An engineer has designed a valve that will regulate water pressure on an automobile engine. the valve was tested on 200 engines and the mean pressure was 5.4 pounds/square inch (psi). assume the population standard deviation is 0.8. the engineer designed the valve such that it would produce a mean pressure of 5.5 psi. it is believed that the valve does not perform to the specifications. a level of significance of 0.05 will be used. find the value of the test statistic. round your answer to two decimal places.

-1.77

Step-by-step explanation:

Let be the population mean.

Given : The engineer designed the valve such that it would produce a mean pressure of 5.5 psi.  It is believed that the valve does not perform to the specifications.

Then ,

Since , the alternative hypothesis is two-tailed , so the test is a two tailed test.

Also. sample size :

Sample mean :

Test statistic for population mean :-

3-4

step-by-step explanation:

the answer is 3-4 because both 45 and 60 has a multiple of 15.

45/3=15

60/4=15

therefore the odds against selecting a red is 4-3

step-by-step explanation:

to find if any function is an inverse of the other, put the first equation in as x in the next one. then simplify and solve. if at the end you get the statement y = x, then it is an inverse. if you get anything else, it is not.