The mean income per person in the united states is $50,000, and the distribution of incomes follows a normal distribution. a random sample of 10 residents of wilmington, delaware, had a mean of $60,000 with a standard deviation of $10,000. at the 0.05 level of significance, is that enough evidence to conclude that residents of wilmington, delaware, have more income than the national average? a. state the null hypothesis and the alternate hypothesis.

b. state the decision rule for 0.05 significance level.
reject h0 if t >

c. compute the value of the test statistic.

d. is there enough evidence to substantiate that residents of wilmington, delaware, have more income than the national average at the 0.05 significance level?

1. the manager of collins import autos believes the number of cars sold in a day (q) depends on two factors: (1) the number of hours the dealership is open (h) and (2) the number of salespersons working that day (s). after collecting data for two months (53 days), the manager estimates the following log-linear model: q 4 equation 1 a. explain, how to transform the log-linear model into linear form that can be estimated using multiple regression analysis. the computer output for the multiple regression analysis is shown below: q4 table b. how do you interpret coefficients b and c? if the dealership increases the number of salespersons by 20%, what will be the percentage increase in daily sales? c. test the overall model for statistical significance at the 5% significance level. d. what percent of the total variation in daily auto sales is explained by this equation? what could you suggest to increase this percentage? e. test the intercept for statistical significance at the 5% level of significance. if h and s both equal 0, are sales expected to be 0? explain why or why not? f. test the estimated coefficient b for statistical significance. if the dealership decreases its hours of operation by 10%, what is the expected impact on daily sales?