Mathematics, 23.11.2019 02:31 draveon353
The mean length of a small counter balance bar is 43 millimeters. there is concern that the adjustments of the machine producing the bars have changed. test the claim at the 0.02 level that there has been no change in the mean length. the alternate hypothesis is that there has been a change. twelve bars (n = 12) were selected at random and their lengths recorded. the lengths are (in millimeters) 42, 39, 42, 45, 43, 40, 39, 41, 40, 42, 43 and 42. the mean of the sample is 41.5 and the standard deviation 1.784. computed t = � 2.193. has there been a statistically significant change in the mean length of the bars?
a) yes, because the computed t lies in the area beyond the critical.
b) no, because the information given is not complete.
c) no, because the computed t lies in the area to the right of �2.718.
d) none of the above.
Answers: 2
Mathematics, 21.06.2019 19:40
Which system of linear inequalities is represented by the graph?
Answers: 1
Mathematics, 21.06.2019 22:50
Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.
Answers: 1
Mathematics, 22.06.2019 00:30
Measure a and b and find their sum. how are the angles related?
Answers: 3
The mean length of a small counter balance bar is 43 millimeters. there is concern that the adjustme...
Mathematics, 07.12.2021 06:50
Physics, 07.12.2021 06:50
Chemistry, 07.12.2021 06:50
Mathematics, 07.12.2021 06:50
Mathematics, 07.12.2021 06:50
Social Studies, 07.12.2021 06:50
Mathematics, 07.12.2021 06:50
Social Studies, 07.12.2021 06:50
Mathematics, 07.12.2021 06:50
English, 07.12.2021 06:50