After computing a confidence interval, the user believes the results are meaninglessbecause the width of the interval is too large. Which one of the following is the bestrecommendation?Reduce the population variance.Increase the level of confidence for the interval.Decrease the sample size.O Increase the sample size.

Here given that interval estimation is too large that is width of interval is too large. Width of…

Answered: After computing a confidence interval,…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The national average for the percentage of high school graduates taking the SAT is 49%, but the state averages vary from a low of 4% to a high of 92%. A random sample of 300 graduating high school seniors was polled across the Cincinnati Tristate Area, and it was found that 195 had taken the SAT. Estimate the true proportion of high school graduates in this region who take the SAT with 95% confidence. What are the logical steps you are going to follow for answering the main question? A.) Calculate point estimate, Za/2 , margin of error, and then the CI. B.) Calculate Za/2, margin of error, CI, and then point estimate. C.) Calculate Za/2, point estimate, margin of error, and then the CI.
A researcher wants to estimate the actual proportion of citizens of a certain country who feel that the president does an acceptable job after 30 months in office. His estimate will be with a 99% confidence interval. How many individuals must the researcher interview if he wants his estimate to be within 2%? Write your answer without using commas.
Can someone help me with this? I think it is because of zeros or NAs but I am not sure which one.
Which of the following would result in the narrowest confidence interval? A sample size of 30 with 95% confidence. A sample size of 30 with 99% confidence. A sample size of 100 with 95% confidence A sample size of 100 with 99% confidence.
Solve the fourth one
A 95% confidence interval for the proportion of all statistics students from a large high school that have a part-time job is (0.225, 0.395). You plan to compute a 99% confidence interval using the same data. Which of the following statements is correct?
If n=14, (x-bar)-33, and s=9, find the margin of error at a 98% confidence level Give your answer to two decimal places.
The police department wants to reduce the margin of error for their 95% confidence interval. If they narrow the confidence interval (without collecting anymore data), does this increase or decrease their level of confidence?
A group of researchers is interested in middle school students and their willingness to appear to stand out. A random sample of 380 middle school students is gathered, and the researchers ask them to wear bright orange shoes to school for a day. In the sample of 380 students, 295 were willing to wear the bright orange shoes. Estimate the overall proportion of middle school students that would be willing to wear bright orange shoes to school for the day. Use a 95% confidence level. All answers to 4 decimal places please. a) Find p̂ b) Find the confidence interval: < p < c) Interpret the 95% confidence interval in context?
Researchers constructed a confidence interval for the mean body temperature of healthy US adults, using a random sample of 1000 healthy adults in the US. They found their 99% confidence interval to be (97, 99) degrees Fahrenheit. Which of the following statements are correct? Select one or more: The sample mean body temperature of the 1000 adults in our specific sample is between 97 and 99. a. Ob. A 90% confidence interval calculated using the same sample data would be narrower than the given confidence interval. We are 99% confident that the average body temperature of all healthy US adults is between 97 and 99 degrees Fahrenheit. O c. O d. We are 99% confident that the average body temperature of the 1000 adults in any randomly selected sample will be between 97 and 99 degrees Fahrenheit. O . If we were to select a new sample of 2000 adults and created a new confidence interval, the width of the new confidence interval would increase. V f. If we were to repeatedly take random samples…
One researcher finds a 95% confidence interval for a prevalence of heart disease in a population as centered at 26.2 percent with margin of error 4.2 percent, and another finds a 90% confidence interval centered at 32.1 percent with margin of error 3.6 percent. Can both be accurate? Why or why not? Yes, because they have different levels of confidence. O No, because the results differ by too much. No, because they have different levels of confidence. Yes, because the confidence intervals overlap. No, because they have different margins of error.
You are interested in constructing a 99% confidence interval for the proportion of all caterpillars that eventually become butterflies. Of the 441 randomly selected caterpillars observed, 59 lived to become butterflies. Round answers to 4 decimal places where possible. a. With 99% confidence the proportion of all caterpillars that lived to become a butterfly is between and b. If many groups of 441 randomly selected caterpillars were observed, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population proportion of caterpillars that become butterflies and about percent will not contain the true population proportion.

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After computing a confidence interval, the user believes the results are meaningless because the width of the interval is too large. Which one of the following is the best recommendation?