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20e A manufacturer produces both a deluxe and a standard model of an automatic sander designed for home use. Seling prices cbtained from a sample of netail cutets foilow Excel File: datato-27.x Model Price Model Price Retall Ouiet Delase Standard Retail Outet Debus Standard 27 39 39 39 35 30. 34 29 38 30 Round your answers to 2 decimal places a. The manufacturers sugpested retail prices for the two models show a $10 price differential. Use a 05 level of signithicance and test that the mean aierence tetween the prices of the two models is $10 b. what is the 95% corfdence interval for the diference between the mean prices of the two models? to decimals) to 12.76
The average expenditure on Valentines Day was expected to be S100 89 USA Today, Feonary 13, 2006). Do male and female consumers diner in the amo res they spend, The-erage expendi en sample survey of 40 male consumers was $135.67, and the aversge expenditure in a sample survey of 30 femele consumers was $68.64. Based on past surveys, the standard deviation for male consumers is assumed to be $35, and the standard deviation for temale consumers is assumed to be $20. The z value is 2.576 Round your answers to 2 decimal places a. What is the point estimate of the difference between the population mean expenditure for males and the pooulaton mean 67.03 18.39 3 48.65to 5.41 b, At 99% confidence, what is the margin of error? c. Develop a 99% confidence interval for the dir erence between the two pop ation means
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