5. [12 points] minor surgery on horses under field conditions requires a reliable short-term anesthetic producing good muscle relaxation, minimal cardiovascular and respiratory changes, and a quick, smooth recovery with minimal aftereffects so that horses can be left unattended. a research article reports that, for a sample of 73 horses to which ketamine was administered under certain conditions, the sample average lying-down time was 18.9 minutes. does this data suggest that the true mean lying-down time is less than 20 minutes? assume that lying-down time varies according to a normal distribution with population standard deviation 8.6 minutes. test using the level of significance α = 0.10.

there is no evidence for the data to suggest that the true mean lying-down time is less than 20 minutes

Step-by-step explanation:

Given that for a sample of 73 horses to which ketamine was administered under certain conditions, the sample average lying-down time was 18.9 minutes.

So create hypotheses as

(left tailed test at 5% significance level)

Since population std deviation is given and sample size >30 we can useZ test

Std error =

Z statistic = mean diff/std error

=

p value one tailed = 0.138

Since p >0.05 we accept H0

i.e. there is no evidence for the data to suggest that the true mean lying-down time is less than 20 minutes

81 seats

step-by-step explanation:

if you multiply 0.65 times 125 then you get 81.5 seats. well since you can't have half of a seat you have to round down and get 81 seats in the no children zones. that leave 44 seats outside of the no children zone.