1.26. For a two-tail test, the p-value is:
A) 0.2076
B) 0.3962
C) 0.1238
D) 0.3974
Q. 2If either event A or event B must occur, they are called mutually exclusive.
Indicate whether the statement is true or false
Q. 3What conclusions can you draw about the relationship between ice cream sales and daily temperature?
What will be an ideal response?
Q. 4The multiple coefficient of determination for a multiple regression model with two explanatory variables X1 and X2:
A) measures the variation around the predicted regression equation.
B) measures the proportion of variation in Y that is explained by X1 and X2.
C) measures the proportion of variation in Y that is explained by X1 holding X2 constant.
D) has the same sign as b1.
Q. 5Use Excel or Minitab to conduct a two-sample t-test for data in the table above.
What will be an ideal response?
Q. 6Of those in the sample who did well in the final exam, what percentage of them spent the weekend before the exam studying?
What will be an ideal response?
Q. 7The binomial and the hypergeometric probability distributions are examples of discrete probability distributions.
Indicate whether the statement is true or false
Q. 8What is the upper confidence limit of the 99 confidence interval for the difference between the two population proportions?
A) 0.249
B) 0.222
C) 0.265
D) 0.278
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