5.Jse Dataset4, which is posted in Data Sets in Bb. The purpose ofthe anlysis is to predict Income (given in thousands) from Education (given inyears). [Note: although race is given, you will not use it in any of thecalculations for this assignment.]a. Show all steps for calculating a 95% confidence interval for P1. You maycheck your results with R, but for credit you must show all steps.b. Interpret the interval you calculated in part (a). i134Xi41334yi1612171322LO

Confidence interval are used to estimate the range where the true parameter lies. If the confidence…

Answered: "Jse Dataset4, which is posted in Data…

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 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?
Step 2 of 2: Suppose a sample of 779 tenth graders is drawn. Of the students sampled, 202 read at or below the eighth-grade level. Using the data, construct the 95% confidence interval for the population proportion of tenth graders reading at or below the eighth-grade level. Round your answers to three decimal places.
Use R Studio to answer the following question:
What Z score would be used to construct a 90% confidence level? Is it ... a. 1.65 b. 2.33 c. 2.58 d. 1.96
This my third time posting the same question. Because no one answer it straight to me. I already answered the question. Could you please tell me which one of these are not correct. and if so Could you please tell me the correct answer first then explain it. Also could you please highlight the correct answer for each one
A sample of freshman takes a reading comprehension test and their scores are summarized below. Sample scores: 16, 8, 8, 6, 9, 11, 13, 9, 10 a. if the mean for the general population on this test is m=12, can you conclude that this sample is significantly different from the population. Test with a=.05 b. Calculate a 90% confidence interval around your mean.
The mean number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey &8 employees. The number of sick days they took for the past year are as follows: 12; 6; 15; 3; 10; 8; 8; 8. Let X= the number of sick days they took for the past year. Should the personnel team believe that the mean number is about 10? Conduct a hypothesis test at the 5% level. What is the test statistic? (If using the z distribution round your answers to two decimal places, and if using the t distribution round your answers to three decimal places.) What is the p-value? (Round your answer to four decimal places.) Construct a 95% confidence interval for the true mean. Sketch the graph of the situation. Label the point estimate and the lower and upper bounds of the confidence interval. (Round your answers to three decimal places.)
Out of a 54 person sample from our fall Math-150 classes, 12.4% of the students are left-handed. Using a TI 84 graphing calculator: Construct an 80% confidence interval for the population proportion, p. Round to tenths of a percentand write a sentence answer.The U.S. has 13.1% of it’s population that are left-handed. Did this fall in your confidence interval from part a? Be sure to show all calculator commans used.
4. A psychologist has prepared an “Optimism Test" that is administered yearly to graduating college seniors. The test measures how each graduating class feels about its future-the higher the score, the more optimistic the class. Last year's class had a mean score of u = 28. A sample of n = 10 seniors from this year's class was selected and tested. The scores for these seniors are below. Is this year's class different in its level of optimism from last year's class (p < .05)? 19 23 19 25 21 21 26 22 22 20
Come up with your own data for a problem that would ask for a 90% confidence interval utilizing Z. Clearly label your variables.
A study of 1907 traffic fatalities found that 725 were alcohol related. Suppose you want your 99% confidence interval to be accurate within 1% of the population portion, how many traffic fatalities would need to be in the study?
You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of sleep subjects get each night. You measure hours of sleep for 12 subjects with the following results. Construct a 90% confidence interval for the mean number of hours slept for the population (assumed normal) from which you took the data. (Give your answer rounded to the nearest 4 decimal places if necessary.) {7.8, 8.9, 9.5, 11.2, 11.5, 8.3, 11.8, 8.4, 8, 8.4, 10.1, 10.3} (?,? )

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