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STATISTICS AND PROBABILITY
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DATA DISTRIBUTIONS
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Data distributions Answers
Data distributions
asked 2021-03-11
What is the difference between a normal profile of a random variable and normal pdf of a random variable.
Data distributions
asked 2021-03-07
We have a set of n-elements (A), and a set of m-elements (B).
\(\displaystyle{n}\ge{0}\)
\(\displaystyle{m}\ge{0}\)
Find how many relations there're from A to B.
Data distributions
asked 2021-03-01
A yoga class consists of 90 males and 110 females. What is the ratio of male to female students?
Data distributions
asked 2021-02-25
5 building's height's
\(\displaystyle\mu={56}\)
m. Three of them are 58m, 55m and 53m. What is the mu for the 2 remaining buildings?
Data distributions
asked 2021-02-25
List all of the elements of
\(\displaystyle{\left\lbrace{I},{J},{K}\right\rbrace}\times{\left\lbrace{Q},{R}\right\rbrace}.\)
Data distributions
asked 2021-02-24
Consider the rates of children (under 18 years of age) living in New York with grandparents as their primary caretakers. A sample of 13 New York counties yielded the following percentages of children under 18 living with grandparents.
5.9, 4.0, 5.7, 5.1, 4.1, 4.4, 6.5, 4.4, 5.8, 5.1, 6.1, 4.5, 4.9
a) Obtain and interpret the quartiles.
b) Determine and interpret the interquartile range.
c) Find and interpret the five-number summary
Data distributions
asked 2021-02-23
A set of test papers was machine scored. Later it was discovered that two points should be added to each score. Student A said, "The mean score should also be increased by two points." Student B added, "The standard deviation should also be increased by two points." Who is right? Justify your answer.
Data distributions
asked 2021-02-13
The data for each grade have the same interquartile range (IQR). Which of the following best compares the two best score distributions?
With reference to line plots the data for Sixth grade geography test score is
7 8 8 9 9 9 9 9 10 10 10 11 11 11 12 12 12 14 14 15
The data of seventh grade geography test score is
7 10 10 11 11 11 11 12 12 13 13 13 13 13 14 14 14 15 16 17
Data distributions
asked 2021-02-03
If we add a constant (say, d) for all data values, how this will affect the geometric mean? Give an example.
Data distributions
asked 2021-01-22
A county is populated with 20,899,000 people, while the population is growing at a rate of 3.2% per year. What will the population be in 19 years? Round the answer to the nearest thousand.
Data distributions
asked 2021-01-17
Jack has collected money for a buisness start up from different sources:
1st. $56,500.
2nd. $38,000.
3rd. $128,000.
4th. $22,500.
a) Find the total amount collected.
b) Detirmine the percentage of each source's money from the total amount. Translate into degrees for a pie chart.
Data distributions
asked 2021-01-08
You have 11 cubes in 8 different colors (1 color repeats 2 times and another one repeats 3 times) that you want to build in a line. How many different lines can be formed with those cubes?
Data distributions
asked 2021-01-07
What do the mean deviation, variance and standard deviation all have in common? How is this common factor (s) helpful with the calculations of the mean deviation, variance and standard deviation?
Data distributions
asked 2021-01-04
Annual sales, in millions of dollars, for 21 pharmaceutical companies follow.
8408 1374 1872 8879 2459 11413
608 14138 6452 1850 2818 1356
10498 7478 4019 4341 739 2127
3653 5794 8305
a. Provide a five-number summary.
b. Compute the lower and upper limits.
c. Do the data contain any outliers?
Data distributions
asked 2021-01-02
Explain why the tandart deviation would likely not be reliable measure of variability for a distribution of data that includes at least one extreme outlier.
Data distributions
asked 2020-12-24
\(\displaystyle\mu={50},\sigma={10}\)
Is the range be approximately 60 if it's normal distribution?
Data distributions
asked 2020-12-24
According to Census data, 1950 the population of the U.S amounted to 151.3 million persons, and 13.4% of them were living in the West. In 2000, the population was 281.4 million, and 22.5% of them were living in the West. Is the difference in percentages practically significant? statistically significant? Or do these questions makes sense? Explain briefly.
Data distributions
asked 2020-12-09
There're 5.2 liters of blood in an average person's system. Assume, that the variable is normally distributed. The standard deviation is 0.3. What is the percentage of people with less than 5.4 liters in their system?
Data distributions
asked 2020-12-06
P({1, 2, 5, 9})
|S|=3
List all of the elements that conatain 3 elements.
Data distributions
asked 2020-11-30
What does it mean for a sample to have a standard deviation of zero? Describe the scores in such a sample?
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