Entries by Hannah Wangui

standard deviation

September 3, 2019 in /by

Question A company compared the variance of salaries for employees who have been employed for 5 years or less with employees who have been employed for 10 years or more. They randomly selected 21 employees with 5 years or less experience and 15 employees with 10 years or more experience. The standard deviation for the […]

 

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mean

September 3, 2019 in /by

Question A dairy manager would like to estimate the mean number of one gallon milk sold. Assuming that the gallons of milk sold follows the normal distribution with a population standard deviation of 3.01. The manager selects a random sample of 75 sales and finds the mean number of one gallon milk sold is 7.85. […]

 

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mean

September 3, 2019 in /by

Question The mean weight of bushels of wheat sold by a farmer is not known. The farmer needs an estimate of the population mean. He selects and weighs a sample of 55 bushels and finds the mean weight is 80 pounds. The population standard deviation is 3.8 pounds. What is the 90% confidence interval for […]

 

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