The state education commission wants to estimate the fractio…
The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the eighth grade level. Provide answers to each of the following steps: You must show your work or explain your calculator speak. Answers without one or the other will not be given full credit.Step 1. Suppose a sample of 269 tenth graders is drawn. Of the students sampled, 45 read at or below the eighth grade level. Using the data, estimate the proportion of tenth graders reading at or below the eighth grade level. Enter your answer as a fraction or a decimal number rounded to three decimal places.Answer: ____________________ Step 2. Suppose a sample of 269 tenth graders is drawn. Of the students sampled, 45 read at or below the eighth grade level. Using the data, construct the 80% confidence interval for the population proportion of tenth graders reading at or below the eighth grade level. Round your answers to three decimal places.Answer: Lower endpoint: _______________ Upper endpoint: _______________ Type your answers only to these questions in the box below. Then show all work on your answer sheet. If using a graphing calculator, the work shown on the answer sheet must show commands used. Answers without work shown will result in the question being scored a 0.
Read DetailsThe following measurements (in picocuries per liter) were re…
The following measurements (in picocuries per liter) were recorded by a set of carbon monoxide detectors installed in a waste disposal facility: 861, 799, 789, 858, 800, 831 Using these measurements, construct a 99% confidence interval for the mean level of carbon monoxide present in the facility. Assume the population is approximately normal. You must show your work or explain your calculator speak. Answers without one or the other will not be given full credit. Provide answers to each of the following steps:Step 1. Calculate the sample mean for the given sample data. Round your answer to two decimal places, if necessary.Answer: ____________________ Step 2. Calculate the sample standard deviation for the given sample data. Round your answer to two decimal places, if necessary.Answer: ____________________Step 3. Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.Answer: ____________________Step 4. Construct the 99% confidence interval. Round your answer to two decimal places.Answer: Lower endpoint: _______________ Upper endpoint: _______________ Type your answers only to these questions in the box below. Then show all work on your answer sheet. If using a graphing calculator, the work shown on the answer sheet must show commands used. Answers without work shown will result in the question being scored a 0.
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