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1. Getting angry at other drivers. Refer to Exercise 8.14. The same Pew Poll found that 38% of the respondents "shouted, cursed or made gestures to other drivers" in the last year.
(a) Construct a 95% con?dence interval for the true proportion of U.S. drivers who did these actions in the last year.
(b) Does the fact that the respondent is self- reporting these actions affect the way that you interpret the results? Write a short paragraph explaining your answer.
2. Cheating during a test. A national survey of high school students conducted by the Josephson Institute of Ethics was sent to 37,328 students, and 24,142 were returned. One question asked students if they had cheated during a test in the last school year.14 Of those who returned the survey, 9054 responded that they had cheated at least two times in the last year.
(a) What is the sample proportion of respondents who cheated at least twice?
a nonprofit company concerned with the school dropout rates in a nearby stats has designed a tutoring program at
A retailer has data on sales in its stores yesterday. It would like a range that has a 50% chance of covering the sales of a randomly selected store today. Which does the retailer need, a prediction interval or a confidence interval?
pretest-posttest design and internal validity threats.answer the question either by writing the design name or by
We forecast that 20% of group 1 and 30% of group 2 will experience outcome. If we recruit the equal number of individuals in each of the groups, how many individuals do we need to study?
If there are 12 business-class passengers and 50 tourist-class passengers on a particular flight, what are the expected value of total luggage weight and the standard deviation of the total luggage weight?
A pensioner receives 2 (thousand dollars) at the beginning of each month. The amount of money he needs to spend during a month is independent of the amount he has and is equal to i with probability Pi , i = 1, 2, 3, 4, i=1 Pi = 1.
the population of completion times is 10.4 minutes, what is the minimum sample size needed for the managers to be 95% confident that their estimate is within 2.2 minutes of u?
The company provide to ensure that an attempted call is blocked (because all circuits are busy) with probability less than 0.01? It is assumed that blocked calls are lost.
The following four comments expand the list given in the text under factors that predict the fees generated by a client that suggest six explanatory variables that can be added to the regres- sion model. Use these to improve the fit of the model s..
One of 4 bus drivers is also arbitarily selected. Let Y denote number of students on his bus. Calculate the expectations of X and Y.
You are conducting a study on what socio-demographic factors could be behind the behavioral problems of students. You are looking at how many times a student was sent to detention. You have information on race, gender, household median income, single..
The probability she must stop at at least one of the last two signals is 0.8. Finally, the probability she must stop at at least one of the first and third Signals is also 0.8.
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