c. Using Emily's sample results, construct a 90% confidence interval estimate of the proportion of correct responses made by touch therapists.
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- Find the sample size needed to estimate the percentage of adults who can wiggle their ears. Use a margin of error of 3 percentage points and use a confidence level of 90%. Complete parts (a) and (b) below. a. Assume that p and q are unknown. n= (Round up to the nearest integer.)A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 3 points with 99% confidence assuming s=17.8 based on earlier studies? Suppose the doctor would be content with 99% confidence. How does the decrease in confidence affect the sample size required? a. A 99% confidence level requires _______ subject. b. 90% confidence level requires ________ subject. c.How does the decrease in confidence affect the sample size required? a.Decreasing the confidence level decreases the sample size needed. b.Decreasing the confidence level increases the sample size needed. c.The sample size is the same for all levels of confidence.In a survey of 2074 adults in a recent year, 744 made a New Year's resolution to eat healthier. Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence The 90% confidence interval for the population proportion p is D. (Round to three decimal places as needed.)
- What do you value most when shopping in a retail store? According to a survey, 27% of consumers value personalized experience most. Complete parts (a) through (d) below. a. Suppose that the survey had a sample size of n=800. Construct a 95% confidence interval estimate for the population proportion of consumers that value personalized experience most when shopping in a retail store? (Pound to four decimal places as needed.)Jse the sample data and confidence level given below to complete parts (a) through (d). A drug is used to help prevent blood clots in cértain patients. In clinical trials, among 4334 patients treated with the drug, 12 developed the adverse reaction of nausea. Construct a 95% confidence interval for the proportion of adverse reactions. a) Find the best point estimate of the population proportion p. (Round to three decimal places as needed.) b) Identify the value of the margin of error E. E =II. A. Find the t-value corresponding to each level of confidence and degrees of freedom. (2 pts) 1. 90% confidence level and n= 12 2. 99% confidence level and n=20 3. a =1% and n= 16
- This Quiz: 10 pts possi Use the sample data and confidence level given below to complete parts (a) through (d). A drug is used to help prevent blood clots in certain patients. In clinical trials, among 4549 patients treated with the drug, 123 developed the adverse reaction of nausea. Construct a 99% confidence interval for the proportion of adverse reactions. a) Find the best point estimate of the population proportion p. (Round to three decimal places as needed.) b) Identify the value of the margin of error E. E= (Round to three decimal places as needed.) c) Construct the confidence interval.Please answer all. Thank you. The width of a confidence interval for a proportion will be A.) wider for sample of size 100 than for a sample size of 50 B.) wider when the sample proportion is 0.50 than when the sample proportion is 0.20 C.) wider for 90 percent confidence than for 95 percent D.) narrower for 99 percent confidence than for 95 percent Which of the following is not a property of a normally distributed data. A.) the mean, median and mode coincide at the center B.) area under curve is 1 C.) the width of curve is determined by the mean of distribution. D.) the curve is symmetrical about its center.9 The standard error of the mean is, a 0.881 b 0.735 c 0.612 d 0.510You are interested in finding a 90% confidence interval for the mean number of visits for physical therapy patients. The data below show the number of visits for 13 randomly selected physical therapy patients. Round answers to 3 decimal places where possible. 15 26 28 28 14 11 18 20 5 19 15 14 19 a. To compute the confidence interval use a Correct distribution. b. With 90% confidence the population mean number of visits per physical therapy patient is between and visits. c. If many groups of 13 randomly selected physical therapy patients are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of visits per patient and about percent will not contain the true population mean number of visits perUse the given confidence interval to find the margin of error and the sample proportion. (0.596,0.626) E= (Type an integer or a decimal.) p%3D(Type an integer or a decimal.) Type here to search10 The interval estimate is, a 12.2 13.4 b 11.8 13.8 c 11.1 14.5 d 10.0 15.6SEE MORE QUESTIONS