844 Answered Questions for the topic Statistics Question

11/02/13

#### Statistics Question?

The technical support call center for a software company has a mean wait time of 210 seconds, with a standard deviation of 40 s. The management team wants to continue to improve customer... more

10/22/13

#### Joint Probability: Let P(A) = .3, P(B) = .4 and P( A U B ) = .7 a. What is the joint probability of A and B? b. Find the probability of the complement of A.

How would I go about answering these questions? Also, how do you differentiate between solving them as a dependent or an independent event?   Let P(A) = .3, P(B) = .4 and P( A ∪ B ) = .7   a.... more

10/18/13

#### You roll a die, flip a coin, and draw a card. What is the probability that:

You roll a die, flip a coin, and draw a card. What is the probability that:You roll a 3, flip a Head, and draw an Ace?

10/18/13

#### Empirical Rule: Mean is 84 with a standard deviation of 7. Approximately how much is between 63 and 98?

I would like to know how to go about getting the answer to these questions.     1. Empirical Rule: Mean is 84 with a standard deviation of 7. Approximately how much is between 63 and... more

09/30/13

09/29/13

#### ANOVA Excel Worksheet

The following table contains a random sample of 40 women partitioned into three groups:Group 1: ages below 20Group 2: ages 20 through 40Group 3: ages over 40the values in the table are systolic... more

09/25/13

#### Using statistics, find mean and probabilities

Soft Drink Cans The amount of soft drink that goes into a typical 355 ml can varies from can tocan.  It is normally distributed with an adjustable mean µ and a fixed standard deviation of 0.4 ml. ... more

09/13/13

#### in a population with a mean of 50, a score of 55 would have a deviation of ?

in a population with a mean of 50, a score of 55 would have a deviation of ?

09/03/13

#### How do I show Tchebysheffs's theorem,

Let a k ≥ 1. show that for any set of n measurements, the fraction included in the interval y¯ − ks to y¯ + ks is at least (1 - 1/k²).   hint:  s² = 1/(n-1)[ ∑(y - y¯)²] In this expression ,... more

06/22/13

#### What is the joint distribution of X1, X2?

X1, X2 is a random sample from Bernoulli distribution f(x)=px (1-p)(1-x) where x=0,1

06/12/13

#### Using this data, draw some kind of graph and tell the distribution of the graph

Using this data, draw some kind of graph and tell the distribution of the graph I need to have a graph and then know what the graph looks like such as skewed left and right 62 75 86 83 9877 92 96... more

06/09/13

#### Statistics question

published story saying farmers lead other groups in the consumption of alcohol. As evidence, a rehab center located in the rural part of the state treated more farmers than that of any occupational... more

06/03/13

#### What are the components in basic statistics?

Will you please let me know the basic components in statistics?

04/11/13

#### the systolic blood pressures have a normal distribution with a average 120 and a sd 8. the percentage of individuals with a systolic blood pressure above 120 is

the systolic blood pressures have a normal distribution with a average 120 and a sd 8. the percentage of individuals with a systolic blood pressure above 120 is

01/07/13

#### what type of data collecting method is a census?

anecdotal evidence or survey?

12/30/12

#### I have a math problem. I hardly know where to start. Can you help?

Here it is.  Wow..., this is really hard to read for  me. How many close friends do you have? Suppose that the number of close friends adults claim to have varies from person to person with mean 9... more

12/02/12

#### a random sample of 15 items from the first po

a random sample of 15 items from the first po

10/23/12

#### Is it possible to determine the mean of the distribution of 10 scores, but only 9 are given.

With a distribution of 10 scores, nine of them are 3, 5, 9, 1, 9, 2, 0, 3, and 9. The last one is greater than 5 but it is not 9.  Is it possible to determine the mean of the distribution?

10/13/12

#### explain chebyshev's theorm and empirical rule

i'm trying to figure out how to solve a problem. the mean is 50 and the st. deviation is 15. the question is,"what % of the data will fall between 50 and 110? I used the chebyshev's formula (1-1/k... more

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