In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer. Is fishing better from a boat or from the shore? Pyramid Lake is located on the Paiute Indian Reservation in Nevada. Presidents, movie stars, and people who just want to catch fish go to Pyramid Lake for really large cutthroat trout. Let row 8 represent hours per fish caught fishing from the shore, and let row A represent hours per fish caught using a boat. The following data are paired by month from October through April. April 3.3 3.8 Oct Nov Dec Jan Feb March B: Shore 1.4 1.4 1.9 1.5 2.1 3.2 3.9 3.6 A: Boat 1.6 2.2 3.3 3.0 Use a 1% level of significance to test if there is a difference in the population mean hours per fish caught using a boat compared with fishing from the shore. (Let d= 8- A.) (a) What is the level of significance? State the null and altemate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? O H: H* 0; H,iHg=0; two-tailed O Ho: H0; H:0; two-tailed O H: H= 0; H,:H< 0; left-tailed O H: = 0; H,: H > 0; right-tailed (b) What sampling distribution will you use? what assumptions are you making? O The standard normal. We assume that d has an approximately uniform distribution. O The standard normal. We assume that d has an approximately normal distribution. O The Student's t. We assume that d has an approximately uniform distribution. O The Student's t We assume that d has an approximately normnal distrinurion

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.