A recent study by the McGraw-Hill company showed that 61% (1621) of college students use their smartphones for studying. The sample size for this poll was 2657 students. Create a 95% confidence interval for the true proportion of all college students who use their smartphones to study. Round to two decimal places.

A researcher wanted to compare the percentages of men and women who play the lottery.  They randomly sampled 300 women and found that 66 of them play the lottery.  In a random sample of 500 men, they found that 160 of them play the lottery.  Construct a 90% confidence interval for the difference in the percentage of women and men who play the lottery. Find the point estimate. Find the margin of error. Interpret the confidence interval in terms of this problem.

Most adults would erase their personal data from the internet if they could. A software firm survey of595 adults showed that 50.3%of them would erase all their personal data if they could. Make a subjective estimate to decide whether the results are significantly low, or high, and then state a conclusion about the original claim.

In Australia, young people aged 18 to 29 have an average of 394 Facebook friends. This population distribution takes only integer values, so it is certainly not Normal. It is also highly skewed to the right. Suppose that = 280 and you take an SRS of 70 Facebook users from this population. Findings from "Yellow social media report 2018. Part one: -Consumers, published by Yellow and available at www.yellow.com.au/wp- content/uploads/2018/06/Yellow-Social-Media-Report-2018- Consumer.pdf. Attempt 2 Side-by-Side For your sample, what are the mean and standard deviation of x, the mean number of friends per user? Use decimal notation. Give your answers to two decimal places if necessary.

Any basketball fan knows that Shaquille O'Neal, one of the NBA's most dominant centers of the last twenty years, always had difficulty shootinq free throws. Over the course of his career, his overall made free-throw percentaqe was 53.3%. Durinq one off-season, Shaq had been working with an assistant coach on his free-throw technique. During the next season, a simple random sample showed that Shag made 26 of 39 free-throw attempts. Test the claim that Shaq has significantly improved his free-throw shooting using a 0.05 significance level. . Check the conditions of the Central Limit Theorem for this scenario. What is the minimum number of free throws Shaq would have to attempt so that it would meet the condition of a large population size?

Construct the 99% confidence interval for the difference when ,-476.88, x-318.32, , -42.11, -26.80, -19, and #₂ -22. Use the TI-84 Plus calculator and round the answers to two decimal places. A 99% confidence interval for the difference in the population means is

A survey showed 980 of 1500 adult respondents believe in global warming. Construct a 95% confidence interval estimate of the proportion of adults believing in global warming.

A poll showed that 385 out of 700 adults said they would be interested in traveling to outer space if given the chance. Create a 95% confidence interval for the true proportion of adults who would travel to space. Enter the lower endpoint of your interval in the first blank and the upper endpoint in the second blank. Enter your answers as decimals rounded to 4 places. Do not round intermediate steps.

When 410 randomly selected college students were surveyed, 155 said they own their car. Construct a 95% confidence interval for the proportion of college students who say they own their cars. Include a statement interpreting your answer.

A research poll of 1501 adults showed that 1051 of respondents believe in global warming. Find a 98% confidence interval estimate for the proportion of adults that believe in global warming. Based on these results, can we safely conclude that the majority of adults believe in global warming and why?