Engineering, 15.07.2020 01:01 angellynn581
Twenty-five wooden beams were ordered or a construction project. The sample mean and he sample standard deviation were measured xbar = 190cm, s = 5cm. Calculated confidence interval for the mean is [188.29; 191.71].
Which confidence level was chosen? Assume distribution to be normal.
A. 99%
B. 90%
C. 95%
D. 99.9%
Answers: 1
![CI = [\bar{x} - z\sigma_{\bar{x}} , \bar{x}+z\sigma_{\bar{x}} ]](/tpl/images/0706/1833/6efc6.png)
is 190, we can find the value of 
:
:
Another question on Engineering
Engineering, 04.07.2019 18:10
During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false
Answers: 2
Engineering, 04.07.2019 18:10
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Engineering, 04.07.2019 19:10
With increases in magnification, which of the following occur? a. the field of view decreases. b. the ambient illumination decreases. c. the larger parts can be measured. d. the eyepiece must be raised.
Answers: 1
Engineering, 04.07.2019 19:10
Starting wih an energy balance on a rectangular volume element, derive the one- dimensional transient heat conduction equation for a plane wall with constant thermal conductivity and no heat generation.
Answers: 1
You know the right answer?
Twenty-five wooden beams were ordered or a construction project. The sample mean and he sample stand...
Questions
Mathematics, 18.03.2021 03:20
Mathematics, 18.03.2021 03:20
Mathematics, 18.03.2021 03:20
Mathematics, 18.03.2021 03:20
Biology, 18.03.2021 03:20
Mathematics, 18.03.2021 03:20
Mathematics, 18.03.2021 03:20
History, 18.03.2021 03:20
Mathematics, 18.03.2021 03:20
Mathematics, 18.03.2021 03:20
Mathematics, 18.03.2021 03:20
Chemistry, 18.03.2021 03:20
