945 Answered Questions for the topic Statistics Question

Statistics Question

04/19/15

Give a reason for conducting an experiment with two factors.
Give a reason for conducting an experiment with two factors.
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Statistics Question

04/18/15

what is the probability of getting eithier the sum of 8 or atleast one four in the roll of a pair of dice
This is a probability question and there are several more like this one
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Statistics Question

04/16/15

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

04/16/15

What is the number of degrees of freedom associated with the t-test, when data are gathered from a matched-pairs test with 20 pairs?
What is the number of degrees of freedom associated with the t-test, when data are gathered from a matched-pairs test with 20 pairs? a. 18 b. 19 c. 20 d. 38
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Statistics Question

04/14/15

true or false - An interval estimate may or may not contain the value of the parameterbeing estimated.
this is a statistics 125 test. im having trouble finding the answer
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Statistics Question

04/14/15

Below is a hypothesis test set up
Below is a hypothesis test set up by a student who recently took introductory statistics:   Ho: x = 5Ha: x ≠ 5   The sample mean of 100 cases used to implement the hypothesis test is x =... more
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Statistics Question

04/14/15

The population mean height of a basketball player is 200 cm
1.      The population mean height of a basketball player is 200 cm with a standard deviation of 15 cm. In a sample of 40 basketball players, what is the probability of getting a sample mean height... more
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Statistics Question

04/14/15

How many of the classes 27 students got more than 20 points?
The class had a math test where max you could get was 40. The most successful student got 38 points. The classes mean was 21, and the classes median was 20. How many of the classes 27 students got... more
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Statistics Question

04/13/15

A sample of 16 items had a mean of 30.
A sample of 16 items had a mean of 30. It is assumed that the population mean is 35 and the population standard deviation is 7. What is the z-value associated with this sample mean? a. -2.86 b.... more
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Statistics Question

04/13/15

What is the probability that a continuous random variable x will assume any specific value?
What is the probability that a continuous random variable x will assume any specific value? a. 0.0 b. 0.5 c. 1.0 d. There is not enough information provided to determine the probability.
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Statistics Question

04/13/15

If the z-value for a given value of x
If the z-value for a given value of x of the random variable x is z = 2.12 and x is normally distributed with a mean of 70 and a variance of 25, to what x-value does this z-value correspond?
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Statistics Question

04/09/15

Z-scores abd normal distribution
Z-scores are used to interpret scores from any normal distribution or ratio scores. I was asked if the Z=0. Do you knw the answer?
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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

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

04/01/15

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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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 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

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

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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