11/05/19

uppose a test for a disease has a sensitivity of 90% and a specificity of 95%. Further suppose that in a certain country with a population of 1,000,000, 19% of the population has the disease.
Suppose a test for a disease has a sensitivity of 90% and a specificity of 95%. Further suppose that in a certain country with a population of 1,000,000, 19% of the population has the disease.Fill... more
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11/05/19

Find the sample space. Then find the indicayed probability (dunno what indicated probability is).
Alana tosses 2 nimber cubes (dice). She wins if she rolls double sixes. Find P(Alana wins).
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11/05/19

Introduction to Statistics
The mean upload speed for a particular Internet provider is 500 KBps with a standard deviation of 60KBps. Use Chebyshev's Theorem to estimate the percentage of customers who should be able to... more
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11/05/19

Introduction to Statistics
The mean cost of individual health care insurance in one region of the country is $421 per month with a standard deviation of $78. Of those in the region who have individual health insurance, ... more
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11/04/19

The probability it will rain is 40% for the next 3 days. Find the probability it will not rain at least one of the 3 days.
Probability question about independent events
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11/03/19

URGENTLY need help please with Statistics question

A long history of testing water samples in a certain lake has shown that the level of a certain pollutant is approximately normally distributed with standard deviation 4.6 mg/L. What is the minimum... more
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10/28/19

At a local college, 164 if the male students are smokers, and 246 are non-smokers. Of the female students, 90 are smokers and 210 are non-smokers.

A male student and a female student from the college was randomly selected for a survey. What is the probability that both are non-smokers?
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10/26/19

Graduate Statistics
Does computer-assisted instruction help community college health science students with reading difficulties to learn reading skills at a faster than normal rate? A researcher arranged for one of... more
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10/26/19

Graduate Statictics
Do college students from private schools have higher than average test-taking skills? A researcher administered a standard measure of test-taking skills to a randomly chosen student from a private... more
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10/23/19

Let f(x) = xe^x
Find f '(x), f "(x), and f "'(x). Based on your results, find a general formula for f^n (x).
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10/23/19

A variable, x, is uniformly distributed between 0 and 3,600. In a random sample of n = 60, if x̄ represents the variable's sample mean, what is E(x̄)?
A variable, x, is uniformly distributed between 0 and 3,600. In a random sample of n = 60, if x̄ represents the variable's sample mean, what is E(x̄)?I am having trouble understanding what the... more
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10/23/19

statistics probability

Let X have a uniform distribution on the interval (5, 14). Find the probability that the sum of 2 independent observations of X is greater than 22.
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10/22/19

, a student goes to school by bus

, a student goes to school by bus on Monday and Tuesday, by train on Wednesday, and by light bus on Thursday and Friday. The probabilities that the student is late to school if he travels by bus,... more
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10/22/19

A Dish TV satellite dish is the shape of a paraboloid. The dish is 42 inches wide, and 10 inches deep. How many inches should the receiver be located from the vertex for optimal reception?

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10/21/19

Combinations to form a team
A college is looking to form a team of 8 to participate in a coding competition. The team needs at least 2 females and 2 males. If there are 4 males and 7 females who want to join the competition,... more
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10/21/19

Find the factors and the zeros of the polynomial function: P(x)=x^3+x^2-10x+8
I need help with! If you can, please explain step by step. THank you!
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10/21/19

Calculate ∑ (-1)^k (k^2), for k = 0,1,2,3 and 4.
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10/21/19

Suppose that scores on a test are normally distributed with a mean of 80 and a standard deviation of 8...
a) What is the 90th Percentile?b) What percentage of students score less than 90?Questions given in my Stat Methods course. I had easily finished my homework over Z-scores, density curves, etc but... more
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10/20/19

What is the probability that a randomly selected thermometer reads?
Please use the NDT table to answer the following question:Readings on a thermometer are normally distributed with a mean of 0C° and a standard deviation of 1.00.What is the probability that a... more
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10/18/19

Application of Logs
The radioactive isotope has a half-life of 7.5 minutes. How long will it take or a sample to decay so that 64% of its original mass remains?
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10/17/19

Assume that you draw a card from a standard deck.
Assume that you draw ONE card from a standard deck. Find the probability of drawing a heart GIVEN that you drew a face card (J,Q,K),
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10/17/19

Find the z score such that the area under the standard normal curve to the left is 0.42
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10/17/19

arithmetic sequence

find a formula for the nth term of the arithmetic sequence first term: 2.5 common difference: -0.2
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10/17/19

I don't understand how to write the equations.

A parabola can be drawn given a focus of (7,6) and a directrix of y=8. Write the equation of the parabola in any form.
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10/17/19

write as equation and solve
alex is five times as old as jim, but in twelve years he will only be three time as old. how old is each now.
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