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Question: In May 2008, CNN reported that Sports Utility Vehicles (SUVs) are plunging toward the "endangered" list. Due to soaring oil prices and environmental concerns, consumers are replacing gas-guzzling vehicles with fuel-efficient smaller cars. As a result, there has been a big drop in the demand for new as well as used SUVs. A sales manager of a used car dealership believes that it takes 30 days longer to sell an SUV as compared to a small car. In the last two months, he sold 18 SUVs that took an average of 95 days to sell with a standard deviation of 32 days. He also sold 38 small cars with an average of 48 days to sell and a standard deviation of 24 days.
a. Construct the null and the alternative hypotheses to contradict the manager's claim.
b. Compute the value of the test statistic under the assumption that the variability of selling time for the SUVs and the small cars is the same.
c. Implement the test at α = 0.10 and interpret your results.
For commercial banks in each state, the U.S. Federal Deposit Insurance Corporation has listed their total deposits (billions of dollars) as follows.- Construct a frequency distribution and a histogram for these data.
Could this information be viewed as representing the ratio scale of measurement? If so, explain your reasoning. If not, why not?
A researcher believes that if she uses a different text the students will score differently on the standardized test but she doesn't know what the difference is.
Identify the sample and population. Also, determine whether the sample is likely to be representative of the population.
The number of planes arriving per day at a small private airport is a random variable having a Poisson distribution with λ = 28.8. What is the probability that the time between two such arrivals is at least 1 hour?
an electronics company wants to compare the quality of their cell phones to the cell phones from three competitors.
Compute the unit manufacturing cost of the product under the contribution approach. Compute the effect on net income of accepting a special order for 500 units at $10 per unit assuming excess capacity.
a shipment of 100 cereal boxes is delivered to a grocery shop. the manager is told that the weights of cereal boxes are
The data table below tabulates a pizza parlor's advertising expenditures and sales for 8 consecutive quarters. The marketing manager wants to know how much of an impact current advertising will have on sales two quarters from now.
A bond analyst is analyzing the interest rates for equivalent municipal bonds issued by two different states. At= .05, is there a difference in the interest rates paid by the two states?
What is the probability that the person thinks that "Made in America" ads boost sales and uses social media online?
The numbers of snake-approach responses after treatment are listed in the table. Name the independent variable and its levels. Name the dependent variable. Compute SStot, SStreat and SSerror.
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