Images	Horsepower
	275
	300
	350
	365
	400
	525
	650
	760
	1050
	1775

Use the horsepower data to perform the following calculations:

1. _______ Find the sample size n
2. _______ Find the minimum horsepower
3. _______ Find the maximum horsepower
4. _______ Find the range of the horsepower
5. _______ If this data is to be divided into four bins what is the width of a single bin?
6. Determine the frequency and calculate the relative frequency using four bins.

   Bins (x)	Frequency (f)	P(x)
   _______	_______	_______
   _______	_______	_______
   _______	_______	_______
   _______	_______	_______
   Sum:	_______________	_______________

7. Construct a 95% confidence interval for the mean horsepower.
   1. __________ What is the point estimate for the population mean µ?
   2. df = _________ How many degrees of freedom?
   3. t_c = _________ What is t_c?
   4. The error tolerance E = ____________
   5. The 95% confidence interval for the mean horsepower µ is _______ ≤ µ ≤ _______

Confidence interval statistics
Degrees of freedom	df	= n-1	=COUNT(data)-1
Find a zc value from a confidence level c	zc		=ABS(NORMSINV((1-c)/2))
Find a tc value from a confidence level c	tc		=TINV(1-c,df)
Calculate an error tolerance E of a mean for any n using sx.	E		=tc*sx/SQRT(n)
Calculate a confidence interval for a population mean µ from a sample mean x and an error tolerance E		x-E≤ µ ≤x+E