Question

A certain machine part manufactured in millions is to withstand a pressure of 100 units. The variability measured by standard deviation on the basis of thousands of parts was found to be 20 units. A random sample of size 400 was taken and the result of testing the machine parts showed that the average strength was 96.9 units. Test the hypothesis that the machine parts have an average strength of 100 units. State clearly the statistical hypothesis with which you have started and any basic theorem on sampling distribution that you have used.

Answer 1

Answer:

please mark me to be

Explanation:

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Answer 2

Answer:

Here OP bisect ∠BOC

∴∠POC=∠BOP …………(i)

and OQ bisect ∠AOC

∴∠AOQ=∠COQ …………….(ii)

and ∠AOB=180

o

[∵AOB is a straight line]

⇒∠BOP+∠DOC+∠COQ+∠AOQ=180

o

⇒∠POC+∠POC+∠COQ+∠COQ=180

o

[using (i) & (ii)]

⇒2∠POC+2∠COQ=480

o

⇒2(∠POC+∠COQ)=180

o

⇒2∠POQ=180

o

⇒∠POQ=90

o

.