1. Engineering
  2. Mechanical Engineering
  3. the thrust of a jet engine was measured under the...

Question: the thrust of a jet engine was measured under the...

Question details

The thrust of a jet engine was measured under the same operating conditions and a sample of data points was collected. The process was repeated during 3 different data collection sessions. The resulting 3sets of data are shown in the provided table.

d) Compute the pooled mean and standard deviation. Estimate the true

mean based on pooled values at the 95% probability. List the t -value using 3 decimal points.

Please show explain all steps.

Thank you!!!!

KNOWN:

Three data sets, N = 20

Set1 Set 2 Set 3 50.952.950.1 51.248.950.3 50.3 51.1 51.4 49.651750.5 51.049.9 49.7 50.048.851.6 48.9 52.5 50.5517 49.5 50.951.3 52.4 52.452.6 49.5 51.349.51.6 50.750.3 49.4 52.050.350.8 49.450.250.8 49.750.950.2 50.5 52.150.1 50.749.352.3 9.450.7 48.9 49.950.550.4 49.2 49.7 515 51 2We can find the pooled mean value of the combined data sets M N MN ij j-1 i-1 where M 3 and N-20. The pooled standard deviation M N SF M(N -1) The pooled standard deviation of the means is: SF The degrees of freedom, v M(N-1)-57. From Table 4.4, t$7 952.002 Then, the estimate of the true mean value as: Fpooled: F tv.95SF (95%)

Solution by an expert tutor
Blurred Solution
This question has been solved
Subscribe to see this solution