Question

Ho u >= 75 HA u < 75 A sample of 30 items was taken from a large population. The sample mean was 72 and the population standard deviation was 7. Using alpha = 0.05, what is the critical value? 1.96 O 1.645 0 -1.645 -1.96 Question 4 Consider the following hypothesis: Ho u >= 75 HA ll < 75 A sample of 30 items was taken from a large population. The sample mean was 72 and the population standard deviation was 7. What is the test statistic? (Round your answer to 2 decimal places.)

Answer 1

solution:

$\alpha$ = 0.05   

critical value =Z$\alpha$ = Z0.05 =-1.645 using z table

q4)

Test statistic = z

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

= (72 - 75) / 7 / $\sqrt$ 30

Test statistic =-2.35