The desired percentage of silicon dioxide in a certain type

Reference no: EM13240413

The desired percentage of silicon dioxide in a certain type of cement is 5. A random sample of 36 specimens gave a sample average percentage of 5.21 and a sample standard deviation of 0.38. Use a significance level of 0.01 and test whether ther sample result indicates a change in the average percentage.

Reference no: EM13240413

Questions Cloud

Find the total time the bullet is in contact with the board : A bullet is fired through a board 7.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board, Find the total time the bullet is in contact with the board

What is the difference between data and information : What is the difference between data and information? What are characteristics of good information? How does technology improve the decision making process?

A sample of 10 electronic tubes produced by a company showed : A sample of 10 electronic tubes produced by a company showed a mean lifetime of 1200 hours and a standard deviation of 100 hours. estimate the mean and the standard deviation of the population of all such tubes produced by the company?

What would the atom ratio of uranium mineral from a rock : What would the atom ratio of 206Pb to238U be in a uranium mineral from a rock that is 1.0× 10^9 years old? t1/2(238U)= 4.5 × 10^9 yr.

The desired percentage of silicon dioxide in a certain type : The desired percentage of silicon dioxide in a certain type of cement is 5. A random sample of 36 specimens gave a sample average percentage of 5.21 and a sample standard deviation

Find the maximum velocity and acceleration : The cone of a loudspeaker vibrates in SHM at a frequency of 262 Hz. The amplitude at the center of the cone is xm = 1.5 x 10-4m, What is its maximum velocity and acceleratio

It is important for airlines to know the approximate total : It is important for airlines to know the approximate total weight of the baggage carried on each airplane. An airline researcher believes that the mean baggage for each adult is 60 kg. To test his belief, he draws a random sample of 50 adult passenge..

Explain present-day plant life has a carbon-14 decay rate : Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm) per gram of carbon. If a contemporary wooden chair were somehow preserved for the next 3,900 years, what 14C decay rate should be expected from the wood used ..

Groups differed with respect to the prpportion of workers : Workers in 2 different mine groups were asked what they considered to be the most important labour-management problem. In Group A,

User Account

All Pages