Statistics Homework Answers & Questions

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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Waiting for answer Is a bell curve symmetric, rightskewed, or leftskewed?
Normal (commonly referred to as bell) curves are symmetric, because if you draw a line vertically through the mean of the distribution there is as much of the distribution on the left as there is on the right. If a distribution has more of the observations on the left side of the mean it is calle...
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Waiting for answer Permutation and combination? In your own words, explain the...
See explanation. Permutation of a set is a sequence in which the order is important (it means that for example ##135## and ##153## are two different permutations of a set ##{1,3,5}#...
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Waiting for answer A coin is flipped 12 times. What is the probability of getti...
##495/4096## The number of possible sequences of heads and tails in ##12## coin tosses is: ##2^12 = 4096## The number of ways that such a sequence could contain exactly ##8## hea...
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Waiting for answer What are independent trials, and how do they relate to the d...
In Probability we use the term Bernoullian trials for independent trials. A sequence of trials are said to be Bernoullian if (i) there are only two outcomes for each trial ( say a su...
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Waiting for answer How do you find the cumulative relative frequency?
It's a matter of adding up and taking percentages If you have a frequency table, you add a few columns to your table: Cumulative frequency Relative frequency Cumulative relative frequency Cumulative frequency You add the frequencies up to and including for the value Relative frequency You...
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Waiting for answer How do you find the central angle of a pie chart for a secti...
Each pie chart has 360°, since it is represented by a complete circle. If you are looking for 20% of that circle, you will use 20% of its 360 degrees as well. ##20/100 *360° = 72°## Or: You can say: ##100% hArr 360^0## so every ##1% hArr3.6^0## and work from there.
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Waiting for answer What is a voluntary response sample?
In survey sampling, voluntary response bias occurs when sample members are selfselected volunteers, as in voluntary samples . An example would be callin radio shows that solicit audience participation in surveys on controversial topics (abortion, affirmative action, gun control, etc.). An example...
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Waiting for answer What is a z score in regard to relative position?
Hi! A Zscore measures the "relative distance" of an observation in terms of standard deviations, from the mean. It gives an idea as to how far the observation is from its mean. A positive zscore indicates that the observation is above the mean and a negative value indicates that the observation is...
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Waiting for answer Suppose that X is a discrete random variable with probabilit...
##c = 10/3## ##E(x) = sum x* P(x)## Properties of p.d.f. include ##sump(x) = 1## ##sum P(x) = 1 ## = ## c[1 +4 + 9 + 16 ] = 1 ## = ##30c = 1 ## = ## c = 1/30.E(x) ## ## =...
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Waiting for answer What are "p hat" and "p"?
p is the population measure of the proportion, equal to X/N. it is called a parameter. phat is an estimate of p (above) derived from a finite sample, equal to x/n. it is called a statistic, normally written as ##hat p##
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Waiting for answer What is a uniform density curve?
The density curve for a probability distribution is its graphical representation. The area under a density curve is always equal to 1. The Uniform distribution has equal probabilities for all possible values in its range, so the Uniform density curve is just a horizontal line, running from the lowe...
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