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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.
36,755 Questions
Median of 5 is 5
Average of 5 is 5
Sum of 5 is 5
It's quite pointless to calculate properties of collection of numbers if it consists of only one number.
What are the different sources of error in surveying?
Personal errors
natural errors
instrumental errors
How is that the random sample gives a fairly accurate representation of public opinion?
The larger the sample, the greater the accuracy, but in every case, the sample must be truly random.
What are the odds of rolling a double two with 2 dice?
Each cube can land in 6 different ways.
The chance of a '2' on the first cube = 1/6 .
The chance of a '2' on the second cube = 1/6 .
The chance of both of them on the same roll = (1/6) x (1/6) = 1/36 = 2 7/9 percent
Is the median affected by the mean?
The median is the value which seperates the upper and lower half of a set of numbers.
The mean is the average value between two or more numbers.
In calculating a set of numbers, specifically a set of averages, the median may indeed be effected by the mean.
Notice that 63 is a multiple of 9 and 81 (which is close to 82) is a multiple of 9. This gives a decent approximation to 63/82. More specifically, 63/82 is approximately 7/9, or 0.7778.
If you flip a coin 10 times what is the posability that the coin will land on heads?
The probability that the coin will land on heads each time is 1/2. (1/2) to the tenth power is 1/1024. This is the probability that the coin will not land on heads. Subtract it from one to get the probability that it will : 1-(1/1024)
There is a 1023/1024 or about 99.90234% chance that the coin will land on heads at least once.
(There is a 1/1024 chance that the coin will land on heads all four times.)
Which group of sets does the number 1 belong to?
There are infinite number of sets:
Integers, positive integers, rationals, reals, {1,2,3}, {1, 2.35, sqrt(-7), -one quintillion}
Numbers that are neither prime nor composite.
Multiplicative identities in mathematical groups.
Numbers whose name, in English, begins with the letter O.
How do you find median of even amount of numbers?
You take the two middle numbers and find their mean.
for example:
if you have the numbers:
4, 7, 16, 23, 27, 29, 34, 45
Then take the two middle numbers ( which in this case are 23 and 27).
Add them together 23+ 27= 50
Finally, you divide the sum by 2: 50\2= 25
Then, there's your answer.
Who is Dr Fred Whipple and explain his hypothesis?
Whipple came up with the "dirty snowball" concept of comets; that the head of the comet is primarily ice and frozen gasses bound together by dust, gravel and rocks. This explains the nature of the "tail" of the comet; as the frozen gasses sublimate away (change from solid to gas, without an intervening liquid state) the gas is carried away by the solar wind and by pressure of the sunlight itself.
If the size of the sample is increased the standard error?
If I have understood this very poorly worded question correctly, the answer is that the standard error may decrease. It cannot increase but it is possible that it does not decrease.
Which method can be used to find the interquartile range for a set of data?
To find the interquartile range (IQR) of a data set, first, arrange the data in ascending order. Then, identify the first quartile (Q1), which is the median of the lower half of the data, and the third quartile (Q3), which is the median of the upper half. The IQR is calculated by subtracting Q1 from Q3 (IQR = Q3 - Q1), providing a measure of the spread of the middle 50% of the data.
