Q4:
A water distribution company randomly selected 625 subscribers to determine the monthly average water consumption of 25000 subscribers. The monthly average consumption calculated for these is 20 m3 and the standard deviation is 4 m3. Determine the confidence limits of the main mass monthly water consumption with 99% probability.
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Q4: A water distribution company randomly selected 625 subscribers to determine the monthly average water consumption...
A cruise company would like to estimate the average beer consumption to plan its beer inventory levels on future seven-day cruises. (The ship certainly doesn't want to run out of beer in the middle of the ocean!) The average beer consumption over 24 randomly selected seven-day cruises was 81,689 bottles with a sample standard deviation of 4,574 bottles. a. Construct a 99% confidence interval to estimate the average beer consumption per cruise. The 99% confidence interval to estimate the average...
A cruise company would like to estimate the average beer consumption to plan its beer inventory levels on future seven-day cruises. (The ship certainly doesn't want to run out of beer in the middle of the ocean!) The average beer consumption over 15 randomly selected seven-day cruises was 81,784 bottles with a sample standard deviation of 4,549 bottles. A. Construct a 99% confidence interval to estimate the average beer consumption per cruise The 99% confidence interval to estimate the average...
The average monthly mortgage payment for all homeowners in a city follows a normal distribution with a mean of $2850 and a standard deviation of $420. Find the probability that the monthly mortgage paid by a randomly selected homeowner from this city is: less than $2100 more than $2600 between $3200 and $3700
The average per capita daily water consumption in a village in Bangladesh is about 83 liters per person and the standard deviation is about 11.9 liters per person. Randomly samples of size 50 are drawn from this population and the mean of each are determined. A)Find the mean and standard deviation of the sampling distribution of sample means. (b) What is the probability that the mean per capita daily water consumption for a given sample is more than 85 liters...
A cruise company would like to estimate the average beer consumption to plan its beer inventory levels on future seven-day cruises. (The ship certainly doesn't want to run out of beer in the middle of the ocean!) The average beer consumption over 21 randomly selected seven-day cruises was 81785 bottles with a sample standard deviation of 4,544 bottles. Complete parts a and b below. a. Construct a 80% confidence interval to estimate the average beer consumption per cruise. The 80%...
Q4) A national air traffic control system handled an average of 47,665 flights during 29 randomly selected days in a recent year. The standard deviation for this sample is 6,208 flights per day. Complete parts a through c below. a. Construct a 99% confidence interval to estimate the average number of flights per day handled by the system. The 99% confidence interval to estimate the average number of flights per day handled by the system is from a lower limit...
It is desired to determine the average concentration of lead in the water of a river. It uses a preliminary sample to estimate the variability. The preliminary sample indicates that the standard deviation is 0.4 Microg. a) To estimate the lead we must first obtain the sample size that guarantees that the experiment is successful. Determine the sample size required to obtain an error in the average estimate of 0.05 g with 90% confidence. b) Obtain the confidence interval for...
According to the records of an electric company serving the Boston area, the mean electricity consumption for all households during winter is 1650 kilowatt-hours per month. Assume that the monthly electricity consumptions during winter by all households in this area have a normal distribution with a mean of 1650 kilowatt-hours and a standard deviation of 320 kilowatt-hours. Find the probability that the monthly electricity consumption during winter by a randomly selected household from this area is less than 1861 kilowatt-hours.
According to the records of an electric company serving the Boston area, the mean electricity consumption for all households during winter is 1650 kilowatt-hours per month. Assume that the monthly electricity consumptions during winter by all households in this area have a normal distribution with a mean of 1650 kilowatt-hours and a standard deviation of 320 kilowatt-hours. Find the probability that the monthly electricity consumption during winter by a randomly selected household from this area is less than 1907 kilowatt-hours....
Statistic course You are performing a study about daily water consumption of UVI Students (in fluid ounces). You randomly select 20 students and record the daily water consumption shown below: 81 60 90 87 75 80 66 75 82 84 82 64 100 94 77 94 70 79 75 85 3. Find the five-number summary and construct a box and whisker plot for the data set. (7 pts.) 4. Find the variance and Standard deviation of the data set. Round...