Week 6 Practice Test 2024-02-07 at 12.20.54 PM

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School

American Military University *

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Course

302

Subject

Statistics

Date

Feb 20, 2024

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Pages

Uploaded by Philly040404

< Back to Content @ chatceT @ Week 6 Knowledge Check Homework Practice Questions Week 6 Knowledge Check Homework Practice Questions A survey found that the average daily cost to rent a car in Los Angeles is $102.24 and in Las Vegas is $97.35. The data were collected from two random samples of 40 in each of the two cities and the population standard deviations are $5.98 for Los Angeles and $4.21 for Las Vegas. At the 0.05 level of significance, construct a confidence interval for the difference in the means and then decide if there is a significant difference in the rates between the two cities. Let the sample from Los Angeles be Group 1 and the sample from Las Vegas be Group 2. Confidence Interval (round to 4 decimal places): —Km-m<_ Answer for blank # 1: 2.6236 (50 %) Answer for blank # 2: 7.1564 (50 %) ¥ Hide question 14 feedback Z-Critical Value = NORM.S.INV(.975) = 1.96 LL=(102.24 - 97.35)- 1.96 * 5.982 i 4.212 40 40 UL =(102.24 - 97.35) + 1.96 * 5.982 40 4.21% 40 Question 15 1/ 1 point In a random sample of 29 residents living in major cities on the West Coast (Group 1) and 29 residents living in major cities on the East Coast (Group 2), each individual was asked their age. The results can be seen in the table below. The population standard deviation of the age in West Coast cities is known to be 11.2 years and in East Coast cities is known to be 9.3 years. Assume the populations are normally distributed. Run a test at a 0.05 level of significance to test if west coast cities are, on average, older. ‘West Coast East Coast (Group 1) (Group 2) 25 34 47 45 18 £lif 38 20 30 19 50 26 52 79 61 46 40 29 22 55 34 23 Search Results | Course Hero

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