Can we conclude, using a .05 level of significance,that the miles-per-gallon (mpg) performance of Model Ais greater than the miles-per-gallon performance of Model B?  Model AModel BSample Size2428Sample Mean29.827.3Sample standard deviation2.561.81 What is the test statisticGroup of answer choices5,513.974.404.00

A popular car manufacturing brand claims that their car model Rex500 has an average highway mileage of 21.50 Km/L, you want to test whether this claim is statistically significant or not.You managed to get data from 45 cars of this model and found that the average highway mileage is 20.42 Km/L, with a standard deviation of 2.7 Km/LWith 99% confidence, will you be able to conclude that the average highway mileage is statistically lower than the claimed fuel economy?Use the appropriate test and select the correct option below:

A local car manufacturer manufactures small automobiles that averaged 50 miles per gallon of gasoline in highway driving.The company has developed a more efficient engine for its small cars and now advertises that its new small cars average more than 50 miles per gallon in highway driving.  In a sample of 36 road-tested automobiles,  it showed an average of 51.5 miles per gallon and a standard deviation of 6 miles per gallon.Test to determine whether or not the manufacturer's advertising campaign is legitimate at 0.05 level of significance and using the p-value approach,  Group of answer choicesWith p-value of 0.0668, therefore, do not reject Ho. There is no sufficient evidence to conclude that the new cars average more than 50 mile per gallon.With p-value of 0.0068, therefore, reject Ho. There is sufficient evidence to conclude that the new cars average more than 50 miles per gallon.With p-value of 0.0724, therefore, do not reject Ho. There is no sufficient to conclude that the new cars average more than 50 miles per gallon.With p-value of 0.0008, therefore, reject Ho. There is sufficient evidence to conclude that the new cars average more than 50 miles per gallon.

A car manufacturer advertises that its new subcompact models get 47 miles per gallon (mpg). Let µ be the mean of the mileage distribution for these cars. You assume that the manufacturer will not underrate the car, but you suspect that the mileage might be overrated. State the null hypothesis and the alternate hypothesis for this case.a.H0: µ = 47mpg  and H1: µ ≠ 47mpgb.H0: µ = 47mpg  and H1: µ < 47mpgc.H0: µ = 47mpg  and H1: µ > 47mpgd.H0: µ ≥ 47mpg  and H1: µ < 47mpg

Based on the p-value, what is your conclusion (use .05 significance level)?

he p-value for the hypothesis test is 0.0139 , which means the observed difference is/ is noy statistically significant at the 5% level