Posted by Kristin on Friday, September 28, 2012 at 4:07pm.
mean = 67.6
standard deviation = 4.2
sample size = 51
Standard error: sd/√n = 4.2/√51 = 0.588
Next step:
67.6 - 1.4 = 66.2
67.6 + 1.4 = 69
Use z-scores:
z = (x - mean)/sd
Therefore:
z = (66.2 - 67.6)/0.588 = -2.38
z = (69 - 67.6)/0.588 = 2.38
Finally:
Check z-table for the probability between the above two z-scores. This will be your answer.
I hope this helps.
Related Questions
statistics - The average temperature in households is 67.6 degrees F. The ...
Statistics 250 - For the past 20 years, the high temperature on April 15th has ...
Statistics - Assume the body temperature of healthy adults are normally ...
statistics - Assume the body temperture of healthy adults are normally ...
statistics - Suppose we have a set of body temperature with a mean of 97.6 ...
Statistics - A random sample of 80 students at a large school shows an average ...
statistics - Assume that body temperatures of healthy adults are normally ...
statistics - Assume that body temperatures of healthy adults are normally ...
statistics - the average temp of the lake is 64.2 degrees and the standard ...
statistics - 2. The daily maximum temperature (T) on an island has approximately...
For Further Reading
