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Statistics

Statistics deals with collecting, organizing, and interpreting numerical data. An important aspect of statistics is the analysis of population characteristics inferred from sampling.

36,756 Questions

What is the importance of mathematics?

Hey!

I just laid down a laminate floor. The planks were sold in packs of 8 and covered a certain square area. I had to measure my room and work out what the total area was and how many packs I needed, allowing 1 extra pack for offcuts.

When I finished I only had a few planks left in one pack, just as I had calculated.

I could not have done that if I didn't understand maths. I could either guess or:-

I would have to call someone in (at extra expense)

I would have had to keep going to the depot, to get more timber and run the chance they would sell out, or change the color.

I would be left with too many packs left over and live with the waste or take them back. (extra journey, time, waste.)

You need maths in most aspects of modern living, without it you will get ripped off or left confused. Do try to learn and do the best you can.

What does skinjacking mean?

There is a book called "Everlost" by Neal Shusterman.

In that book, a girl named Allie, who is a spirit, can jump into a living person's body. In the book, it's basically possessing for a little bit. There maybe different definitions, but that is what it means in this book.

How many grams is in a decimeter?

Grams is a unit of mass, decimeters is a unit of length. You can't convert between the two.

How many whole numbers have exactly 4 digits?

9000 of them. All of the numbers 1 thru 9999 EXCEPT 1 thru 999. 9999 - 999 = 9000.

What is the difference between an actual type and declared type variable?

I believe a declared type is the type used when first declaring a variable.

And the actual type is the type that the variable is actually assigned, which

could be the declared type or any subtype of that type. So given

GeometricObject shape = new Triangle();

GeometricObject is the declared type and Triangle is the actual type. To

demonstrate this more clearly the following statements are all correct.

GeometricObject shape; // shape declared to be a GeometricObject

shape = new Triangle(); // actual type assigned = Triangle

shape = new Square(); // now shape refers to a Square object

This is the basis of polymorphism. It allows you to write methods which have

for parameters more general types but are able to handle subtypes differently.

This makes your code more general and reusable.

How many ways are there to create a 4 digit number using the digits 12468 if the digits can repeat?

Well, you simply say that in the 4-digit number, there are 4 spots for numbers. In each spot, you can use each number, so there are five possibilities of numbers for each slot. You could list them (1246, 1248, 1264, 1268, etc.) but there is a much easier way. You say that in each spot you can have five different instances of a number.

5 5 5 5

_ _ _ _

Therefore, you can multiply 5 by 5 by 5 by 5 (5^4 or 54) to get (5*5)=25. 25*5=125. 125*5=625. 625*5=3125. So, there are 3125 ways to create a four-digit number from the digits 1, 2, 4, 6,8, if they can repeat.

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Another contributor dissented:

Vorksholk was on exactly the right track, but got carried away and multiplied once too often.

54 = (5 x 5 x 5 x 5) = 625

What is an example of a startling fact or a surprise statistic?

A study in 2005 by Salary.com estimated that $760 billion worth of US workers' time was wasted on the job each year due to browsing the Internet instead of working.

Is a hypothesis tested by experimentation?

Not unless its tested by experimentation.

If its tested by experimentation.

And then if found to be true its no longer just a hypothesis.

And if found to be false it becomes an invalid hypothesis, which anyone in their right mind would withdraw as a hypothesis.

What ia nominal scale?

A nominal scale is a method of categorising observation according to a scheme which has no sense of any ordering of the categories. For example, colour of your can. You cannot say that red is more than black or silver, etc.

How many different 3-digit numbers less than 500 can be made using the digits 345 and 6 if the digits can be only used only once?

There are 2 possible digits for the first digit (3 or 4), leaving

3 possible digits for the second digit (5 and 6 and whichever was not chosen for the first), leaving

2 possible digits for the third.

Thus there are 2 × 3 × 2 = 12 possible 3 digit numbers.

What is Two-way ANOVA (surface)?

In a two-way ANOVA on the surface, the relate in an equation the total variation, , where i=1,2,…,a and j=1,2,…,b; the explained variation by the "treatment" or first factor is , the explained variation by the "block" or second factor is and the unexplained variation .

SST= SSA+SSB +SSE

Degrees of freedom N-1 a-1 b-1 (a-1)(b-1) N=ab

What happens when one mistakenly implies causality where only a correlation between two variables exists?

In scientific circles this would usually lead to embarrassment because most people in such company hearing such a claim would quickly discredit it.

In groups where such claims are accepted they lead to further unproven assertions and possible falsehoods some of which will probably be absurd.

Why does adding or subtracting a constant amount to each value in a data set increase the mean?

The adding and subtracting a constant amount means the value will go up. The amount will go up due to the amount been added to each number.

What is a stem and leaf plot that shows two sets of data?

A back-to-back stem and leaf plot.

A back-to-back stem and leaf plot.

A back-to-back stem and leaf plot.

A back-to-back stem and leaf plot.

Why is removing all the outliers important?

Removing outliers is important because they can significantly skew statistical analyses and lead to misleading interpretations of data. Outliers may indicate errors in data collection or unique variations that are not representative of the overall population. By eliminating these extreme values, analysts can achieve a more accurate understanding of trends and relationships within the data, ensuring better decision-making and predictions. However, it's also crucial to carefully assess whether outliers are genuine anomalies or meaningful variations before removal.

What is law of large numbers?

when a probability experiment is repeated a large number of times, the relative frequency probability of an outcome will approach its theoretical probability.