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Almost all U.S. light-rail systems use electric cars that run on tracks built at street level.According to the Federal Transit Administration, light-rail is one of the safest modes oftravel, with an accident rate of .99 accidents per million passenger miles as comparedto 2.29 for buses. The following data show the miles of track and the weekday ridershipin thousands of passengers for selected light-rail systems (USA Today, January 7, 2003).City Miles RidersLos Angeles 22 70San Diego 47 75Portland 38 81Sacramento 21 31San Jose 31 30San Francisco 73 164Philadelphia 69 84Boston 51 231Denver 17 35Salt Lake City 18 28Dallas 44 39New Orleans 16 14St. Louis 34 42Pittsburgh 18 25Buffalo 6 23Cleveland 15 15Newark 9 8a. Develop a scatter diagram for these data, treating the number of miles of track as theindependent variable. Does a simple linear regression model appear to be appropriate?b. Use a simple linear regression model to develop an estimated regression equationto predict the weekday ridership given the miles of track. Construct a standardizedresidual plot. Based upon the standardized residual plot, does a simple linear regressionmodel appear to be appropriate?c. Perform a logarithmic transformation on the dependent variable. Develop an estimatedregression equation using the transformed dependent variable. Do the model assumptionsappear to be satisfied by using the transformed dependent variable?d. Perform a reciprocal transformation on the dependent variable. Develop an estimatedregression equation using the transformed dependent variable.e. What estimated regression equation would you recommend? Explain.
a. State the appropriate hypotheses for your significance test. b. Use the sample results to compute the test statistic and the p-value.
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone.
I could reach my target of 2800 at each of the 5 bookies, making my total profit for the month 14000, or hit my target of -12000 for a total loss of 60000 x 25% kickback, making the total loss for the month only 45000.
A normal distribution has a mean of µ = 70 with σ = 12. If one score is randomly selected from this distribution, what is the probability that the score will be less than X = 55?
When sampling is done for the proportion of defective items in a large shipment, where the population proportion is 0.18 and the sample size is 200, what is the probability that the sample proportion will be at least 0.20?
X is a normally distributed random variable with mean 10 and variance 24. a. Find P(X bigger 14) b. find P(8 smaller X smaller 20)
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
Find the degrees of freedom for unequal variance test. (Round down your answer to the nearest whole number.) State the decision rule for .05 significance level. (Round your answer to 3 decimal places.)
Ffor ten randomly selected employees of a company is = 117 - 1.02x. Predict the job performance rating for an employee whose attitude rating is 55.
Find the sample mean and sample standard deviation of the amount citizens spend per year. When finding a confidence interval for the true mean spent of ALL citizens, should we use a z-score or a t-score? Why?
Case Problem - Stateline Shipping and Transport Company and Read the "Stateline Shipping and Transport Company" Case Problem.
The Duracells had an average lifetime of 18.67 hours (SD = 1.176 hours) while the Energizer batteries had an average lifetime of 16.83 hours (SD = 2.878 hours). Assuming the population standard deviations to be equal, what is the test statisitic a..
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