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In July of 2004, the Gallup Poll asked 1005 U.S. adults if they actively try to avoid carbohydrates in their diet. That number increased to 27% from 20% in a similar 2002 poll. Is this a statistically significant increase? Explain.
new york city is the most expensive city in the united states for lodging. the mean hotel room rate is 204 per night
Calculate the mean and the standard deviation of the sampling distribution of possible sample proportions for each combination of sample size (n) and population proportion (p).
Give the null and alternative hypotheses for testing whether there exists a positive linear relationship between y and x - What is the difference between what σx and σ-x measure?
Suppose that four American adults are asked if they ate at table-service restaurants last week. What is the probability that all of them say yes?
a polling company obtains an alphabetical list of names of voters in a precinct. they select every 20th person from
1. How does multicollinearity manifest itself in a regression situation? 2. Explain what is meant by perfect collinearity. What happens when perfect collinearity is present?
At the 5% level of significance, can we infer that the difference in the level of satisfaction with service between the two branches is wider than 5 p.c. points?
Compare and contrast a Difference of Means test with a Paired Difference test. What, fundamentally, are we testing for in each? When do you use the difference of means?
Use the Poisson model to approximate the probability. Round your answer to four decimal places.The probability that a call received by a certain switchboard will be a wrong number is 0.02.
What is the difference between an independent and a dependent variable? Does a regression model imply causation? Why or why not?
A consumer agency has retained an independet testing firm to examine a television manufacturer's claim that its 25-inch console lmodel consumes just 110 watts of electricity.
Formulate this as a game on normalform. Find the Bi-matrix. Do there exists a Nash equilibrium in pure strategies of this game? What is a mixed strategi of player 1 in this game?
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