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Probability & Statistics

05/14/14

I'm having trouble finding the right formula to use for this probability statistics question.

Aero company bids on two contracts. They feel they have a 40% probability of winning contract A. If they win the first contract, the probability of winnin ghe second is 70%. However, if they lose... more

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Probability & Statistics

05/04/14

what is the probability of the family having a certain sex child?

a family wants to have 3 kids, a) what is the probability they will have 1 boy? b)what is the probability they will have at least 2 boys? c)what is the probability that they will have 1 girl? d)... more

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Probability & Statistics Statistics

04/28/14

can we reject the null hypothesis?

You would like to know if people give different responses to white interviewers than to nonwhite interviewers. To explore this, you use the American National Election Studies 2008 data in order to... more

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Probability & Statistics

04/27/14

Alphabet game word problem

The alphabet game costs .25 to play. Before the game, 26 slips of paper, each with a different letter of the alphabet on it, are put into a bag. A player draws one slip from the bag. If the player... more

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Probability & Statistics Probability

04/20/14

three students A,Band c are in a swiming race ,AandB have the same probability of winning and each is twice as likely to win as C

a- what is the probability that A does not win ? b- what is the probability that Bor C wins ?

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Probability & Statistics

04/02/14

probability

A basketball player makes a successful free throw 86% of the time. Using the Normal approximation to the binomial, estimate the probability that he makes between 30 and 40 successful shots in 50... more

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Probability & Statistics

03/25/14

Probability

The amount of milk sold each day by a grocery store varies according to the normal distribution with mean 130 gallons and standrd deviation 12 gallons. On a randomly selected day, the probability... more

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Probability & Statistics

03/25/14

Probability Question

Many random number generators allow users to specify the range of the random numbers to be produced. Suppose that you specify that the rndom number Y can take any value between 0 and 2. Then the... more

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Probability & Statistics Statistics Statistical Method Time Series

03/12/14

Yule-Walker equations

Problem . Show that the Yule-Walker equations hold even when we do not assume c=0.?

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Probability & Statistics

03/10/14

After a movie premiere , 99 of the first130 people surveyed said they liked the movie.

- what is the experienmantal probability that the next person surveyed will say she liked the movie? - what is the experimental probability that the next person surveyed will say she did not liked... more

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Probability & Statistics

02/19/14

probabiliy question . help

5% of the population has X disease. A screening test accurately detects the disease for 80% of the people who actually do have it. The test also incorrectly indicates the disease for 30% of the... more

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Probability & Statistics

02/19/14

monty hall problem with 4 doors

Explain the Monty Hall problem in the case of 4 doors computing specific probabilities.

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Probability & Statistics

02/13/14

what is the mean, standard dev. and mean absolute deviation of the number of units you expect to be able to sell

It costs $20,000,000 to build a factory to produce up to 250,000 widgets per year. The unit cost of producing one widget is $5000. You can sell widgets for $10,000 each. The probability that you... more

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Probability & Statistics

02/08/14

If A and B are independent event, show that the following pairs of events are also independent. (a) A and B' (b) A'and B'

where A' is the complement of A and B' is the complement of B

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Probability & Statistics

02/04/14

When selecting two people, find the probability that one works in an office and the other one drives a car?

I have a probability question from my intro to stats class. I can't figure out if it's dependent or independent. Overall, I really don't know how to figure it out. There are 2000 people in total... more

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Probability & Statistics

12/22/13

The slope and the y-intercept

Find the slope and the y-intercept for the line that passes through (-8,2) (11,4) The slope is= The y-intercept is = d. Find the slope and the y-intercept for the line that passes through... more

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Probability & Statistics

12/21/13

Method of least squares

A magazine reported on a study of the reliability of a commercial kit to test for arsenic in groundwater. The field kit was used to test a sample of 20 groundwater wells in a country. In addition... more

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Probability & Statistics

12/18/13

Probability & Statistics

Find the slope and the y-intercept for the line that passes through (-6,1) (4,2)The slope is= The y-intercept is =d. Find the slope and the y-intercept for the line that passes through (-8,-4)... more

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Probability & Statistics

12/18/13

Probability & Statistics

A magazine reported on a study of the reliability of a commercial kit to test for arsenic in groundwater. The field kit was used to test a sample of 20 groundwater wells in a country. In addition... more

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