803 Answered Questions for the topic Probability & Statistics

Probability & Statistics

06/11/14

Over the past few years, banks have strongly promoted online banking and the paying of bills online.stat
In 2003, about 50% of internet usr paid bills online.  In a recent survey of 250 internet users, 150 said that they pay bills online.  At the 5% level of significance, test whether the proportion... more
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Probability & Statistics

06/11/14

To decrease the amount of time it takes to deliver packages, a delivery company purchased computer software that finds the optimal route for making
deliveries based upon the input of the packages destinations.  In the past the average amount of time it took to come delivery was 9.4 hours with a standard deviation of 0.8 hours.  Since... more
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Probability & Statistics

06/09/14

A company sampled 40 of the springs that it manufactures for use in small engines and discovered that 20% of the springs
did not meet specifications.  Construct a 99% confidence interval for the population proportion of springs that do not meet specifications.
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Probability & Statistics

06/09/14

A sample of 400 bags of dog food which are advertised to contain twenty-five pounds had a mean content weight of 24.5
pounds with a standard deviation of 3 pounds.  Find a 95% confidence interval for the population mean content weight of the bags of dog food.
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Probability & Statistics

06/09/14

Based on a survey of over 10,000 households, the number of televisions in the home was recorded as given in the table below.
Based on the data, find the expected number of televisions in a home.   Televisions     Percentage 0                 10% 1                 15% 2                 25% 3                 20% 4  ... more
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Probability & Statistics

06/09/14

A car insurance company has recorded the number of claims for the past quarter by age and gender. The information is recorded below.
                      Male        Female Under 25         25           12 25-50              14            8 Over 50           12            9   If a claim is randomly selected, what is the... more
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Probability & Statistics Statistics Question

06/06/14

I have some data on religious affiliation and likelihood to cheat and I am in a debate with a friend about what can be concluded from this information.
Given the following information, what can we conclude.    Religious affiliation in the United States(Rounded)   Evangelical Protestant 26% Catholic                     24% Mainline Protestant... more
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Probability & Statistics Probability

06/05/14

Probability outcome and frequency question
The table shows the results of spinning a spinner several times. Outcome A B C D EFrequency 2 4 3 1 2 What is the experimental probability of spinning a C or a D? A. 4/5 B. 1/48 C. 1/3 D. 2/5
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Probability & Statistics

06/01/14

how high does a stock price have to be to put a company in the top 10%
the average stock price for companies making up the S&P 500 is $50, and the standard deviation is $10. assume that stock prices are normally distributed
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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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