Confidence interval based on the data
The number of unhealthy days based on the AQI (Air Quality Index) for a random sample of metropolitan areas is shown. Construct a 98% confidence interval based on the data. Show step by step.
61 12 95 40 27 38 93 5 13 40
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The article indicated that 600 FBI agents were required to take a polygraph test. Consider the random variable x = number of the 600 tested who fail. If all 600 agents tested are trustworthy, what are the mean and standard deviation of x?
A safety engineer claims that 3 in 12 automobile accidents are due to driver fatigue. Using the formula for Binomial Distribution find the probability that at least 2 of 5 automobile accidents are due to driver fatigue.
Find the margin of error for mu(mew), if x-bar = 50, n= 16, s= 12 and c= 90.
The number of students who belong to the dance company at each of several randomly selected small universities is shown below. Estimate the true population mean size of a university dance company with 99% confidence. Show step by step.
A researcher wishes to be 99% confident that her estimate of the true proportion of individuals who travel overseas is within 4% of the true proportion. Find the sample size necessary if in a prior study, a sample of 200 people showed that 40 trav
The number of carbohydrates (in grams) per 8-ounce serving of yogurt for each of a random selection of brands is listed below. Estimate the true population variance and standard deviation for the number of carbohydrates per 8-ounce serving of yogu
Consider an experiment to determine the effects of alcohol and marijuana on driving ability with Alpha= .05. Fifteen participants were randomly assigned to have alcohol, marijuana, or neither, and were then tested in a driving simulator. The resul
After observing 120 workers. The manager noticed that their average time was 16.2 minutes. Construct a 92% confidence interval for the mean assembly time.
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