Answered: (a) State the nul hypothesis Ng and the…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 6E

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n(1-p)-
tost
() Perform a Z-test. Here is some information to help you with your Z-test.
• Foas is the value that cuts off an area of 0.05 in the right tail of the distribution.
• The value of the test statistic is given by z
p(1-p)
Standard Normal Distribution
Step 1 Seiect one taled or twotalied.
O One taled
O Teo-taried
Step 2: Enter the otical velue)
(Nound ta 3 decimal places)
Step 3 trter the test statistic
(Nound to 3 deimal places)

Transcribed Image Text:According to a report done last year by the dental industry, 85% of dentists would recommend Stary Whites toothpaste. Ater some recent negative publicity the sales team at Starry Whites suspects the proportion of dentists who now recommend the brand is lower. The team chooses 150 dentists at random and asks them whether they'd recommend the brand. Of thase, 122 say they'd recommend n. Complete the parts beiow to pertorm a hypothesis test to see if there is enough evidence, at the 0.05 level of significancn, to conclude that the praportion, p, of all dentista who now recommend this brand is less than 85%. (a) State the null hypothesis lg and the alternative hypothesis , that you would use for the test. (b) For your hypothesis test, you will use a 2-test. Find the values of mp and n (1-p) to confirm that a Z-test can be used. (One standard is that np10 and (1-p)10 under the astumption that the null hypothesis is true.) Here is the sample size and p is the population proportion you are testing n(1-p) - () Perfurm a Z-test. Here is some information to help you with your 2-test. Submit Assignme Continue 2011

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