Arandom sample of eighth grade students' scores on a national mathematics assessment test has a mean score of 278278. this test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 270270. assume that the population standard deviation is 3838. at alphaαequals=0.150.15, is there enough evidence to support the administrator's claim? complete parts (a) through

Step-by-step explanation:

Given that sample size n = 88, for eight grade students

scores on a national mathematics assessment test has a mean score of 278. This test result prompts a state school administrator to declare that

x bar >270

(One tailed test at 15% sign level)

Since sigma, population sd is known and sample size is large we use z test

Std error =

Mean difference 278-270=8

Z statistic =

p value = 0.024

Since p <alpha, the administrator's declaration is correct.

25.3

step-by-step explanation:

1st step

add 3+6

=9

multipy 9*3

=37