Question: To test Upper H 0 : mu equals20 versus Upper H 1 : mu less than20, a simple random sample of size nequals 18 is

To test

Upper H 0

:

mu

equals20

versus

Upper H 1

:

mu

less than20,

a simple random sample of size

nequals

18

is obtained from a population that is known to be normally distributed. Answer parts (a)-(d).

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Click here to view the t-Distribution Area in Right Tail.

(a) If

x overbar

equals18

and

sequals

4.4,

compute the test statistic.

tequals

nothing

(Round to two decimal places as needed.)

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