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Quiz 8 Study Guide

Quiz 8 Study Guide - lizards as an indication of a response...

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STAT 250 Fall 2008 Quiz 6 Please put your answers in the spaces provided or circle the correct response. 1. Researchers believe the current mean cost for a family of four to spe nd the day at one of America’s amusement parks has changed from the 2006 mean cost of 148.3 dollars. A simple random sample of 25 families of four yielded a sample mean cost per family of four of 154.2 dollars. Assume the population standard deviation is 17.8 dollars. Test the researchers’ claim at a 0.05 level of significance. Assume the sample of these 25 families is from a normal population. a. H 0 : __ 148.3 ___ b. H : __ 148.3 ____ c. Test Statistic = __ 1.66 ___(Round to two decimal places.) d. p-value = ___ 0.0970 __(Round to four decimal places.) e. At a 0.05 significance level, there is (sufficient insufficient ) evidence to support the claim that the current mean cost for a family of four to spend the day at one of America’s amusement parks differs from 148.3 dollars.

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2. Scientists from the University of Antwerp believe that the mean number of tongue flicks in juvenile
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Unformatted text preview: lizards as an indication of a response of these juvenile lizards to the chemical cues of a viper snake exceeds 400 tongue flicks per 20 minutes. Seventeen juvenile lizards were exposed to the chemical cues of the viper snake. Their responses, in number of tongue flicks per 20 minutes, were recorded with a sample mean of 428.6 tongue flicks and a sample standard deviation of 190.0 tongue flicks. Test the Sci entists’ claim at a 0.05 level of significance. Assume the sample of 17 juvenile lizards is from a normal population. a. H : 400 400 b. H 1 : 400 400 400 400 c. Test Statistic = __ 0.62 ___(Round to two decimal places.) d. Reject Not Reject e. At a 0.05 significance level, there is (sufficient insufficient ) evidence to support the claim that the mean number of tongue flicks in juvenile lizards as an indication of a response of these juvenile lizards to the chemical cues of a viper snake exceeds 400 tongue flicks per 20 minutes....
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