We determine the approximate width of the classes by subtracting the smallest observation from the largest and dividing the answer by the number of ___________________ _.
Fill in the blank(s) with correct word
Question 2
Students in statistics classes were asked whether they preferred a 10-minute break or to get out of class 10 minutes early. In a random sample of 150 students, 40 preferred a 10-minute break, 80 preferred to get out 10 minutes early, and 30 had no preference. We want to determine if there is a difference in students' preferences. The hypothesis is to be tested at the 5 level of significance. The decision rule is not to reject the null hypothesis if _____.
a. 1.96 < z < 1.96
b. 1.645 < z < 1.645
c. z > 1.96 or z < 1.96
d. the number of + signs is greater than or equal to 20 and less than or equal to 130
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