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. tc = _________ What is tc?
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