R

09/09/19

How to reorder data.table columns (without copying)?
I'd like to reorder columns in my `data.table` `x`, given a character vector of column names, `neworder`: library(data.table) x <- data.table(a = 1:3, b = 3:1, c = runif(3)) neworder... more
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R

08/24/19

How to increase font size in a plot in R?
I am confused. What is the right way to increase font size of text in the title, labels and other places of a plot? For example x <- rnorm(100) hist(x, xlim=range(x), xlab= "Variable... more
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08/22/19

What is -3.1p+ 2(4.3p - 8.8)
What is this answer to -3.1p+ 2(4.3p - 8.8)
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08/21/19

If all the elements of set A are also elements of set​ B, then set A is​ a(n) _____ set of b
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08/21/19

In each part, let θ be an acute angle of a right triangle. Express the remaining five trigonometric functions in terms of a. Sin θ = a/3 find cos tan cot csc sec
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08/06/19

I need to figure out whether it is left, right, or a two tailed test and the test statistic along with H to the o and H to the a
An employment information service claims the mean annual pay for​ full-time male workers over age 25 without a high school diploma is ​$22,300. The annual pay for a random sample of 10 ​full-time... more
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08/01/19

statistics help needed
"Zero percent financing" means the obvious thing—that no interest is being charged on the loan. So if we borrow $1200 at 0% interest and pay it off over 12 months, our monthly payment will... more
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07/30/19

Do the data provide sufficient evidence that a greater proportion of those with a college education are satisfied in their work?
The table shows the number satisfied in their work in a sample of working adults with a college education and in a sample of working adults without a college education. Assume that you plan to use... more
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07/26/19

Sampling Distributions
In a recent year, the Better Business Bureau settled 75% of complaints they received. (Source: USA Today, March 2, 2009) You have been hired by the Bureau to investigate complaints this year... more
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04/19/19

not sure how to formulate this

In the US the percentage of adults who have had an appendectomy is 28%. A simple random sample of 42 adults and the US is taken. Calculate the probability of the proportion of adults who have had... more
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03/02/19

Need help answering this question
The serial number on a new twenty-dollar bill consists of two letters followed by nine digits and then a letter. How many different serial numbers are possible, given the following conditions?(a)... more
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02/27/19

A certain forest covers an area of 3500km^2
A certain forest covers an area of 3500km2. Suppose that each year this area decreases by 8.75%. What will the area be after 8 years? Round your answer to the nearest square kilometer.
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01/28/19

A race car driver won a 900 mile race with a speed of 109.2 miles per hour. Find the drivers time.
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01/23/19

One positive integer is 5 less than twice another. The sum of their squares is 725. Find the integers.
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01/16/19

suppse joe and frank have the same amount of money how much must joe give frank so that frank has $10 more than joe
suppse joe and frank have the same amount of money how much must joe give frank so that frank has $10 more than joe
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09/28/18

If x is an acute angle and tanx+cotx=2,findthe value of tan^6x+cot^6x
Mathematics-trigononetry  
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07/14/18

If sin(x+y) /sin(x-y) = a+b / a-b then what is tanx /tany equals to?
It is asked from me in the nda examination. 
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