Statistics Homework Answers & Questions

Waiting for answer What is the difference between statistical significance and...
is typically defined when the chance of falsely rejecting the null hypothesis is less than 0.05. To put it another way statistical significance occurs when there is less than a 5% chance that the measured result between groups is truly present and not just due to random effects. Practical signific...
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Waiting for answer How do you find the sample standard deviation on a TI84?
Standard deviation can be calculated using several methods on the TI84 C Silver Edition. Standard deviation can be calculated by using the stdDev() function. The stdDev() function can be located by performing the following: • Press [2nd][LIST]. • Scroll to MATH and select 7:stdDev(. Follow the exa...
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Waiting for answer How do you construct a cumulative relative frequency distrib...
Definitionwise cumulative frequency are simply accumulated frequency. Let's have the following definition: Less than cumulative frequency ( Cf) is the number of observations less than the upper class boundary of a class. Greater than cumulative frequency ( Cf) is the number of observations greate...
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Waiting for answer What is the significance of covariance? What does it mean wh...
Covariance is a linear measure of "connectivity." It is positive when the two variables you have at hand are positively connected. Covariance is a linear measure of "connectivity....
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Waiting for answer What is the formula of the expected value of a geometric ran...
If you have a geometric distribution with parameter ##=p##, then the expected value or mean of the distribution is ... expected value ##=1/p## For example, if ##p=1/3##, then the ex...
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Waiting for answer What is the sample standard deviation formula?
s= ## [(xmean)/(n1)]^(1/2)## there is one difference between sample and population std deviation is degree of freedom. In sample , n observations are free to change whereas 1 is not that is use for estimating a population parameter.
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Waiting for answer What is the definition of a "success" in a binomial setting?
In a Binomial setting, there are only two possible outcomes per try. Depending on what you want, you call one of the possibilities Fail and the other one Succes. Example : You may call rolling a 6 with a die Succes, and a non6 a Fail. Depending on the conditions of the game, rolling a 6 may cost...
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Waiting for answer What is the purpose of a measure of center in Statistics?
Measures of center are a way to try capture the nonrandomness of a population or a random variable.This may sound a bit confusing,so I will walk through the 3 most common measures of center and explain how they try to do that. Mean . The mean is the most common measure of center and it tries to...
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Waiting for answer A test consists of 910 true or false questions. If the stude...
##sqrt{910 * 0.5 * 0.5}=sqrt{227.5} approx 15.08##. The number ##X## of correct guesses in ##n=910## trials is a binomial random variable with probability ##p=0.5## of success. The...
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Waiting for answer The probability that a contractor will get a plumbing contra...
##19/45##, The procedure is explained below. A is the event of getting a plumbing contract and p(A) = ##2/3##. B is the event of getting electrical contract and p(B) = ##5/9##. A##...
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Waiting for answer For a normal distribution, mean u=8. Find standard deviatio...
The standard deviation is ##sigma=1.5## The zscore is ##=(rmu)/sigma## Here we know. ##mu=8## and ##P (6 r 10)=0.5 ## Therefore, ##P(8 r 10)=0.25## We look for the probabi...
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Waiting for answer What is the difference between the line of best fit and the...
Nothing ... they are the same thing. Least squares line minimizes the distance between the line and the raw data points which would be the same objective for a line of best fit. ho...
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Waiting for answer 14% compounded continuously
##15%## compounded semiannually is ##15.5625%## annually and ##14%## compounded continuously is ##15.027%## annually APY refers to how much money you earn on a deposit over a year, t...
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Waiting for answer In how many ways can 4 people be seated in a row of 12 chair...
I broke the question down into 2 parts, then solved them and multiplied the answer to get 11,880 ways. We can solve this by breaking down the question into 2 smaller questions. The f...
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Waiting for answer What does discrete mean?
That the variable you are interested in can only take on specific values. This is best demonstrated with real life examples. Discrete variables can only be certain numbers, integers...
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Waiting for answer What is the difference between a chi square test of independ...
chi square test of independence helps us to find whether 2 or more attributes are associated or not.e.g. whether playing chess helps boost the child's math or not. It is not a measure of the degree of relationship between the attributes. it only tells us whether two principles of classification ar...
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Waiting for answer Why is a 90% confidence interval narrower than a 95% confide...
See the explanation below. The answer is with particular reference to the Normal distribution. A test procedure starts with fixing the level of significance at 5% or 10% or 1% and...
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Waiting for answer How do you find the zscore for which 95% of the distributio...
Using a zscore table: The area of the tails must be .05 (which is 1  .95), and each tail must be .05/2, or .025. Find .025 in the interior part of a zscore table. See that it corresponds to a zscore (the numbers in the margins) of 1.96. That is the answer. Using a TI83 or TI84 graphing calcula...
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Waiting for answer How do you find the experimental probability of a compound e...
Product of the simple events is the probability of a compound event. Occurrence of more than one event simultaneously or one after another is called a compound event. In such cases...
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Waiting for answer What is the meaning of a double blind experiment?
In a doubleblind experiment, the person receiving the treatment and the person administering the treatment are both "blind". This means that neither one of them knows whether the treatment being given is the treatment being tested or the control treatment (such as a placebo).
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