11.87 11.48 14.13 9.34 8.63 Send data to Excel art: 0 / 2 art 1 of 2 onstruct an 80% interval for the mean weight of two-month-old baby girls. Round the answers to three decimal places. n 80% confidence interval for the mean weight of two-month-old baby girls is < u<
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- A statistics professor for STAT 250 wants to investigate how long it takes students to complete exercise . The time is recorded in minutes. A student who completed the exercise in 50:30 (50 minutes and 30 seconds) would be recorded as 50.5 minutes a) Summary statistics: Column Mean Std. dev. Time 47.20 8.66 Are these measures you obtained parameters or statistics in part (a) and why? Answer this question in one sentence? Does your confidence interval capture the mean time calculated in part (a)? Answer this question in one sentence. If we were to take 500 samples of size 26 from this population and construct a confidence interval for each sample, approximately how many of these confidence intervals would be expected to capture the mean time calculated in part (a)? Answer this question and provide your reasoning in one or two sentences. b) Summary statistics: Column Mean Std. dev. Sample 6 (Time) 48.33 10.50 Are these measures you found…7.2.14 In a test of the effectiveness of garlic for lowering cholesterol, 43 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes (before- after) in their levels of LDL cholesterol (in mg/dL) have a mean of 4.7 and a standard deviation of 15.8. Construct a 99% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol? Click here to view a t distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. What is the confidence interval estimate of the population mean u? mg/dL <µ< mg/dL (Round to two decimal places as needed.) Question Viewer9.8 Identify the test statistic. t = _____ (Round to two decimal places as? needed.) Identify the p-value. p= ____ (Round to three decimal places as needed.) (b) Construct the confidence interval that could be used for the hypothesis test described in part (a). What feature of the confidence interval leads to the same conclusion reached in part (a)? The confidence level is ____ year (s) < ?d < ____ year (s). Round to one decimal place.
- Q2 Mutation for Facial Flushing Q2.1 Conditions for Confidence Interval The mutation identified in a clinical setting as producing facial flushing and increased heart rate when alcohol has been consumed is called ALDH22. People with this genetic variant are at a higher risk for esophageal cancer. Suppose that you have a random sample of 300 people and find 32 people with the ALDH22 mutation. We would like to estimate the proportion of people with the ALDH2*2 mutation with 95% confidence. State the conditions AND comment on whether each has been met to estimate this proportion. Save Answer Q2.2 Mechanics for Confidence Interval The mutation identified in a clinical setting as producing facial flushing and increased heart rate when alcohol has been consumed is called ALDH22. People with this genetic variant are at a higher risk for esophageal cancer. Suppose that you have a random sample of 300 people and find 32 people with the ALDH22 mutation. We would like to estimate the proportion…Drill lifetime: A sample of 50 drills had a mean lifetime of 12.73 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 6.89. Part: 0/3 Part 1 of 3 (a) Construct a 95% confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your answers to at least two decimal places. 10. The confidence interval is X7.3.11-T Question Help A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 19 subjects had a mean wake time of 97.7 min and a standard deviațion of 42.1 min. Assume that the 19 sample values appear to be from a normally distributed population and construct a 95% confidence interval estimate of the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective? Find the confidence interval estimate. minHow many computers? In a simple random sample of 155 households, the sample mean number of personal computers was 1.14. Assume the population standard deviation is a-0.46. Part: 0/4 Part 1 of 4 (a) Construct a 99.5% confidence interval for the mean number of personal computers. Round the answer to at least two decimal places. A 99.5% confidence interval for the mean number of personal computers isanswer bConsider a two-tailed test with a level of confidence of 84.90%. The z-value is _______. 2.88 1.44 1 2.117.2.19-T Question Help A food safety guideline is that the mercury in fish should be below 1 part per million (ppm). Listed below are the amounts of mercury (ppm) found in tuna sushi sampled at different stores in a major city. Construct a 99% confidence interval estimate of the mean amount of mercury in the population. Does it appear that there is too much mercury in tuna sushi? 0.61 0.74 0.11 0.88 1.23 0.58 0.86 O What is the confidence interval estimate of the population mean u? ppm7.2.19-T Question Help A food safety guideline is that the mercury in fish should be below 1 part per million (ppm). Listed below are the amounts of mercury (ppm) found in tuna sushi sampled at different stores in a major city. Construct a 98% confidence interval estimate of the mean amount of mercury in the population. Does it appear that there is too much mercury in tuna sushi? 0.55 0.76 0.09 0.98 1.26 0.58 0.94 D What is the confidence interval estimate of the population mean u? ppm< μ (Round to three decimal places as needed.) ppmThunderstorm Speeds A meteorologist who sampled 10 thunderstorms found that the average speed at which they traveled across a certain state was 12 miles per hour. The standard deviation of the sample was 2.2 miles per hour. Use a graphing calculator and round the answers to at least one decimal place. Part 1 of 2 Find the 85% confidence interval of the mean. Assume the variable is normally distributed. 10.9 < u < 13.1 Part: 1/ 2 Part 2 of 2 If a meteorologist wanted to use the highest speed to predict the times it would take storms to travel across the state in order to issue warnings, what figure would she likely use? The meteorologist should use miles per hour for the prediction.SEE MORE QUESTIONSRecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons Inc
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