2. Construct a 95% confidence interval to estimate the proportion of Wingate female students that are left-handed. From class surveys 15 out of 181 female students were left-handed. Interpret your confidence interval.
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Solved in 3 steps
- In a sample survey, 138 students failed the exam out of 200 total students. 1. Calculate the 95% confidence interval for the population prportion of students who failed the exam. 2. Compare the margin of errors at 90%, 95%, and 99% confidence intervals. What happens when the confidence interval increases?9. If a 90% , a 95% and a 99 % confidence interval are found 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 ? Explain your reasoning.Help on part 2
- A marketing firm is interested in studying what types of links are most profitable on their website. They examine a sample of 50 visitors to their website and find that of those visitors 35 clicked on a particular link. a- Construct a 98% confidence interval for the proportion of visitors that click on the link. Interpret. b- The marketing firm wants to estimate the proportion of visitors that click on the site within 2%. If they are to use a 98% level of confidence, how many visitors should be surveyed?Example: You would like to construct a 90% confidence interval for the proportion of graduating seniors that go directly on to graduate school. You randomly sample 386 graduating seniors and find that 73 will be enrolling in graduate school in the upcoming semester. 1. What is your point estimate? 2. Construct a 90% confidence interval for the true proportion of graduating seniors that go directly on to graduate school? 3.How many graduating seniors will you have to sample to have a margin of error within 2%?According to a telephone survey of adults, 86% of homeowners said that owning a home was a good investment, this survey included 1450 homeowners. 1. Construct a 99% confidence interval for the corresponding population proportion. 2. Construct a 97% confidence interval for the corresponding population proportion.
- 1. A university dean is interested in determining the proportion of students who receive some financial aid. The dean randomly selects 200 students and finds that 118 of them are receiving financial aid. Use a 95% confidence interval to estimate the proportion of students on financial aid.help 1A quality control specialist wants to estimate the percentage of defective batteries within 5% from the true value, at the 90% confidence level. How many batteries should be randomly sampled? Round your answer up to a whole number.
- A professor is interested in how attendance influences her class. She goes through her records and determines each student’s final average and the number of days absent. Estimate the average final grade for all students in the professor’s class. Provide a point estimate and a 99% confidence interval. Estimate the average number of days all students are absent from the class. Provide a point estimate and a 95% confidence interval.2.3 The width of a confidence interval is a measure of its precision. The narrower the confidence interval, the more precise is the interval estimate, and vice versa. Describe any three aspects that influence the precision of the width of a confidence interval of a single population mean.4. Researchers are interested in the average heart rate of male college students. Assume a random sample of 130 male college students were taken from 200 students for the study. Find a 95% confidence interval for the actual proportion of students.