Degrees of freedom for this t-distribution
A simple random sample of size 100 is taken from a population. The population variance in unknown. The distribution of the standardised sample mean is a t-distribution. What are the degrees of freedom for this t-distribution?
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A population has mean 20. A simple random sample of size 100 is selected from this population. What is the mean of the sample mean?
The enthalpies of the gas at entry asnd exit are 950 kJ/kg and 650 kJ/kg respectively. If the gas flow rate is 5 kg/s, what is the work output from the turbine?
A boiler is used to heat steam at a brewery to be used in various applications such as heating water to brew the beer and sanitizing the brewing tanks.
A sample of size 30 from a normal population with known variance is taken. Which one of the following is most correct regarding the distribution of the standardised sample mean?
Find graphically the magnitude and direction of the resultant force 1 + force 2. any help understanding this type problem would be appreciated.
If instead of being free the rod ends are fixed at room temperature, and then the temperature is raised to 300C, what is the state of stress in the rod at 300C?
In the formula for sample variance based on a sample of size n, why is the sum of squares divided by n-1?
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