statistics
posted by Koia .
A researcher conducted a study of the access speed of 40 hard drives and concluded that his
maximum error of estimate was 15. If he were to conduct a second study to reduce the
maximum error of estimate to 5, about how many hard drives should he include in his new
sample?

statistics 
PsyDAG
SEm = SD/√n
15 = SD/√40 (Calculate SD and insert below.)
5 = SD/√? 
statistics 
Anonymous
A researcher conducted a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in his new sample?
Respond to this Question
Similar Questions

Calculus
The circumference of a sphere was measured to be 74.000 cm with a possible error of 0.50000 cm. Use linear approximation to estimate the maximum error in the calculated surface area? 
Calculus
The circumference of a sphere was measured to be 74.000 cm with a possible error of 0.50000 cm. Use linear approximation to estimate the maximum error in the calculated surface area? 
Statistics
A researcher wishes to estimate, with 95% confidence, the proportion of adults who have highspeed internet access. Her estimate must be accurate within 4% of the true proportion. A) Find the minimum sample size needed, using a prior … 
statistics
A researcher wishes to estimate with 95% confidence the proportion of adults who have high speed internet access. Her estimate must be accurate within 4% of the true proportion. 1. Find the minimum sample size needed using a prior … 
Statistics & Probability
A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives … 
Statistics & Probability
A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives … 
ProbabilityMath
Please forgive me for posting this for the 3rd time but I really need to learn this: A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct … 
calculus
a spherical balloon's radius was measured to be 30 cm with a maximum possible error of 0.2 cm. a) use differentials to estimate the maximum error in the calculated volume. b) what is the relative error? 
Calculus
The radius of a circular disk is given as 51 cm with a maximum error of 0.04 cm. Use differentials to estimate the maximum error and percent error in the calculated area of the disk. 
calculus
The radius of circular disk is 18cm with a maximum error of 0.2cm. Estimate the maximum error in calculated area of the disk. b) The circumference of a sphere was measured to be 64cm with a maximum error of 0.5. Estimate the maximum …