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You have decided to resolve scientifically a long-running controversy among commuters, as to which railroad is late more often. People from Connecticut and Westchester County claim that Metro-North is late more frequently, while commuters from Long Island claim that no one is late more often than the Long Island Railroad (LIRR). The Excel file for this check-up contains data you have collected from dozens of trips on each of the two commuter train lines. Perform a hypothesis test to see whether either group of commuters can claim that its train service is late more frequently than the other. Use a 95% confidence interval. Use Excel to make your calculations. Step
1: Formulate the null and alternative hypotheses; specify whether you're running a one or two tail test
Manufacturing and Product Development Midwest Pet Supplies claims its K9 Chain Link Dog Kennel can be set up in less than 30 minutes.
Aggregate the opinions of the experts by computing the minimum, maximum, 25 th percentile, 50 th percentile, and 75 th percentile values.
Let p vary from 0.02 to 0.20 in increments of 0.02. b) Sketch the graph of the probabilities of the lot acceptance as the p value varies from 0.02 to 0.20.
An estimation of per-capita wealth for a city is made from a random sample of people listed in the city's telephone directory.
ou want to know if redesign of the new whole foods has significantly increased sales. you sample 25 customers who shop
How many branch offices were involved in the study and compute the F statistic and test the significance of the relationship at a .05 level of significance.
Suppose that a coin is tossed three times and the side showing face up on each toss is noted. Suppose also that on each toss heads and tails are equally likely.
a study was commissioned to investigate the characteristics of properties that are for sale. data was collected on 60
What are the differences between correlation and regression? What are the common pitfalls of using regression modeling?
How would you determine which test would be appropriate to use? What characteristics of the problem would you use to determine which hypothesis test you should use? Explain your answer.
A researcher wants to see if urban, suburban and rural communities differ in terms of the support for food banks. The researcher randomly chose 4000 food banks from around the country and interviewed the director of each. Calculate the degrees of ..
Suppose n ordinary dice are rolled. What is the chance that the dice show n different faces?
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