In a random sample of 1,250 adult drivers, 450 said that they would cut their driving by 10 percent if this significantly helped the environment. Find a 96 percent confidence interval estimate of the proportion of adult drivers who are willing to cut their driving by 10 percent to help the environment.
In a random sample of 1,250 adult drivers, 450 said that they would cut their driving...
A website reported that 31% of drivers 18 and older admitted to texting while driving in 2009. In a random sample of 800 drivers 18 years and older drawn in 2010, 204 of the drivers said they texted while driving. Complete parts a through c below. a. Construct a 99% confidence interval to estimate the actual proportion of people who texted while driving in 2010. A 99% confidence interval to estimate the actual proportion has a lower limit of nothing...
part b: what is the margin of error for this sample ?
part c: is there any evidence that this proportion has changed
since 2009 based on this sample ?
A website reported that 32% of drivers 18 and older admitted to texting while driving in 2009. In a random sample of 200 drivers 18 years and older drawn in 2010, 39 of the drivers said they texted while driving Complete parts a through c below a. Construct a 95%...
A random sample of 78 students were interviewed and 59 said they would vote for a democrat in the 2008 election. 1. Let p represent the proportion of all students at this college who will vote for a democrat. Find a point estimate p for p. 2. Find a 90% confidence interval for p. 3. What assumptions are required for the calculations of part (b)? Do you think these assumptions are satisfied? Explain 4. How many more students should be...
Out of a random sample of 200 youth, 50 are found to be careless drivers. Out of a random sample of 400 adults, 64 are found to be careless drivers. a. Determine, at a 1% significance level, if there is good evidence that the proportion of youth who are careless drivers is different than the proportion of adults who are careless drivers b. Form a 99% confidence interval for the difference in proportion of youth and adults who are careless...
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A random sample of 7792 dentists in New York showed that 2976 provided some charity care. Let p be the (unknown) true proportion of dentists in New York who provide some charity care. We want to estimate p a) What was the sample proportion, p, of dentists in the sample who provided some charity care? b) What was the sample proportion of dentists in the sample who provided no charity care? c) what is...
When a survey asked subjects whether they would be willing to accept cuts in their standard of living to protect the environment, 370 of 1150 subjects said yes. (a) Find the point estimate of the proportion of the population who would answer yes. (b) Find the margin of error for a 95% confidence interval. (c) Construct the 95% confidence interval for the population proportion. What do the numbers in this interval represent?
In a random sample of 198 people, 170 said that they watched educational television. Find the 92% confidence interval of the true proportion of people who watched educational television.
Suppose a simple random sample of 4,000 Americans were surveyed and 2,200 of them said they have brown colored eyes. a. Create a 95% confidence interval estimator for the population proportion of Americans that have brown colored eyes. b. What is the minimum same size that would be required to estimate the population’s proportion with an error of 0.025 at a 98% level of confidence? Assume there is no point estimate.
A survey found that out of a random sample of 200 workers 168 said that they were interruped 3 or more times an hour by phone messages, etc find the 90% confidence interval of the pop proportion of workers who are interupted 3 or more times
4. A random sample of 1003 adult Americans was asked, "Do you pretty much think televisions are a necessity or a luxury you could do without?" Of the 1003 adults surveyed, 521 indicated that televisions are a luxury they could do without (A) Obtain a point estimate for the population proportion of adult Americans who believe that televisions are a luxury they could do without. (B) Verify that the requirements for constructing a confidence interval about p are satisfied. (C)...