You have these questions on your website, and you have the answer for 95%, please compute a 98% confidence interval. Only compute a 98% confidence interval. Cost to Repair Fire Damage, The mean cost to repair the smoke and fire damage that results from home fires of all causes is $11,389 (HomeAdvisor). How does the damage that results from home fires caused by careless use of tobacco compare? The file TobaccoFires provides the cost to repair smoke and fire damage associated with a sample of 55 fires caused by careless use of tobacco products. Using past years’ data, the population standard deviation can be assumed known with cr = $3027. What is the 95% confidence interval estimate of the mean cost to repair smoke and fire damage that results from home fires caused by careless use of tobacco?  compute also a 98% confidence interval.

If a 90%, a 95% and a 99% confidence interval are foung for a population mean, describe how the 3 interval estimates are related to each other. Which of the 3 intervals is most likely to contain the population mean?

Briefly describe the relationship between confidence interval and hypothesis testing.

What is the effect on a confidence interval if one decreases both sample size and the level of confidence?

Some students think that a 90% confidence interval contains 90% of the data. Use the list of data on the first page and count how many of the data values lie within the confidence interval. What percent is this? Is this percent close to 90%? Explain why this percent should or should not be close to 90%.

Refer to diagram and apply to multiple choice.

You want to construct a 99% confidence interval for the proportion of retail stores that went out of business due to the recent pandemic. You managed to collect a random sample of 93 retail stores and found 15% of them shut down permanently. Construct and interpret the confidence interval.

What will be observed if calculated the three confidence intervals at 90%, 95%, and 99%? How would it be described as confidence intervals?

You plan to find a confidence interval for the percentage of children who have speech delays. A small pilot study finds that 6% of children have speech delays. If you want a 90% confidence interval with a margin of error of 3%, what is the minimum sample size you must take?

PROBLEM: A psychologist asks a random sample of 30 female adolescents and a separate, random sample of 30 male adolescents how much time they spend communicating with others online on an average day. She compares the time spent communicating online of female adolescents with that of male adolescents. In your project include: The problem and data. Calculate and interpret the correct 90% confidence interval for the mean difference in the two groups average time spent communicating online. (Use the 4 steps) Preform the correct significance test to test the claim that females spend more time than males communicating online. Use a level of significance of 0.05 and then use a level of significance of 0.10. Explain your results for each alpha. (Use the 4 steps) Answer the initial question and explain how you should use the confidence interval AND significance test to answer it. Review the rubric to make sure you include all necessary components. 1. Data: Hours…