Exam 7: Survey Sampling and Inference

Use the following information to answer questions (16)-(18). From a random sample of workers at a large corporation you find that 58% of 200 went on a vacation last year away from home for at least a week. -An approximate 95% confidence interval is (0.50, 0.66). Which of the following statements is a correct interpretation?

Complete the statement by filling in the blanks. A larger sample size will improve the precision of the confidence interval, therefore, assuming no other values change, the margin of error will _____ and the confidence interval will be _____.

A survey of 800 randomly selected senior citizens showed that 55% said they planned to watch an upcoming political debate on television. The margin of error for the 95% confidence interval is 3.5 percentage points. Does the confidence interval support the claim that the majority of senior citizens plan to watch the upcoming political debate on television? Explain why or why not.

Use the following information to answer questions (16)-(18). From a random sample of workers at a large corporation you find that 58% of 200 went on a vacation last year away from home for at least a week. -What is the margin of error for the 95% confidence interval of (0.50, 0.66) of coworkers who went on a vacation last year away from home for at least a week?

Which of the following statements is true about the confidence interval for a population proportion?

A survey recently reported that 35% of U.S. citizens believe that we never landed on the moon. The pertinent question in the survey was "Do you think it was possible or impossible that the event of the U.S. landing on the moon never happened?" Select the most accurate statement about this survey.

A survey investigates whether residents of a certain city support an educational tax increase. Which of the following statements are true?

A factory manager is monitoring the quality of production of a small battery powered toy. The factory produces 600 toys in an hour. Thirty toys are tested from each hour's production. Which one of the following statements is the most accurate?

Suppose that Illinois lawmakers survey 130 randomly selected registered voters to see if they favor charging a deposit on aluminum cans to encourage recycling. The lawmakers believe the population proportion in favor of changing the law is 93% (based on historical data and previous votes). Which of the following conditions for the Central Limit theorem are not met?

Use the following information to answer questions (16)-(18). From a random sample of workers at a large corporation you find that 58% of 200 went on a vacation last year away from home for at least a week. -Which of the following statements are correct concerning the 95% confidence interval of (0.50, 0.66) of coworkers who went on a vacation last year away from home for at least a week?

On average, how many of the children attending the event would be expected to be lactose intolerant, give or take how many? Round to the nearest whole person.

Which of the following statements are characteristics of the sampling distribution of a sample proportion?

A polling agency wants to estimate the proportion of U.S. citizens who support the president's educational policies. They surveyed 1500 U.S. citizens and found a 95% confidence interval for the difference in proportions between men and women who support the president's educational policies as (-0.075 to 0.025) where population 1 is men and population 2 is women. Interpret the result and state if the assumptions are satisfied.

Use the following information to answer questions (6)-(8). A marble manufacturer advertises that its bags of marbles will contain 25% "milky-white" marbles. Suppose that a bag containing 80 marbles is inspected. -Use your answers to fill in the blanks: We expect % milky-white marbles, give or take %

If you use an instrument to measure 1 ml of water and do it 3 times, weighing the water each time, you get 0.751, 0.753, and 0.750 grams. One ml of water should weigh 1.0 grams. The measurements are _________.

Frederick is interested in whether residents of his community are opposed to the construction of a party store on the corner of a busy inter

A polling agency wants to estimate the proportion of U.S. citizens who support the president's domestic policies. They surveyed 2500 U.S. citizens and found a 95% confidence interval for the difference in proportions between men and women who support the president's domestic policies as (-0.025 to 0.050) where population 1 is men and population 2 is women. Select the correct interpretation of this result.

Which of the following statements is not true about a sampling distribution?

Which of the following statements is true about the confidence interval for a population proportion?

It is thought that 10% of all children have some level of nearsightedness. 200 randomly selected children, selected without replacement, had their eyesight tested. Can the Central Limit Theorem be used to find a good approximation of the probability that more than 15% of the children will be nearsighted? Which statement is not true?