05/01/21

GOOD EXPLANATION NEEDED (HELP NEEDED)
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09/10/20

Angle 1 is a supplement of angle 2, and m angle 1 is 123 degrees. Angle 2 is a complement of angle 3. Find m angle 3.
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07/14/20

Distribution of p-hat
Suppose that 60% of all students currently enrolled at all California Community College campuses combined are female. Researchers want to do a survey, and randomly select 1000 students who are... more
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07/14/20

Evaluate the limit, using L'Hopital's Rule if necessary
lim ex^2/1-x3 x-->infinity
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03/29/20

pivotal quantities - mathematical statistics

What is a pivotal quantity that can be used to find an exact/nonasymptotic interval for μ when σ is unknown? What distribution does it follow? Make sure that your answer is different from the... more
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03/29/20

normal distribution statistics question
A manufacturer knows that their items have a normally distributed length, with a mean of 14.8 inches, and standard deviation of 0.9 inches.If 16 items are chosen at random, what is the probability... more
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01/07/20

The sum of two numbers is 57 and the difference is 19. What are the numbers?
What is the largest and smallest number.Please help.
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12/02/19

Probability density function

p(Y=y) = p(1-p)^(y-1) (Given y=1,2,3,.... and 0<=p<=1 )verify the above is a probability density function
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10/30/19

One way ANOVA - calculate degrees of freedom error
There are 6 participants tested with differnt 6 medicines with enought time between. Medicine is factor in the one way anova. The formulae given to me was n-i*j. I tried to plug it in several... more
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10/29/19

A jar contains 10 nickles and 5 dimes. Let X be the value of a coin drawn at random from this jar. Assuming all coins have the same probability to be drawn, find E(X) and Var(X).
I understand how to find E(X) but not how to find Var(X).
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10/28/19

geometric sequence

find the missing term in this geometric sequence:13,___,208
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10/28/19

Help Me Pleaseeeeeee
How many even 4-digit numbers can be formed from the digits 4, 5, 6, 7, and 9 with no repetitions allowed? (Hint: Try filling the units place first.) A red six-sided die and a green six-sided... more
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10/27/19

Statistic Question for Econometrics
Hi! I am working on an econometrics midterm review, and I had a question. If I have to do a mean left tail hypothesis testing and build the confidence interval at 95%, would the confidence interval... more
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10/27/19

Needs to be done today help
The average monthly mortgage payment including principal and interest is $982 in the United States. If the standard deviation is approximately $180 and the mortgage payments are approximately... more
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10/25/19

HELP! STAT REVIEW QUESTIONS
1) Forty percent of the english students at Parkway High school had Dr.Mima for history, and the rest had Dr. P. Thirty percent of Dr.Mima's students earn an A in probability, while only ten... more
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10/23/19

Bayes Theorem to calculate probability
Suppose that you are an art dealer for Van Gogh paintings. Whenever someone brings in a painting that they claim is from Van Gogh, you send in the painting for pigment analysis. Pigment analysis... more
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10/19/19

A single die is rolled 15 times. What is the probability that a six is rolled exactly once, if it is known that at least one six is rolled?
I did 1-(5/6)^15 and got 0.9351 but it says I am wrong. What should I do?
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10/10/19

You have 4 quarters and 2 dimes in your pocket. You draw two out at random. What is the expected value of the coins in cents that you draw
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10/09/19

Finding % from a standard deviation problem
The average score on SAT math was 500 with a standard deviation of 100. What is the % of persons having math scores between 500 & 650
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10/09/19

Method of moments estimation
If Y1, Y2,.....,Yn constitute a random sample from the pdf f(y;ø)=(2/ø²)(ø-y), .......0Find and estimator of ø by using the method of moments
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09/22/19

Find the probability that at least two operating rooms are used.
The following data were collected by counting the number of operating rooms in use at Tampa General Hospital over a 20-day period: On four of the days only one operating room was used, on six of... more
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09/18/19

math probability word problem
11. Mr. Wu’s biology class is writing group reports aboutthe Hawaiian Islands. He has a total of 10 groups.Mr. Wu will assign an island and a topic at randomto each of the groups. No two group... more
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08/19/19

Combine the radicals, I wasn't sure what to do with the √7, or how to simplify it, i need a brief explanation
Combine the radicals4√7+3√28
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07/22/19

A salesperson estimates that 30% of people make a purchase. Determine the probability distribution for the possible number of sales made for the first five people who enter the store.
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07/16/19

What's the difference between Rao-Blackwell Theorem and Lehmann-Scheff Theorem?
I know that the Rao-Blackwell theorem states that an unbiased estimator given a sufficient statistic will yield the best unbiased estimator. Is the only difference between Lehmann-Scheff and... more
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