university of phoenix
Practice Set 3
1. Let x be a continuous random variable. What is the probability that x assumes a single value, such as a (use numerical value)?
2. Thefollowingarethethreemaincharacteristicsofanormaldistribution.
A. Thetotalareaunderanormalcurveequals _____.
B. Anormalcurveis___________aboutthemean.Consequently,50%ofthetotalareaunderanormaldistributioncurveliesontheleftsideofthe mean,and50%liesontherightsideofthemean.
C. Fill in the blank. Thetailsofanormaldistributioncurveextendindefinitelyinbothdirectionswithouttouchingorcrossingthehorizontalaxis.Althoughanormalcurvenevermeetsthe________axis,beyondthe pointsrepresentedby µ – 3σ to µ+ 3σ itbecomessoclosetothisaxisthattheareaunderthecurve beyondthesepointsinbothdirectionsisveryclosetozero.
3. For the standard normal distribution, find the area within one standard deviation of the
mean that is, the area between μ − σ and μ + σ. Round to four decimal places.
4. Find the area under the standard normal curve. Round to four decimal places.
a) between z = 0 and z = 1.95
b) between z = 0 and z = −2.05
c) between z = 1.15 and z = 2.37
d) from z = −1.53 to z = −2.88
e) from z = −1.67 to z = 2.24
5. Theprobabilitydistributionofthepopulationdataiscalledthe (1) ________.Table7.2inthe textprovidesanexampleofit.Theprobabilitydistributionofasamplestatisticiscalledits (2) _________.Table7.5inthetextprovidesanexampleit.
A. Probability distribution
B. Population distribution
C. Normal distribution
D. Sampling distribution
6. ___________isthedifferencebetweenthevalueofthesamplestatisticandthevalueofthecorrespondingpopulationparameter,assumingthatthesampleisrandomandnononsamplingerrorhasbeenmade.Example7–1inthetextdisplayssamplingerror.Samplingerroroccursonlyinsamplesurveys.
7. Consider the following population of 10 numbers. 20 25 13 19 9 15 11 7 17 30
a) Find the population mean. Round to two decimal places.
b) Rich selected one sample of nine numbers from this population. The sample included the numbers 20, 25, 13, 9, 15, 11, 7, 17, and 30. Calculate sampling error for this sample. Round to decimal places.
8. Fill in the blank. TheFdistributionis________andskewedtotheright.TheFdistributionhastwo numbersofdegreesoffreedom:dfforthenumeratoranddfforthedenominator.TheunitsofanFdistribution,denotedbyF,arenonnegative.
9. Find the critical value of F for the following. Round to two decimal places.
a) df = (3, 3) and area in the right tail = .05
b) df = (3, 10) and area in the right tail = .05
c) df = (3, 30) and area in the right tail = .05
10. The following ANOVA table, based on information obtained for three samples selected from three independent populations that are normally distributed with equal variances, has a few missing values.
Source of Variation 
Degrees of Freedom 
Sum of Squares 
Mean Square 
Value of the Test Statistic 
Between 
2 
II 
19.2813 

Within 

89.3677 
III 
F = ___V__ = VII VI 
Total 
12 
IV 


a) Find the missing values and complete the ANOVA table. Round to four decimal places.
b) Using α = .01, what is your conclusion for the test with the null hypothesis that the means of the three populations are all equal against the alternative hypothesis that the means of the three populations are not all equal?
At 111papers.com, we value all our customers, and for that, always strive to ensure that we deliver the best topquality content that we can. All the processes, from writing, formatting, editing, and submission is 100% original and detailoriented. With us, you are, therefore, always guaranteed quality work by certified and experienced writing professionals. We take pride in the university homework help services that we provide our customers.
As the best homework help service in the world, 111 Papers ensures that all customers are completely satisfied with the finished product before disbursing payment. You are not obligated to pay for the final product if you aren’t 100% satisfied with the paper. We also provide a moneyback guarantee if you don’t feel that your paper was written to your satisfaction. This guarantee is totally transparent and follows all the terms and conditions set by the company.
Read moreAll products that we deliver are guaranteed to be 100% original. We check for unoriginality on all orders delivered by our writers using the most advanced antiplagiarism programs in the market. We, therefore, guarantee that all products that we submit to you are 100% original. We have a zerotolerance policy for copied content. Thanks to our strict no plagiarized work rule, you can submit your homework to your professor without worrying.
Read moreTThis is one of the most cherished courtesy services that we provide to help ensure that our customers are completely satisfied with our finished products. Delivering the best final product to our customers takes multiple inputs. 111papers.com prides itself on delivering the best university homework help services in the writing industry. And, in part, our free revision policy is how we do it. What’s more, all our revisions are 100% free without any strings attached.
Read moreClient privacy is important to use. We know and understand just how important customers value their privacy and always want to safeguard their personal information. Thus, all the information that you share with us will always remain in safe custody. We will never disclose your personal information to any third party or sell your details to anyone. 111 Papers uses the most sophisticated, topoftheline security programs to ensure that our customers’ information is safe and secured.
Read morePlacing your order with us means that you agree with the homework help service we provide. We, in turn, will endear to ensure that we do everything we can to deliver the most comprehensive finished product as per your requirements. We will also count on your cooperation to help us deliver on this mandate. Yes, we also need you to ensure that you have the highestquality paper.
Read more