A sample of 1700 computer chips revealed that 73% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature claimed that more than 70% do not fail in the first 1000 hours of their use. Is there sufficient evidence at the 0.05 level to support the company's claim?

Solution :

It is a left tailed test.

Given : n = 1700

α = 0.05

We want to test,

the null hypothesis,  

the alternate hypothesis,

Test statistics is

Thus z - critical value = 1.64

Since, z calculated  -----  z-critical value

             (2.70)                          (1.64)

Thus we reject the null hypothesis.

So there is sufficient evidence at 0.05 level to support the company's claim that more the 70% do not fail in the first 1000 hours of their use.

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign

5+2x=a

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