Statistics Homework Answers & Questions

Waiting for answer How do you calculate critical value chi squared?
The chisquare statistic is used to compare two categorical variables to see if they are related. Calculating the statistic involves looking the figure up in the chisquare table. w...
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Waiting for answer How do you find the mean, median, mode and range of 30, 34,...
See explanation. First thing we need tio do is to put the data in increasing order. This is needed to calculate the median: ##30,31,32,33,34,35,35,36,37,39## Now we can calculate t...
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Waiting for answer If a person scores in the 45th percentile on the ACT, how do...
It means that about 45% of the people did worse, and about 55% did better. You can 'carve up' your population according to score. You probably now the term median , which is the value of the middle of your population (when arranged by value). Quartiles are also widely used, they divide the (ordere...
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Waiting for answer What does a negative correlation coefficient mean about a sc...
A negative correlation means that there is an inverse relationship between two variables. A negative correlation means that there is an inverse relationship between two variables. T...
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Waiting for answer A card is drawn from a standard deck of 52 playing cards. Wh...
##2/13## There are 52 cards in a standard deck: 13 ordinal cards (Ace  10, Jack, Queen, King) and 4 of them  one to each suit (hearts, diamonds, clubs, spades) and so we have ##4xx...
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Waiting for answer What is the average deviation of ##1.76, 2.28, 1.90##?
mean deviation ##=0.2## Compute mean ##barx## ##barx=(1.76+2.28+1.90)/3=1.98## Mean deviation ##=(sum abs(xbarx))/n## Mean deviation ##=(abs(1.761.98)+abs(2.281.98)+abs(1.901....
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Waiting for answer What is the formula for calculating the test statistic for a...
Is it onepopulation z test? Because we cannot have one sample only in stat experiments. In z test, it is preferable to have n = 30. We have the formula, z= (computed mean  hypothesized mean) divided by the standard error. SE(standard error) = standard deviation/n.
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Waiting for answer A sock drawer has 8 blue socks and 6 black socks. If I rando...
##24/91## Calculate first the total number of permutation possible. You select two socks so that will be: ##14*13=182## Now you must first select a blue sock then a black sock: Y...
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Waiting for answer Is the fuel efficiency (in miles per gallon) of an automobil...
Continuous an easy way to check if your data is discrete of continuous is to ask yourself, will my result be a ##RR## number? if so, then your data will most likely be continuous, as you could end up with ##oo## many different results. which in this case, you could go ##3.4657## miles per gallon....
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Waiting for answer How does an outlier affect the value of the standard deviati...
Outliers increase the standard deviation. Mean is most affected by outliers, since all values in a sample are given the same weight when calculating mean. A value that is far removed...
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Waiting for answer In regression analysis, what does the Fvalue mean?
=f value mean,whether data linearly distributed or not ?
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Waiting for answer What is the difference between the Pearson correlation coeff...
Pearson's productmoment correlation is used on two continuous variables that are not nonlinearly related; Spearman's rho is used on ordinal data, but also works for monotonic relationships....
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Waiting for answer What is the median number for the numbers 4, 8, 10, 5, 9?
Median ##=8## No. of the observation ## = n = 5 ## which is odd. So, median of the given data will be calculated as follows: ##Median = "(n + 1)"/"2" = "(5 + 1)"/2 = 6/2 = 3^rd##...
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Waiting for answer Blood types A, B, O, and AB have percentages 40%, 20%, 30% a...
The probability is ##0.36## or ##36%## The probability that one chosen person is off blood type ##A## is ##40%=0.4## so the probability that he is not of blood type ##A## is ##0.6##....
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Waiting for answer What are class boundaries in statistics?
See explanation. Class boundaries are true class limits. Recall: Class limits are end numbers of a class interval. For instance, we have a class interval ##1  5##. ##1## is call...
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Waiting for answer How many different ways can you choose 3 vowels out of the b...
##10## different ways There are 5 vowels and we need to take 3 and order does not matter. Therefore, this is a combination problem. For example, ##A, E, O##, and ##E,O,A## and ##O,...
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Waiting for answer What is the importance of a histogram?
A histogram is a quick way to get information about a sample distribution without detailed statistical graphing or analysis. Without needing to have a good graphing program, plotting...
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Waiting for answer Is temperature a discrete or continuous variable?
Temperature is a continuous variable. Temperature is a continuous variable because its value can assume any value from the set of real numbers between 273 degrees Celsius (absolute...
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Waiting for answer If we remove all of the queens from a 52card deck, how many...
##194,580## unique hands If thee 4 queens are removed, we will have 48 cards to choose from. There are ##48xx47xx46xx45## different combinations of cards which are possible, but in...
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Waiting for answer A bowl of fruit is on the table. It contains six apples, two...
##P(O,O) = 2/12 xx 1/11 = 1/66## For probability questions, think of each event happening separately, it makes the maths easier to understand. For example, in this question, do not t...
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