945 Answered Questions for the topic Statistics Question

Statistics Question Probability & Statistics

06/30/15

please help!
In a recent survey, 15 people preferred milk, 27 people preferred coffee and 18 peoplepreferred juice as their primary drink for breakfast. If a person is selected at random, find theprobability... more
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Statistics Question

06/30/15

Please help!!!
The probability that sue will live on campus and buy a new car is 0.34. If the probability that she will live on campus is 0.53, find the probability that she will buy a new car, given that she... more
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Statistics Question

06/30/15

A box contains 24 syringes, 4 of which are defective. If 4 are used, then what is the probability that at least one syringe is defective?
Not sure how to do probability problems so I need help with them!
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Statistics Question

06/13/15

type I & Type II Erros
Please consider the following statement: “If the decision is to reject a null hypothesis, then we have certainty that the null hypothesis is false.” Please indicate whether this statement is true... more
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06/12/15

Probability, Random Variables
Four red cards and four green cards are well shuffled. Cards are drawn, without replacement, until the color of a card drawn matches the color of the first card drawn. Find the average number of... more
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Statistics Question

06/09/15

central limit theorem
Per capita consumption of Spam in the US is Normally distributed with a mean of 2.3 pounds and a standard deviation of 0.9 pounds. Random sample of 20 people are chosen. Use the Central Limit... more
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Statistics Question Statistics

06/06/15

Construct a 95% Confidence Interval
There were 50 students in session 1 of a STA 13 class last year (the total # of students was 519). In the final exam, the average score in session 1 was 56.3 and the standard deviation was 13.8.... more
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06/06/15

Percentile Question!!
A random variable x has a normal distribution in the 50th percentile for x is 5. What is the mean of x?
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06/06/15

Finding Probabilities
Let z be a standard normal random variable. Find P(0.48 < z < 2.3 and z > 1.9).   I tried to do them both separately and then putting them together but I ended up with the wrong answer.... more
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Statistics Question

06/06/15

Five percent (0.05) of the parts produced by a machine are defective. Twenty parts are selected at random for study. A. what is the probability that 3 or fewer
Five percent (0.05) of the parts produced by a machine are defective. Twenty parts are selected at random for study.A. what is the probability that 3 or fewer parts are defective?B. what is the... more
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Statistics Question Statistics Proportion

06/05/15

P-Value of of Propotion
A poll taken just prior today finds that 389 of 700 registered voters intend to vote for Jake Anderson for mayor. We want to test Ho: q=0.5 where q represents the proportion of all voters who... more
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Statistics Question

06/03/15

combination or permutation
It happens that a graduate student in theoretical/mathematical physics is looking for five members of his dissertation committee. He has been working closely with three professors in the... more
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Statistics Question

05/16/15

In order to estimate the mean amount of time computer users spend on the internet each month...
In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within... more
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Statistics Question Math Statistics Math Help

05/13/15

Quick statistic question... I really don't understand. Thanks!!
The opera house has 2000 seats. there are 1200 seats on the main floor and 800 in the balcony. 40% of those in the balcony buy a program while 50% of people on the main floor buy a program. on... more
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Statistics Question Statistics

05/09/15

Providing an appropriate response
A psychologist wishes to estimate the mean IQ of students at one college. He picks a random sample of 49 students from the college, measures each student's IQ, and obtains the following 95%... more
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Statistics Question

05/09/15

Providing an appropriate response
A student wished to use a table of areas for the standard normal curve to find the z-score having an area to its right of 0.52. The student started by looking for the closest area to 0.52 in the... more
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Statistics Question

05/08/15

Statistics Help! Urgent!
Suppose that 16% of the population of the U.S. is left-handed. If a random sample of 130 people from the U.S. is chosen, approximate the probability that at least 20 are left-handed. Use the normal... more
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05/06/15

Can someone help me with this statistic question?
I have the following problem and can't figure it out. A mileage test is conducted for a new car model, the “Pizzazz.” Thirty random selected Pizzazzes are driven for a month and the mileage is... more
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Statistics Question

05/04/15

What percent of scores on this test will exceed 140?
Scores on a particular intelligence test are essentially normal with mean of 100 and standard deviation of 20. I have a statistics final today and im lost on how to solve this. I need a step by... more
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Statistics Question

05/03/15

more data points
does more data points improve your chances of finding a statistically significant difference
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Statistics Question

05/01/15

standard deviation
The mean daily snowfall amounts for whoville in Dec is 25 in and the standard deviation is 1.5 in assuming the data is normally distributed how many days would you expect the daily snowfall to be... more
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Statistics Question

04/29/15

distribution percentiles
suppose that the distribution of scores on an exam is closely described by a normal cure with mean 100. the 16th percentile of this distribution is 80. what is the 84th percentile?
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Statistics Question

04/28/15

Find the probability
A student takes a 15-question, true/false exam and guesses on each question. Find the probability ofpassing if the lowest passing grade is 12 correct out of 15. Would you consider this event likely... more
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Statistics Question

04/21/15

It is claimed that the average income in a particular community is $45,000.
It is claimed that the average income in a particular community is $45,000. The standard deviation of that income is known to be $4,000. A sample of 49 individuals is selected, and a sample mean of... more
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Statistics Question

04/20/15

the lengths, in feet, of various bridges are 88, 251,275,354,and 1,121. Name any outliers in the data set
this is a homework question about measures of variation, and im very confused.
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