Question

Score: Uoll Out 10.3.7 <20, a simple random sample of size n=18 is obtained from a population that is known to be normally distributed. Answer parts (Hd) To test Hou= 20 versus H BEE Click here to view the t-Distribution Area in Right Tail (a) If x= 18 and s=4.4, compute the test statistic. t= (Round to two decimal places as needed.)

Answer 1

Solution :

This is the left tailed test .

The null and alternative hypothesis is ,

H0 :   $\mu$ =20

Ha : $\mu$ < 20

Test statistic = t

= ( $\bar x$ - $\mu$ ) / s / $\sqrt$ n

= (18-20) / 4.4/ $\sqrt$ 18

Test statistic = -1.93