# Statistics Homework Answers & Questions

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• Waiting for answer A jewelry box contains two gold hoop earrings and two silver...

##1/4## ##Pr(1 silver)=1/2## ##Pr(2silver)=1/2*1/2=1/4##

• Waiting for answer How do you find the z-score for sample mean M = 90 for a sam...

##z=(bar x-mu)/sigma## Population standard deviation must be known for calculating z scores. You can also replace this by sample s.d. if sample size is large enough. So while you h...

• Waiting for answer What is a relative frequency table and what is it used for?

i will define this concept with the help of simple example (x )----frequency( f)------relative freq(1/f) 1---------------15--------------15/30 2--------------10--------------10/30 3---------------5--------------- 5/30 total ---------30-------------------1 it means each frequency is divided b...

• Waiting for answer What is the difference between a discrete random variable an...

A discrete random variable has a finite number of possible values. A continuous random variable could have any value (usually within a certain range). A discrete random variable is typically an integer although it may be a rational fraction. As an example of a discrete random variable: the value o...

• Waiting for answer How do you find the critical value of z alpha /2 that corres...

Critical value is 1.51 The confidence interval is 87%. It is the same as 0.87. ##(.87/2)## = 0.435 Consult the Area Under Normal curve table. It is available in all the statisti...

• Waiting for answer What is the difference between independent events and depend...

Independent Events The probability of one event happening isn't influenced by the outcome of another. In mathematical terms ## A,B " events", P(AnnB)=P(A)*P(B)## This reads: Probability of A and B happening is equal to the probability of A happening multiplied by the probability of B happenin...

• Waiting for answer Is the number of questions asked during a 1-hr lecture a dis...

It is a discrete variable. A discrete variable are WHOLE numbers. Would you ever ask half of a question? Nope! So with each question it would only increase to the next whole number.

• Waiting for answer The median is called a resistant measure, whereas the mean i...

Resistant in this case means it can withstand extreme values. Example: Imagine a group of 101 people who have an average (= mean ) of \$1000 in the bank. It also happens that the middle man (after sorting on bank balance) also has \$1000 in the bank. This median means, that 50(%) have less and 50...

• Waiting for answer The probability of drawing a green candy from a jar of 20 ca...

##10## yellow candies should be added to the jar in order to reduce the probability to ##1/6##. As the probability of drawing a green candy from a jar of ##20## candies is ##1/4##,...

• Waiting for answer How do I use a frequency distribution to find the class widt...

Simply take a class then take the difference of upper limit and lower limit and add 1. example Class 1 - 4 5 - 8 9 - 12 Take 1 - 4.. The right end numbers are upper class limits and the left end numbers are lower class limits.. to take the class width or class size UL - LL + 1 = 4 - 1 + 1 = 4,...

A question that is biased by the outcome desired by the researcher who generated the question. These questions are not neutral. In other words, these questions are designed to elicit a pre-determined outcome by the researcher who designed the questions, say for a survey, Political surveys are notori...

• Waiting for answer What is the mathematical formula for the F-statistic?

here's the mathematical formula. SSR-- Sum of Squares of Residuals SSRUR -- SSR of Unrestricted Model SSRR -- SSR of Restricted Model q -- number of restriction (the number of independent variables are dropped k -- number of independent variables n-k-1-- denominator degrees of freedom

• Waiting for answer What is the difference between a discrete uniform distributi...

An uniform distibution is a distribution that gives to all its values the same probability to occur. Continous case: the equal probability is given to all the values into an interval ##[a,b]##, which contains an infinite number of values. the value of the probability will depend on the range of...

• Waiting for answer What's the difference between a control, constant, dependent...

Controlled variable ##rArr## have nothing done to it. Constant variable ##rArr## kept the same Dependent variable ##rArr## you observed/measured Independent variable ##rArr## changed...

• Waiting for answer How do you create a boxplot in Excel?

To generate the box plots for three groups, enter Ctrl-m and select the Descriptive Statistics and Normality supplemental data analysis tool. A dialog box will appear. Select the Box Plot option and insert A3:C13 in the Input Range. Check Headings included with the data and un check Use exclusive ve...

• Waiting for answer What is the variance of the standard normal distribution?

The variance of Standard Normal Distribution represented by ##sigma^2## is equal to unity. ##sigma^2=1## A Standard Normal Distribution is a normal distribution with zero mean (mu=0...

• Waiting for answer What does it mean when a calculated chi-squared value equals...

It means that your observed value is equal to your predicted value. Your experimental results were the same as your predicted results. This is highly unlikely to happen in a real life experiment.

• Waiting for answer What is the difference between the R-Squared and adjusted R-...

Adjusted R-squared applies only to multiple regression As you add more independent variables to a multiple regression, the value of R-squared increases giving you the impression tha...

• Waiting for answer What is the purpose of an ogive?

An ogive, also known as a cumulative histogram, is a graph that is used to determine the number of data points that are equal to or below a certain value in a data set. An ogive is d...

• Waiting for answer What is the purpose of double blind experiments?

here the answer is quite simple Double blind experiments, in the context of medicine, are those in which neither the participants nor the experimenter is aware of who is receiving a treatment and who is receiving a placebo. This removes bias from both the participant and the experimenter. here i h...

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