1,006 Answered Questions for the topic Statistics Question

Statistics Question

07/27/16

what is the probability that a randomly selected month has photocopy cost higher than 590.00$?
a corporation calculates that the cost of photcopies follows a normal distrubution with a mean of 500$ per month and a standard deviation of $50 per month.
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Statistics Question

07/26/16

Statistics Confusion Please Explain
A state has a lottery game where a person picks one of the 1000? three-digit numbers between 000 and 999. The lottery selects a? three-digit number at random. With a bet of? $1, a person wins $500... more
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Statistics Question

07/22/16

Using the empirical rule, approximately what percent of the score are: less than 360?
The test scores on the quantitative portion of the Scholastic Aptitude Test (SAT) are normally distributed with a mean score of 570 and SD of 70. Using the empirical rule, approximately what... more
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Statistics Question

07/16/16

Construct the confidence interval for the mean number of words a third grader can read per minute.
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an estimate at the 80% level of confidence. For a sample of 448 third... more
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Statistics Question

07/09/16

What would you expect to see if you were calculating the sample STANDARD DEVIATION of sales from a convenient store
What units would you expect to see if you were calculating the sample STANDARD DEVIATION of sales from a convenient store? 
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Statistics Question

07/08/16

normal distribtuion
he amount of money that a student at harvard university carries on his/her person is normally distributed with a mean of $25 and a standard deviation of $5. What is the probability that a randomly... more
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Statistics Question

07/06/16

statistics
in a standard normal distribution find the area under the cure for z -scores less than -1.23 round to the 4 decimal places?
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Statistics Question Statistics

07/06/16

A bank manager decides to study waiting times of customers for teller service at the noon lunch hour (noon to 1pm). He selects one customer every 20 minutes to
A bank manager decides to study waiting times of customers for teller service at the noon lunch hour (noon to 1pm). He selects one customer every 20 minutes to measure the time the customer enters... more
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Statistics Question

07/02/16

What is the probability that none of the restaurants are in violation of the health code?
Suppose 40% of the restaurants in a certain part of a town are in violation of the health code. A health inspector randomly selects seven of the restaurants for inspection.
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Statistics Question Statistics Probability Stats

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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Statistics Question Statistics Probability Stats

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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Statistics Question Statistics Probability Stats

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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Statistics Question Standard Deviation

06/26/16

If birth weights in a population are normally distributed with a mean of 109oz and a standard deviation of 130z.
A) What is the chance of obtaining a birth weight of 141 oz or heavier when sampling birth records at random? B) What is the chance of obtaining a birth weight of 120 or lighter?
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Statistics Question

06/26/16

Area under the curve > Z=1.34
I'm learning statistics all over again. I need to see how to find the area under the curve using z tables.
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Statistics Question

06/22/16

im not sure how to do this question
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.933 g and a standard deviation of 0.308 g. Find the probability of randomly selecting a cigarette... more
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Statistics Question Statistics Probability Stats

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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Statistics Question Statistics Probability Stats

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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Statistics Question Statistics Probability Stats

06/19/16

what distribution can be used to approximate probabilities for x ?
A computer terminal can pick up an erroneous signal from thekeyboard that does not show up on the screen. This creates a silenterror that is difficult to detect. Assume that for a particular... more
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Statistics Question Statistics Probability Stats

06/19/16

A multiple choice quiz has 10 questions each with four alternatives.
A multiple choice quiz has 10 questions each with four alternatives. Apassing score is 6 or more correct. If a student attempts to guess the correct answer to eachquestion what is the probability... more
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Statistics Question Statistics

06/19/16

I have a question from my online statistics class.
The study on calories burned per minute by walking had data from adult women only. If Shawna used the regression equation to extrapolate the calories burned per minute for a young boy, she would... more
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Statistics Question Statistics Probability Stats

06/18/16

C.D.F ,F(x)
The random variable X has pdf given by f(x)=(1+x),-1<x≤0 and f(x)=(1-x),0<x<1      &   and  f(x)=(1+x),-1<x<0 and f(x)=(1-x),0<x<1    && Could you help me how... more
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Statistics Question Statistics Probability Stats

06/18/16

which function can I choose to find the mean and why?
The random variable X has pdf given by f(x)=(1+x),-1<x≤0       and       f(x)=(1-x),0<x<1   which function can I choose to find the mean and why?
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Statistics Question Statistics Probability Stats

06/18/16

percentile of the distribution of a continuous random variable
Could you explain to me how can we find percentile of the distribution of a continuous random variable since I search on internet but I did not find ?Thanks in advance
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Statistics Question

06/15/16

Statistics home work
Gocerment agencies carefully monitor water quality and it's effect on wetlands. Of particular concern is the concentration of nitrogen in water draining from fertilizer lands. Twenty-eight samples... more
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Statistics Question

06/15/16

Identify the sample space of the probability experiment and determine the number of outcomes in the sample space.
Identify the sample space of the probability experiment and determine the number of outcomes in the sample space.               rolling dice
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