970 Answered Questions for the topic Statistics Question

Statistics Question

04/09/15

Pearson Correlation Coefficient
After calculating the Pearson Correlation Coefficient r, under what circumstances should you continue and calculate a regression equation? Why?
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Statistics Question Probability

04/09/15

Probability Stats question
Suppose that company A and company B manufacture and supply equivalentparts to a customer. Among parts from company A, 5% are defective; among company B,7% are defective. Suppose that a randomly... more
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Statistics Question

04/07/15

If students have fish (brain food?) the evening before each assignment, they will perform better.
Now suppose I have a hypothesis that if students have fish (brain food?) the evening before each assignment, they will perform better. How much better would they have to do in order for me to... more
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Statistics Question

04/07/15

Statistics
A public bus company official claims that the mean waiting time for bus number 14 during peak hours is less than 10 minutes. Karen took bus 14 during peak hours on 18 different occasions. Her mean... more
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Statistics Question

04/02/15

Statistics problem about tossing a coin
An experiment consists of first rolling a die and then tossing a coin.a. List the sample space.b. Let A be the event that either a three or a four is rolled first, followed by landing a head on the... more
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Statistics Question

04/01/15

the failure rate in a statistics course is 20%. in a class of 30 students, find the probability that exactly five students will fail the course
the failure rate in a statistics course is 20%. in a class of 30 students, find the probability that exactly five students will fail the course
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Statistics Question Math Statistics Math Help

03/31/15

Compute the Mean & Standard Deviation from percentile values of a distribution
I have been given values for 10%, 50% and 90% of a distribution. From these numbers, how can I compute the mean and standard deviation?   I'll give an example....Temperature distribution 10th... more
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Statistics Question

03/29/15

Before concluding that a “cause and effect” relationship may exist for a set of paired observations (X,Y) ....
explain:    Before concluding that a “cause and effect” relationship may exist for a set of paired observations (X,Y), one must first rule out alternative explanations that seem plausible. List... more
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Statistics Question

03/27/15

Explain random sampling and why it is important.
Explain random sampling and why it is important.
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Statistics Question

03/26/15

It's most correct to view the normal curve as
It's most correct to view the normal curve as a) a batch of observations. b) a frequency distribution. c) an observed frequency distribution. d) a theoretical frequency distribution.
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03/26/15

Statistics Problem Need Help!
What sample size is required in order that the standard deviation of X(with bar) be:   A. 1/4 of the population standard deviation?   B. 1/7 of the population standard deviation?   C. 12% of... more
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Statistics Question Homework Tips

03/26/15

Statistics Problem Need Help!
Suppose the amount of a popular sport drink in bottles leaving the filling machine has a normal distribution with mean 101.5 ml and standard deviation of 1.6 ml.   A.  If the bottles are labeled... more
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Statistics Question Statistics Homework Tips

03/26/15

Statistics Homework Help!
A random sample of size 2 is selected, with replacement, from the set of numbers (0,2,4)   A. List all possible samples and evaluate X(with Bar) and S2   B. Determine the sampling distribution... more
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Statistics Question Statistics Helping Others

03/26/15

Statistics Problem Need Help!
The time it takes a symphony orchestra to play Beethovens Ninth Symphony has a normal distribution with a mean of 64.3 minutes and a standard deviation of 1.15 minutes. The next time it is played... more
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Statistics Question Math Statistics Math Help

03/26/15

Need some help on a statistics problem
1) CBS and the NYT conducted a national poll of 1048 randomly selected 13 to 17-year olds and counted how many owned smart phones. The reporters were trying to decide whether more than half of... more
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Statistics Question

03/26/15

On a reading comprehension test, it would be preferable to achieve a z score of
On a reading comprehension test, it would be preferable to achieve a z score of a) 2.34 b) 3.50 c) 0.00 d) 1.00
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Statistics Question

03/25/15

If the normal curve is used to describe the distribution of IQ scores ..??
If the normal curve is used to describe the distribution of IQ scores for all currently enrolled students in U.S. colleges and universities, all students are identified with the a) smooth normal... more
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Statistics Question

03/25/15

statistics question
For year 2003, the SAT test scores were normally distributed with a mean of 1050 and a standard deviation of 150.What percentage of the SAT scores is above 1050?
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Statistics Question

03/25/15

Addition Rule and when do you use the Multiplication Rule in probablity , What is the difference?
Im currently trying to understand addition and multiplication probability I just need some assistance for a clearer understanding
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Statistics Question Statistics

03/25/15

STAT HELP Question
In the 2010 World Cup, Paul the Octopus (in a German aquarium) became famous for being correct in all eight of the predictions it made, including predicting Spain over Germany in a semi-final... more
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03/24/15

Help finding the sample size! Statistics
A paint manufacturer uses a machine to fill gallon cans with paint.   a)The manufacturers wants to estimate the mean volume of paint the machine is putting in the cans within 0.25 ounces.... more
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Statistics Question

03/23/15

statistics
he amount of coffee that a filing machine puts into an 8 ounce jar is normally distributed with a mean of 8.2 ounces and a standard deviation of 0.18 ounce what is the probability that the sampling... more
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Statistics Question

03/19/15

Probability of draws without replacement. please help! I'm stuck!
An urn contains red balls and white balls. If Frank chooses balls at random from the urn, what is the probability that he will select red balls and white balls? Round your answer to decimal... more
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Statistics Question

03/19/15

Probability of Draws
A history class is comprised of female and male students. If the instructor of the class randomly chooses students from the class for an oral exam, what is the probability that female students... more
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Statistics Question

03/19/15

Probability
An urn contains white balls and red balls. If Juan chooses balls at random from the urn, what is the probability that he will select white balls and red balls? Round your answer to decimal... more
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