881 Underwater sound-locating ability of alligators. Alligatorshave shown the ability to determine the direction of an air-borne sound. But can they locate underwater sounds? Thiswas the subject of research published in the Journal ofHerpetology (Dec. 2014). Alligators inhabiting the floodcontrol canals in the Florida Everglades were monitored formovement toward a sound produced from a submerged div-ing bell. Movements within a 180° arc of the direction towardthe sound were scored as movements toward the sound; allmovements in other directions were scored as movementsaway from the sound. Consequently, the researchers assumedthat the proportion of movements toward the sound expectedby chance is 180°/360° = .5. In a sample of n = 50 alliga-tors, 42 moved toward the underwater sound.a. Give the null and alternative hypotheses for testingwhether the true proportion of alligators that move to-ward the underwater sound is higher than expected bychance.b. In a sample of n = 50 alligators, assume that 42 movedtoward the underwater sound. Use this information tocompute an estimate of the true proportion of alligatorsthat move toward the underwater sound.c. Compute the test statistic for this study.

The question is based on a hypo. testing of a popl. prop. Given : Assumed prop. of movement toward…

Answered: a. Give the null and alternative…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A reviewer checks to see if a bag of candy weighs less than advertised (e.g., 100 grams). What is the appropriate test statistic for each scenario a. One sample Z-test b. One sample t-test c. two related samples t-test d. two indepdent samples t-test
If you were to draw 15 random samples of 100 residents in a city you may get 15 different mean values simply by chance. These expected differences across samples may be defined as: a. a statistical effect b. sampling error c. random error d. probability
1. Consider a sample with data values of 2.20; 1.98; 1.95; 2.27; 2.25; 2,24; 2.31 Compute the mean.
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A researcher selects a sample of 6 men and 11 women. She asks participants to rate the likelihood they would do female-stereotyped jobs (such as nursing or school teaching) on a scale from 1 = not likely at all to 5 = very likely. Men indicated that they would be less likely to do these jobs (M = 2.1) compared with women (M = 4.3). What is the weighted mean for the combined sample of 17 total participants? O O 2.1 4.3 3.2 3.5
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