A city planner wants to estimate the average monthly residential water usage in the city. He selected a random sample of 38 households from the city, which gave the mean water usage to be 3411.90 gallons over a one-month period. Based on earlier data, the population standard deviation of the monthly residential water usage in this city is 387.80 gallons. Make a 95% confidence interval for the average monthly residential water usage for all households in this city.

Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…

A: Here, mean is 105 and standard deviation is 10.

Q: Dr. Moore wanted to estimate the mean cholesterol level for all adult men living in Hartford... He…

A:

Q: The scores on a standardized test are normally distributed with a mean of 90 and standard deviation…

A: The test score is 0.6 standard deviations above the mean is obtained below: From the given…

Q: he scores on a standardized test are normally distributed with a mean of 115 and standard deviation…

A: The scores on a standardized test are normally distributed with Mean = 115 Standard deviation = 20

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.