Chapter 4

ha-ha?

Hear these two words, almost all people are a little not calm, what is hehe?

As a result, Zhuang Jianye's eyes began to be full of suspicion, especially Peng Chuan and master Cen, who said that this guy would not play Taiji.

If so, it's not very good.

Although the two were having a lot of trouble in the canteen, they didn't want to poke the matter to the factory leaders. Peng Chuan was a "black door" waiting for distribution. If they did, they would have to leave every minute.

As for master Cen, it's against the rules to find Peng Chuan, and he has selfish intentions. If he is known by the top, it doesn't mean that he bumps his head into the muzzle of the gun.

If not, how could the two people who had torn their faces find others to judge them? They would have gone to the factory leaders to complain.

But now a few new college students shirk from each other, and it's not easy to force them to the corner. Ha ha, it's strange that they have a good heart.

However, just when people thought that Zhuang Jianye was playing Taiji and kicking the ball back intact, he let out a sigh, and then flipped through several pages of manuscript, then frowned and asked, "does this sampling scheme use the constant test of statistical list in common mathematical statistics method?"

Peng Chuan, who was just thinking about Zhuang Jianye's shirking, was stunned at this, even though he reflected what Zhuang Jianye said.

Common methods of mathematical statistics is a Book of mathematical statistics compiled by the statistical group of Institute of mathematics, National Academy of Sciences. In addition to teaching general methods of mathematical statistics, it also has a lot of common statistical calculation lists.

Therefore, many units involved in statistics, sampling and other application operations use it as a reference book.

Although Peng Chuan is not engaged in this field, he has participated in the sampling inspection of the factory's products several times. He has seen people use the above constant calculation table, so he is not unfamiliar with it. However, he shakes his head and confidently goes back to: "the number of samples sampled is already the least. Naturally, it is the most cost-effective scheme. Where can we still use the inspection?"

"2000 batches, 33 samples, 0 scrap, are you sure it is the most cost-effective?" Zhuang Jianye looked at Peng Chuan and asked.

"Of course!" Peng Chuan's return is quite sharp.

The supporters around him also secretly nodded their heads. For 2000 batches, only 33 samples were selected, but the proportion was only 1.65% of the total. It was already a small sample, which could not be any smaller. It was the most cost-effective solution.

But Zhuang Jianye shook his head and turned his eyes to Peng Chuan: "if I were you, I would take this value into the derivation formula of sampling inspection. After all, this kind of rivet will be scrapped after inspection, so according to the cost of each rivet, 12 yuan, the failure rate is 2%, using t = n + (N-N) [1-L (P)], roughly calculated, the cost is almost 12000, are you sure Is the cost the least? "

When this number is counted, almost all the people around take a breath of cool air. The cost of light detection is 12000 yuan, which is not low. You should know that the salary is only tens of Yuan these days, and the cost of more than 10000 yuan is sky high.

"No, our workshop needs more than 10000 yuan for each inspection, which makes our workshop almost sell iron by smashing the pot." At this time, before Peng Chuan opened his mouth, the opposite master Cen began to complain. Then he looked eagerly at Zhuang Jianye: "little comrade, you have said that. Is there any way to reduce the inspection cost?"

Zhuang Jianye nodded: "yes, yes, I remember that the sampling statistics table in" common mathematical statistics method "is not very accurate. I can only give you a general reference."

"No problem, as long as the cost can be reduced, the reference is OK." When master Cen arrived, he agreed. Not only he but also other people were looking forward to it.

We should know that the cost of sampling inspection is not only in the sixth branch, but also in other branches and workshops. So they all stretch their necks and look at Zhuang Jianye. At the moment, Zhuang Jianye has already taken out the pen in his coat pocket and asked for a few pages of newspapers left by the canteen master. It's just the calculation above.

Soon a sampling and testing plan of 2000 batches, 165 samples and 7 unqualified quantities was written on one side of the newspaper. Then Zhuang Jianye enclosed the three numbers in brackets and brought them into the previous formula to get the number of 2486. He was relieved.

It should be this solution, that is, it takes into account the detection coverage, and keeps the cost to the minimum.

"Shouldn't the inspection rejection rate be 0, which is the best value? How can anything greater than 0 be the best? "

When Zhuang Jianye says the formula of sampling inspection, Peng Chuan's face is a little ugly. When Zhuang Jianye deduces the sampling plan and the final cost step by step according to the constant statistical table, his face is even whiter.

I can't help shaking my head in disbelief. Obviously, I have deep doubts about Zhuang Jianye's calculation. Not only he, but Peng Chuan's supporters all look at Zhuang Jianye in disbelief. The scrap rate is zero, the cost is tens of thousands, the scrap rate is seven, the sample is doubled, but the cost is only two thousand four times. How can it be possible?

"It seems reasonable to artificially set the number of scrap as 0, but it should also be combined with the actual situation. In this case, if the disqualification rate reaches 7%, the air force will accept it according to 10% of the output, so 0.02 divided by 0.07 equals 0.286. According to the constant sampling statistics table, the constant of this number should be 7, and so on, to calculate the number of samples..."Seeing that Peng Chuan and others were not annoyed because they had lost face, but with a hint of asking for advice in their doubts, Zhuang Jianye also pointed to the "push" in the newspaper and talked to the public about the calculation method of sampling data.

Of course, if these people don't understand, Zhuang Jianye doesn't know. Anyway, one can be sure that he doesn't understand a sentence, and that is master Cen.

Before the end of the talk, he started pointing to Peng Chuan's nose and yelling that he had harmed their whole workshop. He not only asked him to give an explanation, but also asked the factory leaders to judge.

This time, Mr. Cen, they are not pretending. With the theoretical data of Zhuang Jianye, they are also emboldened. Although there is no direct evidence that Peng Chuan's sampling data leads to a high waste rate in their workshop, the cost of more than 2000 is turned into more than 10000, which is a great sin. How can Mr. Cen let it go.

Peng Chuan is a knowledgeable person. Seeing Zhuang Jianye's strict deduction, he knew that he was pushed to his grandmother's house by mistake. Therefore, master Cen didn't resist his pulling. His mistake was wrong. He had nothing to say. What's more, there were so many people present that Peng Chuan couldn't do that shameless thing.

So he lowered his head and let master Cen pull out, but at this time, Zhuang Jianye stood up and asked master Cen, who was ready to leave, coldly: "master Cen, is the rivet mould in your workshop not up to standard?"