What Happened If You Didn't Take The College Entrance Examination? I Recommend

It is the last key step, which is used to judge whether the difference between samples and samples, and between samples and the whole is caused by sampling error or essential difference.

As for the fourth question, hypothesis testing and statistical inference are actually completed together. It may be that Su Changqing is afraid that Lu Shixian may be unclear about this when he comes into contact with it for the first time, so he separates it for his understanding.

This step is relatively rigid. First, a null hypothesis h0 is proposed for the overall research: crayfish have a positive effect on the growth of the total amount of reducing substances in the rice field.

and the alternative hypothesis h1 which is diametrically opposed to the null hypothesis.

Since the sample conforms to a normal distribution, and the overall variance is unknown and the sample size is small, a t-test was performed.

h0: μ=μ0=3346 g/kg

h1: μ≠μ0

α=005

The test calculated t=1956

Query the t value distribution table t

Therefore, h0 cannot be denied, and the difference is considered not significant, so it is judged that crayfish has a positive effect on the growth of reducing substances in rice fields.

For the remaining dependent variables, active reducing substances, fe2+, n2+ and the content of active organic reducing substances, etc., just follow this step in order.

At this point, if he only wants to prove that crayfish can promote reducing substances in rice fields, this hypothesis test is over.

After seeing so many steps, do you think it is very complicated and difficult?

In fact, using spss data analysis software for statistical analysis and preparing data in advance, it only takes less than a minute if you are quick

But Lu Shixian has software, hey, just play!

It's been a long time since I played this game, and his hands were raw.

Some couldn't help showing a wave of operations.

Finally, Lu Shixian wrote the results of the experiment completely in the notebook according to the order of the topics.

mission completed.

Lu Shixian snapped his fingers, ready to hand in homework.

For this reason, he had to complain about why he couldn't go through the mailbox, which made him look for Su Changqing three times before he found someone.

It has been so long since the question was written, Su Changqing originally thought that Lu Shixian had given up on these questions, and he didn't care, it was just a playful play.

But he didn't expect Lu Shixian to come.

It's a bit busy, but it's okay to have a look.

He took the manuscript paper and began to browse his experiments.

The moment Su Changqing saw the experimental design, his eyes lit up.

Seems like studying the effects of animals on plants?

This direction is good!

It's just that one is crops and the other is economic animals, which seems to be a bit biased towards agronomy.

However, animals and plants are the research areas of biology, so there is nothing wrong with it.

It took Su Changqing a few minutes to read the results of Lu Shixian's hard work for nearly a month.

Afterwards, he nodded to Lu Shixian and said, "Although your experimental design still has many flaws, the basic experimental principles are guaranteed, which is very good!"

"However, your choice of topic is really interesting. If there is no problem with your experimental data, it can indeed be concluded that crayfish have a positive impact on rice fields."

As he said that, Su Changqing suddenly thought of something, and then looked at the manuscript paper over and over again, and he couldn't put it down.

"The issue of agriculture, rural areas and rural areas has been an area of ​​great concern to the country recently. Your research found that it is very likely to change the pattern of rice cultivation in the south, not bad!"

"If the demonstration is successful, and based on this, an inherently replicable and spreadable rice-shrimp co-cultivation model can be developed, which can help farmers increase production and income. This is a very valuable research result."

After speaking, he had some doubts.

"However, the negative impact of crayfish on rice fields is still unknown. If the field management is not in place, it is very likely to cause the opposite result. This is a double-edged sword!"

"But generally speaking, the flaws do not conceal the advantages, which is very good!"

I don't know how many good words came out of his mouth.

At this time, Lu Shixian couldn't help but secretly gave him a thumbs up.

Unlike the bricks called beasts who sell sheep's tricks, the real professors and scholars are cows.

Even if the main field of research is not very close to this area, the accumulated knowledge is there, and the vision of looking at problems is really vicious.

Directly draw inferences from one hand, and see the positive and negative impacts produced.

Lu Shixian smiled and asked, "Professor Su, is my homework finished?"

Su Changqing looked at him in confusion as if he had lost his memory.

"What is done? You are still far behind."

Lu Shixian suddenly looked sad and angry, and looked at Professor Su in front of him in disbelief.

"How can the head of a dignified hospital lie to children?"

Su Changqing coughed lightly without changing his face.

"Go down and turn left, ask anyone at random, who in the science department can't write papers?"

Lu Shixian is about to cry, who doesn't know that your office downstairs is full of your migrant workers?

Isn't this fetching water from a bamboo basket—isn't it a waste of effort?

Su Changqing looked at his expression and smiled sweetly.

"I'm doing it for you too."

"Your achievement, if you don't publish a paper, it's a waste of money!" No one else can think of it. "

"You write well. I'll take a look at it for you after you finish writing it. I'll see if I can post it later. When you go to Yanda University, you can pat your chest and say that you are from Jinling!"

The reluctance is naturally false, Lu Shixian has long had the intention to write a thesis.

It's just that Dean Su can do whatever he says, so he has to be arrogant and express his protest.

So, he was about to embark on the same path as Liu Xianhua.

I don't know how long he kept his black and thick hair?

Lu Shixian was very worried about this.

There is no need to stay at Jinling University for the rest of the time.

Writing a thesis is hard work, even if he has rich experience, even if he has a well-thought-out plan.

It is also impossible to complete the first draft within a few days. There are many details involved, so it is inconvenient to say more.

Returning to the classroom of No. 1 Middle School again, the sign of Class 1 (Senior Grade 2) has been hung outside.

He suddenly realized that he was already a sophomore in high school.

Sure enough, time is not forgiving!

After saying hello to the students in the class, while sighing, Lu Shixian sat in the last row of seats.

Looking around for a while, there was a slight change in the personnel of the first class at this time.

To his relief, there were no students who were left behind and transferred to ordinary classes.

Because several girls have already transferred to the liberal arts class, and several top students from other classes have joined this new family.

So the total number of people is not much different.

It turned out that the old classmates in the first year of high school were not surprised by him, but the new classmates seemed very excited to see Lu Shixian.

Give him the most curious and admiring eyes frequently.

Obviously, the name of God Lu has already been deeply rooted in the hearts of the people even in ordinary classes.