1,012 Answered Questions for the topic Statistics Question

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

04/16/15

An airline claims that 65% of its flights depart on time.
An airline claims that 65% of its flights depart on time. A sample of 100 flights was examined and it was determined that 63% left on time. If the goal is to test whether less than 65% of the... more
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Statistics Question

04/15/15

Statistics need answer before 1:35 CST
The chance you have cancer is 1/100.There is a cancer test.The probability that the test will read yes if you DO have cancer is 90%.The probability that the test will read positive if you do not... more
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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

1. A bank has determined that the monthly balances
1.      A bank has determined that the monthly balances of customers' savings accounts are normally distributed with an average of $1,350 and a standard deviation of $250. What percentage of... more
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Statistics Question

04/14/15

A week in october the average temperature was 6 degrees celcius. The median was 5 degrees celcius. What was the typical value?
A week in october the average temperature was 6 degrees celcius. The median was 5 degrees celcius. What was the typical value?
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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

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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