275 Answered Questions for the topic Stats

06/19/16

what distribution can be used to approximate probabilities for x ?
A computer terminal can pick up an erroneous signal from thekeyboard that does not show up on the screen. This creates a silenterror that is difficult to detect. Assume that for a particular... more
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06/19/16

A multiple choice quiz has 10 questions each with four alternatives.
A multiple choice quiz has 10 questions each with four alternatives. Apassing score is 6 or more correct. If a student attempts to guess the correct answer to eachquestion what is the probability... more
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06/18/16

C.D.F ,F(x)
The random variable X has pdf given by f(x)=(1+x),-1<x≤0 and f(x)=(1-x),0<x<1      &   and  f(x)=(1+x),-1<x<0 and f(x)=(1-x),0<x<1    && Could you help me how... more
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06/18/16

which function can I choose to find the mean and why?
The random variable X has pdf given by f(x)=(1+x),-1<x≤0       and       f(x)=(1-x),0<x<1   which function can I choose to find the mean and why?
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06/18/16

percentile of the distribution of a continuous random variable
Could you explain to me how can we find percentile of the distribution of a continuous random variable since I search on internet but I did not find ?Thanks in advance
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Stats

06/15/16

Statistics word problem
a study of 2958 collegiate soccer players showed that in 46 anterior cruciate ligament tears, 36 were in women. Calculate the percentages of tears for each gender
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Stats

06/01/16

when n=50 standard deviation of sampling distribution of x will be smaller than the standard deviation of the population?
i am someone that needs help in math!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
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05/18/16

Let P(A)=P(B)=0.42 and P(AnB)=0.13 Find P(A'?B')
Let P(A)=P(B)=0.42 and P(A∩B)=0.13   Find P(A'∪B')   solution   P(A'∪B')=P(A)+P(B)-P(A∩B)              =0.42+0.42-0.13=0.71   Is it correct?
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Stats

05/10/16

Stats Question Finding Range, Variance, and Standard Deviation
Find the range, variance, and standard deviation. Express answers using appropriate units, such as "minutes."   Presidential Longevity: Refer to Data Set 12 in Appendix B and use the numbers of... more
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05/07/16

Random sample
Suppose a geyser has a mean time between eruptions of 96minutes. If the interval of time between the eruptions is normally distributed with standard deviation 20 minutes, answer the following... more
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05/05/16

Please help with a statistics question.
THE MEAN TOTAL CHOLESTEROL FOR A POPULATION OF MEN BETWEEN THE AGES OF 20 AND 29 IS180 MICROGRAMS PER DECILITER WITH A STANDARD DEVIATION OF 34.8. A HEALTHY TOTALCHOLESTEROL LEVEL IS LESS THAN 200,... more
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04/19/16

use the given degree of confidence and sample data to construct a confidence interval for the population proportion p
If 92 adults selected randomly from one town, 70 have health insurance. Find a 90% confidence interval for the true proportion of all adults in the town who have health insurance 
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04/17/16

Find the best point estimate of the proportion of people who wear hearing aids if, in a random sample of 640 people, 73 people had hearing aids
Solve the proble. Round the point estimate to the nearest thousandth.
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Stats

04/15/16

If something only has a 20% chance of happening, how many times must it happen to reach 100%?
If something only has a 20% chance of happening, how many times must it happen to reach 100%?
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Stats

04/02/16

Staticis help
A psychologist is interested in knowing whether adults who were bullied as children differ from the general population in terms of their empathy for others. On a questionnaire designed to measure... more
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Stats

03/31/16

Estimation and Confidence intervals
A sample of 85 observations is taken from a normal population with a standard deviation of 52. The sample mean is 57. Determine the 98% confidence interval for the population mean. (Round the final... more
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Stats

03/30/16

Temps are normally distributed with a mean of 98.2, standard deviation of .62 find the temp that separates the top 7% from the lower 93%.
I am converting the x values to z scores and am getting -1.47 fro the lower and 1.47 for the top. even using technology I get the other temps 97.28 for the lower and 99.11 for the top. Just not... more
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03/29/16

Statistics question: A random sample of 40 statistics students had an average test grade of 81.5
A random sample of 40 statistics students had an average test grade of 81.5 and a standard deviation of 10.2. Construct the confidence interval for the population mean, μ if c = 0.90.   The... more
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Stats

03/28/16

find the value za/2 that corresponds to a confidence level 98.22%
I need it asap
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Stats

03/04/16

A particular disease affects 72 out of every 1000 residents of a city 1430000 residents. A diagnostic test for this disease claims to be 91% accurate.
If the diagnostic test is given to the entire population of this community   a. Determine the expected number of people who have this disease in this city.b.Out of those who presumably have the... more
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Stats

02/22/16

Problem 6*. Calculate the expected value for a continuous random variable with density function: ??|x|/10, -2 = x = 4; 0, otherwise.
calculate expected value 
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Stats

02/22/16

Calculate EX^3 and EX^4 for X ??~ N(0,1)
find the expected value ^3, and the expected value ^4
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Stats

02/22/16

For a random variable X with density ce^x, 0 = x = 2, find the constant c and find EeX
 find the constant c and the expected value of x 
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Stats

02/22/16

calculate the slope
(5.01) We expect a car’s highway gas mileage to be related to its city gas mileage (in miles per gallon, mpg). Data for all 1137 vehicles in the government’s 2013 Fuel Economy Guide give the... more
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Stats

02/18/16

Stats Homework question
Sophia who took the Graduate Record Examination (GRE) scored 168 on the Verbal Reasoning section and 153 on the Quantitative Reasoning section. Suppose mean score for Verbal Reasoning section for... more
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