question #14 Express the confidence interval (33.4%,44.4%)(33.4%,44.4%) in the form of p^±E. ___________% ±__________ %
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___________% ±__________ %
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- QUESTION 11 A stock investor would like to have an idea concerning the average return of stocks that are traded on a certain exchange. In a sample of 93 stocks, the average return was 12 percent with a standard deviation of 4 percent. What is the lower boundof the 99% confidence interval? (please express your answer as a PERCENT using 2 decimal places)Question 6 To create a confidence interval from a bootstrap distribution using percentiles, we keep the middle values and chop off some number of the lowest values and the highest values. If our bootstrap distribution contains values for 1000 bootstrap samples, indicate how many we chop off at each end for each confidence level given.Enter the exact answers to all parts. (a) 95%We should chop off values from each end. exact number, no tolerance (b) 85%We should chop off values from each end. exact number, no tolerance (c) 98%We should chop off values from each end. exact number, no tolerance (d) 99%We should chop off values from each end. exact number, no toleranceQuestion 2: You measure 40 backpacks' weights, and find they have a mean weight of 64 ounces. Assume the population standard deviation is 10.6 ounces. Based on this, construct a 95% confidence interval for the true population mean backpack weight.Give your answers as decimals, to two places
- Question 1: You measure 29 randomly selected textbooks' weights, and find they have a mean weight of 31 ounces. Assume the population standard deviation is 7.5 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight.Give your answers as decimals, to two placesQuestion 1 All patients admitted to a particular hospital can be released on the same day or kept overnight for observation. In a sample of 2550 patients, 1020 were kept overnight for observation a) What is the point estimate ?̂ for the proportion of all patients kept overnight for observation? b) Construct a 99% confidence interval for the proportion of all patients kept overnight for observation. Question 2 Grace Floral Shop claims that their average daily earnings is $497. An auditor wants to determine whether this claim is true. The auditor randomly selected a sample of 100 days and found that the sample mean earnings was $495 with a sample standard deviation of 9.75. a) Calculate the 97% confidence interval for the population mean daily earning. Assist the auditor in conducting a hypothesis test, at the 3% level of significance, to determine whether the claim about their average daily earnings was overstated. b) State the null and the alternative hypothesis for this test. c)…question 25 The mayor is interested in finding a 95% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 118 residents whose mean number of pounds of trash generated per person per week was 34.1 pounds and the standard deviation was 8.4 pounds. Round answers to 4 decimal places where possible. a. To compute the confidence interval use a z or t distribution.? b. With 95% confidence the population mean number of pounds per person per week is between ? and ? pounds.
- Step 1 of 3 : Find the point estimate that should be used in constructing the confidence interval. Step 2 of 3 : Find the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places.A sample of 1100 observations taken from a population produced a sample proportion of 0.30. Make a 90% confidence interval for p. Round your answers to three decimal places. _________ to ___________Question 2: Suppose a well-designed and executed survey was performed to estimate the proportion of a population in favor of a proposed law. The interval (0.60, 0.70) was calculated as its 95% confidence interval. 2a: What was the estimated proportion of population in favor of the proposed law? How did you calculate that answer? 2b: What was the margin of error of that survey? How did you calculate that answer? 2c: Are you guaranteed to have the true population proportion in that interval of (0.60, 0.70)? Why or why not? 2d: Suppose 20 different survey firms were to execute the same survey on the same population. How many of those surveys should you expect to contain the true population proportion within their 95% confidence interval? Explain your answer and/or show any calculations. 2e: What should you expect to happen to the width of the 95% confidence interval if a new survey were to survey four times as many people as the original survey?
- A confidence interval for a population mean has a margin of error of 3.3. If the sample mean is 58.6, obtain the confidence interval?Question 2: If the researcher in Question 1 increases the confidence level to 95%, calculate the 95% CI for the average GPA of college students What is the standard error? What is the critical z or t score? What is the 95% CI? Interpret the 95% CI.QUESTION 7 You may need to use the appropriate appendix table or technology to answer this question. How large a sample should be selected to provide a 95% confidence interval with a margin of error of 10? Assume that the population standard deviation is 90. (Round your answer up to the nearest whole number.)