275 Answered Questions for the topic Stats

Stats

08/15/17

A uniformly distributed random variable has minimum and maximum values of 20 and 60, respectively. A) Draw the density function? B)determine P(35<x<45).
 C) Draw the density function including the calculation of the probability in part B.
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07/29/17

Compare and contrast the following measures of dispersion (range, standard deviation) in terms of what each of these represent and in terms of the relative adva
Compare and contrast the following measures of dispersion (range, standard deviation) in terms of what each of these represent and in terms of the relative advantages/disadvantage of using one over... more
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Stats

07/11/17

suppose 40 cars start at the Indianapolis 500. In how many ways can the top 3 cars finish the race?
Stats question
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Stats

06/29/17

What is the probability that the human chess champion wins a majority of the game? Equation to deal with the problem?
the maker of a computer chess game claims the game can beat a human chess champion 35& of the time. A human chess champion plays ten games against the computer. Assuming the manufactures claim... more
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05/26/17

the box and whisker plot can be used to identify
A) Skewedness B) Outliers C) Symmetry D) Centerness
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Stats

05/12/17

ALEKS statistics
A newspaper article reported that people spend a mean of 7.5 hours per day watching TV, with a standard deviation of 1.8 hours. A psychologist would like to conduct interviews with the 5% of the... more
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Stats

04/20/17

Finding Normal probability distribution
The weight of a newborn baby is believe to have a normal distribution with mean of weight of 3915 and variance of 429,025. If one baby is randomly selected what is the probability that the weight... more
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04/17/17

confident intervals and central limit theorem.
A random sample of 39 cows was fed a special high-protein grain for a month. Each was weighed before and after and the average weight gained was 6.7 pounds, with standard deviation 7.1.i. Construct... more
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Stats

04/16/17

determining decision rule for rejecting null hypothesis
A sample of 900 computer chips revealed that 53% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature states that 51% of the chips do not fail in the... more
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Stats

04/15/17

Margin of error
A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n=1009 and x=531 Who said "yes". Use a 95% confidence level.  Identify the value of the margin or... more
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03/29/17

Statistics: Confidence Intervals
6. Independent random samples were drawn from two normal populations assumed to have the approximatelythe same standard deviation, resulting in the following summary statistics:n1 = 25, s1 = 4.8,... more
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Stats

03/25/17

Find the z-score for which the area under the standard normal curve to its right is 0.70?
Stats, mult choice the answer is neg but I keep getting a pos answer
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Stats

03/03/17

Suppose the mean income of firms in the industry for a year is $55 million dollars with a standard deviation of 17 million dollars.
If incomes for the industry distrubuted normally, what is the probablilty that a randomly selected firm will earn between 44 and 90 million dollars?
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Stats

02/25/17

stats question
A ski gondola carries skiers to the top of a mountain. It bears a plaque stating that the maximum capacity is 15 people or 2475lb. That capacity will be exceeded if 15 people have weights with a... more
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02/24/17

A highly selective university will only admit students who place in the top 10% on aplacement exam with an average score of 18 and an SD of 6.
The lowest score that a student can earn and be admitted to the university is:         Please help me my Stats teacher is very unclear and is rushing through the material. I cannot fail this... more
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Stats

02/21/17

Statistics
 Cans of regular Coke are labeled as containing 12 oz. Statistics students weighed the contents of 6 randomly chosen cans, and found the mean weight to be 12.15 ounces. Assume that cans of Coke are... more
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Stats

01/30/17

7. What are the values for SS and a variance for the following sample of n = 4 scores? Sample: 1, 1, 0, 4
Please provide what the best answer is : a. SS = 9 and variance = 2.25b. SS = 18 and variance = 9c. SS = 18 and variance = 6d. SS = 9 and variance = 3
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Stats

01/30/17

Suppose the mean for this exam was M = 78, and you obtain a score of X = 84. Would I prefer the Would you prefer a standard deviation of s = 2 or s = 10?
PLease explain the reasoning for this 
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Stats

01/08/17

A typical unladen swallow has an air-speed velocity of with a mean of 22 m/s and a standard deviation of 1.5 m/s.
A typical unladen swallow has an air-speed velocity of with a mean of 22 m/s and a standard deviation of 1.5 m/s. What is the probability that a randomly chosen unladen swallow will have an... more
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Stats

12/17/16

Number of ways we can award a 1st, 2nd and 3rd place price among 8 contestants?
Number of ways we can award a 1st, 2nd and 3rd place price among 8 contestants?
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Stats

12/08/16

Need help figuring this with an,explanation
A bag has 4 red marbles and 6 green marbles . You will draw a marble from the bag . if it is red, replace it and draw another marble. If it is green , leave it out and draw another marble . what is... more
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Stats

12/04/16

In a hypoth. test using a t statistic, what is the influence of a large sample standard deviation?
-Can`t determine w/o more info.-The size of the standard dev. has no impact on outcome of the hyp. test.-Larger standard deviation tends to increase the likelihood of rejecting the null... more
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11/28/16

May you please help me?
do cafe customers stay longer with darker lighting- is this observational or observational with case control     It's either a.observational b.observational with case control c.experiment or... more
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11/28/16

Statistics/psych Question
The second one is: do cafe customers stay longer with dark let lighting- is this observational,observational with case control,experiment,experiment with single or double blinding
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11/28/16

Statistics Question!
Do adding multivitamin supplements to your daily diet help decrease the number of colds caught...is this a double blind or single blind study?
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