Statistics Homework Answers & Questions

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.
$10.00 
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...
$10.00 
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....
$10.00 
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...
$10.00 
Waiting for answer In regression analysis, what does the Fvalue mean?
=f value mean,whether data linearly distributed or not ?
$10.00 
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....
$10.00 
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##...
$10.00 
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##....
$10.00 
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...
$10.00 
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,...
$10.00 
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...
$10.00 
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...
$10.00 
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...
$10.00 
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...
$10.00 
Waiting for answer Is the difference between an OLS regression and a GLS regres...
It is quantitative Ordinary least squares is a technique for estimating unknown parameters in a linear regression model. OLS yield the maximum likelihood in a vector ##β##, assuming...
$10.00 
Waiting for answer How does r squared related to standard deviation?
I always think of this as measures of spread so the spread from the regression line and the spread from the distribution should be highly correlated. so consider the regression line as a line that runs on the y axis at 0. Why 0 , well because that's what the mean is when we look at the distributio...
$10.00 
Waiting for answer What is the mode for the sample 3, 2, 5, 7, 3, 2, 6, 4, 3, 7...
3 The mode is the number that appears most often in the set. It is often easier to see these measures of central tendency by rewriting the set in order. Here: 1, 2, 2, 2, 2, 3, 3,...
$10.00 
Waiting for answer What is the average of 10, 18, and 23?
##(10+18+23)/3=51/3=17## The average (known as the "mean" in some circles) is found by adding up the values, then dividing by the number of values. In this case, it's ##(10+18+23)/3...
$10.00 
Waiting for answer At a restaurant, you can choose from 2 appetizers, 4 main co...
24 First you need to understand the process of selection and arrangement. Suppose you have 4 numbers  1, 2, 3, 4 and you have to form 3 digit numbers with all these numbers atmost...
$10.00 
Waiting for answer How is the confidence interval formula for the slope similar...
it has the same format. eg. 95% CI for ##B_1## = ##b_1## ##+_## SE(##b_1##)
$10.00