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A student working on a summer internship in the economic research department of a large corporationstudied the relation between sales of a product (Y , in millions of dollars) and a population (x, in millionsof persons) in the firm's 50 marketing districts. The normal error regression model was employed. Thestudent first wished to test whether or not a linear association between Y and x existed. The studentaccessed a simple linear regression program and obtained the following information on the regressioncoefficients:95 PercentParameter Estimated Value Confidence Limits Intercept 7.43119 -1.18518 16.0476Slope 0.755048 0.452886 1.05721(a) The student concluded from these results that there is a linear association between Y and x. Isthe conclusion warranted? What is the implied level of significance?(b) Someone questioned the negative lower confidence limit for the intercept, pointing out that dollarsales cannot be negative even if the population in a district is zero. Discuss.
twenty-nine percent of americans say they are confident that passenger trips to the moon will occur in their lifetime.
Approximate y(1) using Euler's method and step sizes of 0.2. Perform these calculations by hand. What is the exact value of y(1)?
The means appear to be very close, but not the variances. (a) At α = .05, is there a difference in variances? (b) Show all steps clearly, including an illustration of the decision rule.
based on the nielsen ratings the local cbs affiliate claims its 1100 pm newscast reaches 41 audience. in a survvey of
a sample survey at a super market showed that 204 of 300 shoppers regularly use coupons. use the large- sample
The following statistics were calculated from pairs of observations where X represents the independent variable and Y represents the dependent variable.
the probability that a person living in a certain city owns a dog is estimated to be 0.3. find the probability that
Construct a hypothesis test to determine whether the average weight of a Smoky Bear moving van is more that 12,000 lb. Us a 5% level of significance.
questionthe table below gives two samples selected from 10 supermarkets of the weekly sales of a popular soft drink.
A knew which of his fellow prisoners were to be set free, then his own probability of being executed would rise from 1/3 to ½ because he would then be one of two prisoners. What do you think of the jailer's reasoning?
Develop an estimated regression equation relating the top speed with the boat's beam and horsepower rating and compute and interpret and R2 and R2a
The four characters required for the passcode, the first must be a number,the 2nd and 3rd must be a number. how many different passcodes can you form?
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