Consider a Situation in Which Chris Predicts That an Impending

question 33

Multiple Choice

Consider a situation in which Chris predicts that an impending drainage connection will alter the number of fish in a set of six small lakes. She uses a large net (a seine) and counts the number of fish and obtains the values shown. What is the 95% confidence interval for the difference in the values?
?
Number of fish caught in six seines before and after drainage connection.

$\begin{array}{lll}\underline {\text {Vial } }&\underline {\text { Before } }&\underline {\text { After } }\\1 & 24 & 20 \\2 & 35 & 31 \\3 & 64 & 59 \\4 & 51 & 52 \\5 & 25 & 22 \\6 & 48 & 39\end{array}$

• A) -8.9 < ? < 0.9
• B) -7.9 < ? < -0.1
• C) -7.4 < ? < -0.6
• D) -5.9 < ? < -2.1

---

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.