1. Calculate the mean, standard deviation, and standard error of the mean for the following data which represent average number of paid vacation days given in a year to employees from 12 different countries.

Country .................................. Days
Italy .......................................... 42
France  ..................................... 37
Germany .................................. 35
Austria ...................................... 35
Brazil ........................................ 34
Australia ................................... 28
United Kingdom ...................... 28
Canada ..................................... 26
Korea ........................................ 25
Japan ........................................ 25
Belgium .................................... 20
United States ........................... 13

2. Use the data in problem 1 to test the hypothesis that the population mean number of vacation days in the industrialized countries of the world is equal to 25. Set alpha equal to .05 for a two-tailed test.

a. Using symbols, present the null hypothesis.

b. Using symbols, present the alternative hypothesis.

c. Calculate df.

d. Use Table B to find the critical t values.

e. Calculate observed t.

f. Present the statistical decision.

g. Present a summary statement in the context of the research situation.