1,029 Answered Questions for the topic Statistics Question

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

The scores for a group of high school students in a national physics examination were
The scores for a group of high school students in a national physics examination were normally distributed with a mean of 86 and a standard deviation of 4. If there were 97,680 students with scores... 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 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

03/31/15

Chebychevs theorm
For sample of people playing a certain carnival game it took an average of 15 throws to score a basket the standard deviation is . At least what percentage of people score a basket in 11 to 19... more
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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 Homework Tips

03/26/15

Statistics Homework Help!
The diameter of of hail hitting the ground during a storm is normally distributed with a mean of .5 inch and a standard deviation of .1 inch.  What is the probability that:   A)  A hailstone... 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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