99% confidence interval of a population proportion is (0.78,0.86) Calculate the sample proportion? Round to two decimal places
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99% confidence interval of a population proportion is (0.78,0.86)
Calculate the sample proportion?
Round to two decimal places
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- Juestion Help ▼ A random sample of 89 eighth grade students' scores on a national mathematics assessment test has a mean score of 273. This fest result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 270. Assume that the population standard deviation is 36. At a =0.06, is there enough evidence to support the administrator's claim? Complete parts (a) through (e). (a) Write the claim mathematically and identify H, and H Choose the correct answer below. Hop=270 H u>270 (claim) Ho:u= 270 (claim) Ho: u2 270 (claim) Hap 270 H: u270 (clainm) Hus270 (claim) H p>270 (b) Find the standardized test statistic z, and its corresponding area. (Round to two decimal places as needed.)Using this data: {4, 5, 8, 11, 16, 8}, (a) Find the 90% confidence interval for the mean. (b) Interpret what does the interval mean?SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? > Next Question & *- 3. 6. 5 12 %23
- Use the normal distribution of IQ scores, which has a mean of 100 and a standard deviation of 18, and the following table with the standard scores and percentiles for a normal distribution to find the indicated quantity. Percentage of scores less than 145 is __% (round to two decimal places as needed)CI on Mean, Variance Known Students on an internship program in the US Fish and Wildlife Service wishes to test the nitrogen content on rivers and waterways in the US Midwest states. 36 sample measurements were taken in various rivers and wate found to be in 2.6 grams per milliliter. Find the 95% and 99% confidence intervals for the mean mercury content. Population standard deviation is 0.3 gram per milliliter. If the students want the error to be less than 0.05, how large a sample size would be required at 95% confidence? Would the required sample size increase if a higher degree of confidence is set? O a. 95% CI: 2.50Distribution of exam scores follows the normal distribution, with a mean of 70 percent and a standard deviation of 10. a) What percent of students scored 85 percent or higher on the exam? b) What was the lowest grade of the students scoring the top five percent of the scores? c) What was the percentage of students earning between 75 and 85 percent on the exam?95% confidence interval for a population mean is (92.0, 96.0). Calculate the sample mean? Round to one decimalCorrect and incorrect option explainDebra attends a fashion institute that has no on-campus housing. The mean distance commuted to campus among all students at the fashion institute is 16 kilometers with a standard deviation of 6 kilometers. The distance Debra commutes is 29 kilometers. (a) Find the z-score of Debra's commute distance relative to the commute distances amongll the students at the institute. Round your answer to two decimal places. (b) Fill in the blanks to interpret the z-score of Debra's commute distance. Make sure to express your answer in terms of a positive number of standard deviations. Debra's commute distance is standard deviations (Choose one) v the mean commute distance among all students at the institute. Submi Continue MacBook Air