An automobile manufacturer claims that its van has a 39.0 miles/gallon (mpg) rating. an independent testing firm has been contracted to test the mpg for this van since it is believed that the van has an incorrect manufacturer's mpg rating. after testing 120 vans, they found a mean mpg of 38.8. assume the standard deviation is known to be 2.2. a level of significance of 0.02 will be used. find the value of the test statistic. round your answer to 2 decimal places.

z=-1.00

Step-by-step explanation:

Given : Population mean :

Sample size : n=120  ;

Sample mean:  ;

Standard deviation:

Test statistic for population mean:

Hence, the value of the test statistic : z=-1.00

there has been genes found in the x chromosome of males that have been linked to [homo/hetero]sexuality. in addition to the reign of the x chromosome, a section of chromosome 8 has also been link to, "alot of ppl are so " these facts were proven true after a 2014 study of a gay male and his strait brother. according to newscientist.com,"chromosome 14 and is mainly active in the thyroid, but also the brain. called tshr, it makes a type of receptor protein that recognises and binds to a hormone that stimulates the thyroid. in this way, the gene plays an important role in controlling thyroid function. the fact that tshr seems to be involved in sexual orientation fits with evidence that thyroid function seems to be linked to sexuality."

in conclusion, "ppl are so gay" due to their genetics.

yes

step-by-step explanation: