how many water specimens are required in the sample?
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A selected sample of ?n water specimens and estimate the mean daily rate of pollution produced by a mining operation. If the EPA wants a 99% confidence interval with a margin of error of 0.8 milligram per liter (mg/L), how many water specimens are required in the sample? Assume prior knowledge indicates that pollution readings in water samples taken during a day have been approximately
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- A survey found that women's heights are normally distributed with mean 62.1 in. and standard deviation 3.3 in. The survey also found that men's heights are normally distributed with mean 67.9 in. and standard deviation 3.4 in. Most of the live characters employed at an amusement park have height requirements of a minimum of 55 in. and a maximum of 62in. Complete parts (a) and (b) below. a. Find the percentage of men meeting the height requirement. What does the result suggest about the genders of the people who are employed as characters at the amusement park? The percentage of men who meet the height requirement is nothing %.A research group wishes to estimate the mean number of hours that high school students spend watching TV on a weekday. A margin of error of E= 0.30 hour is desired. Past studies suggest that a population standard deviation of o=2.2 hours is reasonable. Estimate the minimum sample size required to estimate the population mean with 95% confidence. The required sample size is (Round up to the nearest whole number.) an evalA sample of 16 ten-year-old girls had a mean weight of 71.5 pounds and a standard deviation of 12 pounds. Assuming a normal distribution of weights in this population: a. Calculate a 95% confidence interval for the population mean. b. Calculate a one-sided 95% confidence interval giving a lower bound for the population mean.
- A sample of 42 Charleston County households have a mean income of $36,538 with a standard deviation of $4,094. Find a 95% confidence interval for the true population mean income for households in Charleston County. Round your answers to the nearest dollar.A survey found that women's heights are normally distributed with mean 62.7 in. and standard deviation 2.6 in. The survey also found that men's heights are normally distributed with mean 68.4 in. and standard deviation 3.3 in. Most of the live characters employed at an amusement park have height requirements of a minimum of 56 in. and a maximum of 63 in. Complete parts (a) and (b) below. a. Find the percentage of men meeting the height requirement. What does the result suggest about the genders of the people who are employed as characters at the amusement park? The percentage of men who meet the height requirement is 5.08 %. (Round to two decimal places as needed.) Since most men do not meet the height requirement, it is likely that most of the characters are women. b. If the height requirements are changed to exclude only the tallest 50% of men and the shortest 5% of men, what are the new height requirements? The new height requirements are a minimum of in. and a maximum of (Round to…The average gold content from an ore sample in 36 different locations is found to be 2.6 grams per ton. a. Find the 95% and 99% confidence intervals for the mean gold content in that area. Assume that the population variance is 0.09. b. How large a sample is required if we want to be 95% confident that our estimate of sample mean is off by less than 0.057? c. Compute a 95% confidence interval for the standard deviation of the gold content.In a random sample of twelvetwelve people, the mean driving distance to work was 24.624.6 miles and the standard deviation was 4.54.5 miles. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 9999% confidence interval for the population mean muμ. Interpret the results.A survey found that women's heights are normally distributed with mean 62.4 in. and standard deviation 2.9 in. The survey also found that men's heights are normally distributed with mean 67.5 in. and standard deviation 3.1 in. Most of the live characters employed at an amusement park have height requirements of a minimum of 56 in. and a maximum of 64 in. Complete parts (a) and (b) below. a. Find the percentage of men meeting the height requirement. What does the result suggest about the genders of the people who are employed as characters at the amusement park? The percentage of men who meet the height requirement is nothing%. (Round to two decimal places as needed.) Since most men ▼ do not meet meet the height requirement, it is likely that most of the characters are ▼ b. If the height requirements are changed to exclude only the tallest 50% of men and the shortest 5% of men, what are the new height requirements? The new height requirements are a…You measure 39 textbooks' weights, and find they have a mean weight of 60 ounces. Assume the population standard deviation is 4.4 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight.Give your answers as decimals, to three placesError = ? oz.Interval = ? oz. < μ < ? oz.The mean diameter of a ball bearing produced by a certain manufacturer is 0.60 cm with a standard deviation of 0.04 cm. A sample of 25 ball bearings is randomly selected from a production run. The sample had a mean of 0.60008 and a median 0.60333. What is the standard error for the sample mean? O A. 0.00032 O B. 0.008 O C. 0.0016 O D. 0.00008 O E. 0.00333Federal officials have investigated the problems associated with disposal of hazardous wastes. One disposal site is the abandoned Stringfellow acid pits in Riverside County, Calif. The EPA sampled water from 12 wells in nearby Glen Avon. The EPA standard for maximum allowable radiation level of drinking water is 13.35 pCi/L. Suppose that the sample of 12 water specimens resulted in a sample mean radiation level of 18.97 pCi/L and a sample standard deviation 6.12. Is this sufficient evidence to indicate that the water in Glen Avon has a mean radiation level that exceeds the EPA standard?. Use t test. (a = 0.05) Ho = 13.35 versus Η μ > 13.35 Let μ denote the true mean radiation level for well water in Glen Avon O Reject Null Hypothesis O Failed to Reject Null HypothesisA medical researcher wishes to estimate the mean systolic blood pressure of heart surgery patients the day following surgery. She desires a margin of error of 2.2 mmHg. Past studies suggest that a population standard deviation of 41 mmHg is reasonable. Estimate the minimum sample size needed to estimate the population mean with the stated accuracy. OA. 1,389 OB. 37 OC. 695 OD. 3,056 $ 10 % 9: 17 [7] hp C 8 BICCE 9 ho ) fi num Ik + insert Next 5:04 PM 10/13/2022 prt scr backspace deleteSEE MORE QUESTIONS