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- In a recent Zogby International Poll, nine of 48 respondents rated the likelihood of a terrorist attack in their community as “likely” or “very likely”. Use the “plus four” method to create a 98% confidence interval for the proportion of American adults who believe that a terrorist attack in their community is likely or very likely. Interpret your confidence interval.In a random sample of 190 adults (ages 21-30), it was found that 70% of them have received speeding tickets. Based on this data, what would be the 90% confidence interval of the true proportion of young adults who have received speeding tickts?It was found that in a sample of 90 teenage boys, 70% of them have received speeding tickets. What is the 90% confidence interval of the true proportion of teenage boys who have received speeding tickets? Given the above information, how many boys must be sampled to be within 2% of true proportion in a 90% confidence interval? b. If no information is given for the proportion, how many boys must be sampled?
- It was found that in a sample of 90 teenage boys, 70% of them have received speeding tickets. What is the 90% confidence interval of the true proportion of teenage boys who have received speeding tickets?Gallup is a company that conducts daily opinion polls on a variety of topics. In a recent daily survey of 1,000 randomly selected adults in the United States, 38% of the sample said they were committed to their work. Based on this sample, which of the following is a 97% confidence interval for the proportion of all adults in the United States who would say they are engaged in their work? Select one: a. (0.347, 0.413) b. (0.319, 0.441) c. (0.350, 0.410) d. (0.365, 0.395) e (0.340, 0.420)A research group studying cell phone habits asked the question “Do you ever use your cell phone to make a payment at a convenience store?” to people selected from two random samples of cell phone users. One sample consisted of older adults, ages 35 years and older, and the other sample consisted of younger adults, ages 18 years to 34 years. The proportion of people who answered yes in each sample was used to create a 95 percent confidence interval of (0.097,0.125)(0.097,0.125) to estimate the difference (younger minus older) between the population proportions of people who would answer yes to the question. Which of the following is the best description of what is meant by 95 percent confidence? In repeated random sampling with the same sample size, approximately 95% of the sample proportions from the younger group will be between 0.097 and 0.125 greater than the sample proportion from the older group. A In repeated random sampling with the same sample size,…
- A statistics student wants to conduct a study to determine the proportion of workers in Cititon who commute to another town for work. If the student wants a 90% confidence interval with a margin of error of 2%, how many workers should be in her sample?in a random sample of 800 austin automobile owners, it was found that 480 would like to see the size of the cars reduced. A 95% confidence interval for the proportion of all austin car owners who would like to see another car is: a) (0.532, 0.667) b) (0.572, 0.628) c) (0.566, 0.634)A recent study on the way that people talk indicated, with 95 percent confidence, that between 35 percent and 41percent of all adults find the word “whatever” to be the most annoying word in conversation.Based on the confidence interval, which of the following claims is supported?(A) Less than 25 percent of all adults find the word “whatever” to be the most annoying word in conversation.(B) More than 30 percent of all adults find the word “whatever” to be the most annoying word in conversation.(C) More than 45 percent of all adults find the word “whatever” to be the most annoying word in conversation.(D) More than half of all adults find the word “whatever” to be the most annoying word in conversation.(E) At least 95 percent of all adults find the word “whatever” to be the most annoying word in conversation.