(I a Frequency Distribution Is Grouping of Data into Classes

question 18

Multiple Choice

(i. A frequency distribution is grouping of data into classes showing the number of observations in each class. (ii) The midpoint of a class, which is also called a class mark, is halfway between the lower and upper limits.
(iii) A class interval, which is the width of a class, can be determined by subtracting the lower limit of a class from the lower limit of the next higher class.

• A) (i), (ii) and (iii) are all correct statements.
• B) (i) and, (ii) are correct statements but not (iii).
• C) (i) and, (iii) are correct statements but not (ii).
• D) (ii) and, (iii) are correct statements but not (i).

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Definitions:

Kruskal-Wallis Test

A nonparametric method for testing whether samples originate from the same distribution, used when the assumption of normality in ANOVA is violated.

P-value

The probability of observing test results at least as extreme as the results actually observed, under the assumption that the null hypothesis is true.

Test Statistic

A value calculated from sample data during a hypothesis test to decide whether to reject the null hypothesis.

Kruskal-Wallis Test

A nonparametric method for testing whether samples originate from the same distribution, used for comparing more than two groups.