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Question: Conditions. For each situation described below, identify the population and the sample, explain what p and represent, and tell whether the methods of this chapter can be used to create a confidence interval.
a) Police set up an auto checkpoint at which drivers are stopped and their cars inspected for safety problems. They find that 14 of the 134 cars stopped have at least one safety violation. They want to estimate the percentage of all cars that may be unsafe.
b) A TV talk show asks viewers to register their opinions on prayer in schools by logging on to a Web site. Of the 602 people who voted, 488 favored prayer in schools. We want to estimate the level of support among the general public.
c) A school is considering requiring students to wear uniforms. The PTA surveys parent opinion by sending a questionnaire home with all 1245 students; 380 surveys are returned, with 228 families in favor of the change.
d) A college admits 1632 freshmen one year, and four years later 1388 of them graduate on time. The college wants to estimate the percentage of all their freshman enrollees who graduate on time.
Give two alternative representations of the log-likelihood function - How would the log-likelihood function differ for the logit model?
Identify a decision process within your work or business interests that could be resolved based on data.
If 20% of the students entering college drop out before receiving their diplomas, ?nd the probability that out of 20 students picked at random from the very large number of students entering college, less than 3 drop out.
Find a 95% confidence interval for the odds ratio measuring the strength of the relationship between the disease and the exposure. Test for the independence between the disease and the exposure.
Distinguish between the terms population and sample. A complete response should include the definition for each and examples that demonstrate the difference
when 325 college students are randomy selected and surveyed its found that 117 own cars. construct a 99 confidence
An independent-measures t test produced a t statistic with df=20. If the same data had been evaluated with an analysis of variance, what would be the df values for the F-ratio?
a sample has a mean of 39.5 and a standard deviation of 4.3. in a 2 tail hypothesis test with a.05 this sample would
What is the probability that the total number of customers who enter the supermarket in one day is greater than 11700?
The normal serum hemocrit level is 0.41 milligrams to 100 milligrams of blood. The level in elderly patients is significantly low at 0.31.
for the data in the following sample8 1 5 1 5a. find the mean and the standard deviation.b. now change the score of x 8
Compute the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83 last month.
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