275 Answered Questions for the topic Stats

11/16/16

Probability Function
The probability density function f(x) of a continuous random variable X is:   f(x)={ -kx, If -1<x<o       ={k, If o≤x<1, where k is a positive constant.       ={o, otherwise. I, Graph... more
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Stats

11/13/16

What would be considered ordinal
I need to know what these variables would be classified as. Nominal, Ordinal, Interval and Ratio   The individuals are undergraduate students at the University of Wisconsin. The variables are... more
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11/05/16

Each month, the census bureau mails survey forms to 250,000 households asking questions about the people living...
Each month, the census bureau mails survey forms to 250,000 households asking questions about the people living in the household and about such things as motor vehicles and housing costs. Telephone... more
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11/03/16

The variation found among raw scores in a particular group in referred to as
The variation found among raw scores in a particular group in referred to as: a. between group variation b. Within group variation C. Total variation  d. None 
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Stats

10/20/16

prob stats
An essay test has 12 questions. Students are required to answer 9 of the 12 questions. How many different sets of questions could be? answered?
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Stats

10/17/16

How many three-flavor ice cream cones are possible to order at Baskin-Robbins that boasts a total of 31 flavors.
How do i solve this problem, been struggling for a while on it 
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Stats

10/15/16

If one fly ball is randomly chosen from this distribution, what is the probability that this ball traveled fewer than 184 feet?
Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed with a mean of 210 feet and a standard deviation of 44 feet. Let X = distance in feet for a fly... more
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10/05/16

statistics - normal distribution multiple choice
  The variable X is normally distributed with a mean u and a standard deviation o. Let A be a value of X. For the current values of u, o, and A it is known that P(X<A)=.4512. If the value of of... more
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Stats

10/04/16

stats question
the average grade on an algebra exam was 76% with a standard deviation of 6 percentagepoints. the average grade on a chem exam was 81% with a standard deviation of 2 percentage points. julie got a... more
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Stats

09/29/16

about 2.5% of chicago cab drivers are women. suppose 125 of thecity's cab drivers are randomly selected. Let x be the number of women in the sample.
find the binomial distribution find the mean standard deviation p (x=8)
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Stats

09/27/16

The survey included 71 students who smoke and 315 who don’t. Find p Overscript ^ EndScripts, the proportion who smoke.
Round your answer to three decimal places.
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Stats

09/04/16

Calculate the population variance of these numbers to the nearest hundredth. 5 0 -7 14 5 2 7 2 2 15 11 -9
Calculate the population variance of these numbers to the nearest hundredth.5 0 -7 14 5 2 7 2 2 15 11 -9
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08/09/16

In general, increasing sample size (n) effects type I error (alpha) and type II error (beda) in which of the following ways
A. Alpha increases , beta decreases  B. Alpha increases , beta increases  C. Alpha decreases , beta decreases  D. Alpha decreases , beta increases 
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08/08/16

What hypothesis would you use to test a claim that the majority of americans approve of public health care option?
A politician claims that the majority of americans approve of a public health care . A survey of 500 randomly selected adults found that 346 approve of a public health care option. 
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08/08/16

What is the sample portion?
A politician claims that the majority of americans approve of a public health care option.  A survey of 500 randomly selected adults found that 346 approve of a public health care option. 
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08/08/16

What type of test is it ? Left tail , right tail , or two tail
A politician claims that the majority of americans approve of a public health care option. A survey of 500 randomly selected adults found that 346 approve of a public health care option. 
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Stats Statistics

08/08/16

mayor claimed that better than 60% of eligible voters turned out in last yearA random sample indicated out of 739 voters465 voted 5% sig. Lvl The test statistic
A. Z= -1.62 B. Z= - 12.72 C. Z= 1.62 D. Z= 12.72
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Stats

07/12/16

Find p and q, if X1 = 11, n1 = 30, X2 = 28, and n2 = 80
 Find p and q , if X1 = 11, n1 = 30, X2 = 28, and n2 = 80
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06/27/16

A nonnegative integer-valued random variable X has a CDF of the form F(x)=1-(1/5)^x for x=1,2,.....and zero otherwise. Find P(X is odd)?
A nonnegative integer-valued random variable X has a CDF of the form F(x)=1-(1/5)^xfor x=1,2,.....and zero otherwise.Find P(X is odd)? could you please help me with that?
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06/27/16

Suppose a lie detector test has the following properties.
Suppose a lie detector test has the following properties.If the suspect is telling the truth,the lie detector will correct say so with probability 0.85.if the suspect is lying ,it will correctly... more
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06/27/16

A lot consists of 15 articles of which 8 are free of defects ,4 have minor defects and 3 have major defects.Five articles are selected at random without replace
A lot consists of 15 articles of which 8 are free of defects ,4 have minor defects and 3 have major defects.Five articles are selected at random without replacement find probability that at most... more
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Stats

06/27/16

probability
There are 40 people on the Western Dubuque faculty. Of these 40, 15 are men and 25 are women. Use this information to answer the following questions. a. A committee of 8 is to be selected by the... more
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Stats

06/27/16

marble probability
A bag contains 20 marbles: 5 yellow, 2 white, 3 blue, and 10 green. If 4 are selected at random, find the probability thata.2 are yellow, with replacement   b. 2 are yellow, without replacementc.... more
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06/21/16

Find the probability that the roots of the equation h(t)=0 are real where h(t)=t^2+2tx+y
assume that x and y are independent with x ~EXP(2) and Y~Exp(1) Find the probability that the roots of the equation h(t)=0 are real where h(t)=t^2+2tx+y   Could you please help me how can I find... more
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06/20/16

what is the probability that at least one scored 650 or better?
math sat scores are normally distributed with mean 500 and standard deviation of 100 ten students are selected at random what is the probability that at least one scored 650 or better?   please... more
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