Given the following: X= 3,O = 0.4 and n3D37; a 99% confidence interval for the true population mean, P, has a lower bound of upper bound of , rounded to TWO decimal places.
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- What is the upper bound of the two-sided confidence interval?A 95% confidence interval for the mean hours freshmen spent on social media per day was calculated to be (2.5 hours, 3.1 hours). The confidence interval was based on an SRS of size n 100. The standard deviation is given by: %3DA sample of 20 bags of mulch had a mean weight of 52 pounds with a standard deviation of 3.8 pounds. Find the 95% confidence interval of the true mean. Show all your work for or explain how you obtained your answer in the space provided below.
- The lifetime of a certain brand of battery is known to have a standard deviation of 23 hours. Suppose that a random sample of 100 such batteries has a mean lifetime of 39.7 hours. Based on this sample, find a 95% confidence interval for the true mean lifetime of all batteries of this brand. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. What is the lower limit of the 95% confidence interval? What is the upper limit of the 95% confidence interval?A clinical chemist obtained the following data for the alcohol content of a sample of blood: % C2H5OH: 0.084, 0.089, and 0.079. Calculate the 95% confidence interval for the mean assuming that (a) the three results obtained are the only indication of the precision of the method and that (b), from previous experience on hundreds of samples, we know that the standard deviation of the method s 5 0.005% C2H5OH and is a good estimate of s.A researcher is interested in finding a 95% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 133 students who averaged 36.1 minutes concentrating on their professor during the hour lecture. The standard deviation was 13.4 minutes. Round answers to 3 decimal places where possible. b. With 95% confidence the population mean minutes of concentration is between and minutes. c. If many groups of 133 randomly selected members 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 minutes of concentration and about percent will not contain the true population mean minutes of concentration.
- A sample of n=17n=17 data values randomly selected from a normally distributed population has standard deviation s=6.8s=6.8. Construct a 95% confidence interval for the population standard deviation. Round your endpoints to one decimal place.A sample of 14 male college students consumes an average of 14.3 gallons of beer per month, with a sample standard deviation of 5.2 gallons. You can safely assume that the population of monthly beer consumption is Normally distributed. What is the margin of error for a 90% Confidence Interval for the mean? (Leave your answer to two decimal places, ex: 18.12)One method for measuring air pollution is to measure the concentration of carbon monoxide, or CO, in the air. Suppose Nina, an environmental scientist, wishes to estimate the CO concentration in Zagreb, Croatia. She randomly selects 45 locations throughout the city measures the CO concentration at each location. Based on her 45 samples, she computes the margin of error for a 95% t-confidence interval for the mean concentration of CO in Zagreb, in µg/m³, to be 4.28. What would happen to the margin of error if Nina decreases the confidence level to 90%? Nina increases the confidence level to 99%? Nina decreases the sample size to 33 locations? Nina increases the sample size to 65 locations? Answer Bank Increase Stay the same Decrease
- A data set includes 31 body temperatures of healthy adult humans having a mean of 98.3°F and a standard deviation of 0.82°F. Using this sample information, a 99% confidence interval estimate of the mean body temperature is found to be (97.90° , 98.71°). What does this information suggest about the use of 98.6°F as the mean body temperature? A. Since the confidence interval does not include the mean body temperature of 98.6°F, the results suggests that the mean body temperature could not be 98.6°F. B. Since the confidence interval includes the mean body temperature of 98.6°F, the results suggests that the mean body temperature could be 98.6°F. C. Since the confidence interval includes the mean body temperature of 98.6°F, the results suggests that the mean body temperature could not be 98.6°F. D. Since the confidence interval does not include the mean body temperature of 98.6°F, the results suggests that the mean body temperature could be 98.6°F. Click to select your answer. ?An NHANES report gives data for 647 women aged 20–29 years. The BMI of these 647 women was x= 25.8. On the basis of this sample, we want to estimate the BMI u in the population of all 20.6 million women in this age group. We treated these data as an SRS from a Normally distributed population with standard deviation o = 7.1. (a) Give three confidence intervals for the mcan BMI u in this population, using 90%, 95%, and 99% confidence. Enter the lower and upper bound for the 90% confidence interval. (Enter your answers rounded to two decimal places. If you are using Crunchlt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision scttings.) lower bound = uррer bound Enter the lower and upper bound for the 95% confidence interval. (Enter your answers rounded to two decimal places. If you are using Crunchlt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision…It is not taking (0.1404, 0.3596) as the confidence interval