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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

A six-sided number cube is rolled three times. What is the probability of rolling a 4 all three times?

Assuming the die is a standard die with a different number from the set {1, 2, 3, 4, 5, 6} on each side, then:

Probability_of_success = number_of_ways_of_success/total_number_of_outcomes

There is only 1 way to roll a 4 and there are 6 possible outcomes, therefore the probability of rolling a 4 is 1/6

The die has no knowledge of previous rolls; each roll is independent, thus:

The probability of three fours is a row is the probability of a 4 times the probability of a 4 times the probability of a 4, which is:

Probability = 1/6 × 1/6 × 1/6 = 1/216

Name a type of test you can't study for?

A type of test you can't study for is an IQ test, as it measures innate cognitive abilities rather than learned knowledge. These tests assess skills such as problem-solving, logical reasoning, and pattern recognition, which are typically stable traits rather than acquired skills. While some familiarity with the test format may help, the core abilities measured are not subject to study or preparation.

If group a has a higher mean than group b the research hypothesis is directional or non directional?

Whether your alternate hypothesis is directional (one-sided) or non-directional (two-sided) is largely up to you but must be determined before you conduct your experiment, not after. It's not defined by the outcome.

Define internal validity?

Internal validity is higher when you stop confounding variables interfering with the experiment (things that effect the results). Internal validity occurs when a researcher controls all confounding variables and the only variable influencing the results of a study is the one being manipulated by the researcher. This means that the variable the researcher intended to study is indeed the one affecting the results and not something else.

What is the area along the bottom of a chart that identifies the categories of data?

If you mean the box that lists the meanings and values of all the various colors, symbols, letters, etc. found on the entirety of the chart, it's called the legend. If you mean, specifically, the line that runs from left to right across the chart, a line used in many but not all types of charts, it's called the abscissa. That term is rarely used, though. It is most often called the x-axis or the category axis.

What is the answer to the equation x minus two thirds equals five?

Answer

khgghjm srwetxergxdtrg resd ftrtd rtdgvft uegwygrheruhtuywehjygtr ytrerjrjhj jurjgrakjrkhfuhiternt,srjtist

x-2/3=5

x=5 2/3?

What does 'dactylic' mean?

Dactylic is the adjectival form of the noun dactyl. A dactyl is a metrical foot that has a strong syllable followed by two weak ones: strong weak weak.

The word "certainly" has that metrical beat: 'CER-tuhn- ly. Dactylic lines move the reader, speaker, and listener along in a kind of march or trot. Too many dactylic lines in a pattern that is too regular will become a foolish sing-song: 'Dactyls will 'urge you to 'move in a 'march,

'Following 'beats as you 'walk.

'Spondees re'tard you, and 'anapests 'skip,

'Lending a 'lilt to your 'talk.

'Iambs will 'stroll with un'usual 'ease,

'Loping from 'pillar to 'post.

But 'dactyls are 'happy and 'cheerful and 'light,

So 'they are the 'ones I like 'most.

What is a polygragh?

poly graph means an instrument for the simultaneous

Is mean when you add all numbers and then divide them?

no. it actually means that you add all the numbers together and your answer is the mean

Compare and contrast mode mean and median?

Mean = average formed by adding values together and dividing by the total number of values

Mode = the most popular value

Median = line up all values in order and take the middle value

Are the keys on a piano considered to be a continuous variable?

No.

There are 88 keys on a piano keyboard. A continuous variable can assume an uncountable (infinite) number of values in such a way that between any two values there are always infinitely more.