Cashback Offer (20th - 30th September 2020). Get Flat 10% Cashback credited in your account on a minimum transaction of $80. Post Your Question

Question DetailsNormal
$ 29.99

BTM8107-8 week 2 understanding and exploring assumptions correct answers

Question posted by
Online Tutor Profile
request

BTM8107-8 week 2 understanding and exploring assumptions correct answers

1.Why do we care whether the assumptions required for statistical tests are met? (Tip: You might also want to write your answer on a note card you paste to your computer.)

2. Open the data set that you corrected in Activity #1 for DownloadFestival.sav. You will use the following variables: Day1, Day2, and Day3 (hygiene variable for all three days). Create a simple histogram for each variable. Choose to display the normal curve (under Element Properties) and title your charts. Copy these plots into your Word document.

3. Now create probability-probability (p-p) plots for each variable. This output will give you additional information. Read over the Case Processing Summary. Notice that there is missing data for Days 2 and Day 3. Copy only the Normal p-p Plots into your Word document (you do not need to copy the beginning output nor the Detrended Normal p-p Plots).

4. Examining the histograms and p-p plots, describe the dataset with particular attention toward the assumption of normality. For each day, do you think the responses are reasonably normally distributed? (Just give your impression of the data.) Why or why not?

5.Using the same dataset and the Frequency command, calculate the standard descriptive measures (mean, median, mode, standard deviation, variance and range) as well as kurtosis and skew for all three hygiene variables. Paste your output into your Word document (you do not need to paste the Frequency Table). What does the output tell you? You will need to comment on: sample size, measures of central tendency and dispersion and well as kurtosis and skewness. You will need to either calculate z scores for skewness and kurtosis or use those given in the book to provide a complete answer. Bottom line: is the assumption of normality met for these three variables? Does this match your visual observations from qu estion #1?

6. Using the dataset SPSSExam.sav and the Frequency command, calculate: the standard descriptive statistics (mean, median, mode, standard deviation, variance and range) plus skew and kurtosis, and histograms with the normal curve on the following variables: Computer, Exam, Lecture, and Numeracy for the entire dataset. Complete the same analysis using University as a grouping variable. Paste your output into your Word document (you do not need to paste the Frequency Table). What do the results tell you with regard to whether the data is normally distributed?

7. Using the dataset SPSSExam.sav, determine whether the scores on computer literacy and percentage of lectures attended (with University as a grouping variable) meet the assumption of homogeneity of variance (use Levene’s test). You must remember to unclick the “split file” option used above before conducting this test. What does the output tell you? (Be as specific as possible.)

8. Describe the assumptions of normality and homogeneity of variance. When these assumptions are violated, what are your options? Are there cases in which the assumptions may technically be violated, yet have no impact on your intended analyses? Explain.

Available Answer
$ 29.99

[Solved] BTM8107-8 week 2 understanding and exploring assumptions correct answers

  • This Solution has been Purchased 3 time
  • Average Rating for this solution is A+
  • Submitted On 13 Jul, 2015 04:53:01
Answer posted by
Online Tutor Profile
solution
1..Why do we care whether the assumptions required for statistical tests are met? (Tip: You might also want to write your answer on a note card you paste to your computer.) Assumptions are needed to draw accurate conclusions about reality test Different assumptions are made for various statistical models and in order for models to reflect reality accurately; their assumptions need to be true. If assumptions are broken, accurate conclusions cannot be drawn about the data distribution. Therefore, part of the data process involves checking to make sure that your data doesn't fail this assumption. 2. Open the data set that you corrected in Activity #1 for DownloadFestival.sav. You will use the following variables: Day1, Day2, and Day3 (hygiene variable for all three days). Create a simple histogram for each variable. Choose to display the normal curve (under Element Properties) and title your charts. Copy these plots into your Word document. 3. Now create probability-probability (p-p) plots for each variable. This output will give you additional information. Read over the Case Processing Summary. Notice that there is missing data for Days 2 and Day 3. Copy only the Normal p-p Plots into your Word document (you do not need to copy the beginning output nor the Detrended Normal p-p Plots). 4. Examining the histograms and p-p plots, describe the dataset with particular attention toward the assumption of normality. For each day, do you think the responses are reasonably normally distributed? (Just give your impression of the data.) Why or why not? Answer: For the variable “Day 1”: From the histogram of the variable Day 1 we see that the histogram of day 1 looks like normal distribution but it’s curve is slightly above the normal curve so it is leptokurtic and since the normal curve and data distribution curve is approximately same therefore data distribution is symmetric hence the data distribution is approximately symmetric normal distribution with kurtosis is leptokurtic. Also from the P-P plot of the data distribution we see that the data points are lying around the straight line therefore it is normal distribution. For the variable “Day 2” From the histogram of the variable Day 2 we see that the histogram of day 2 looks like normal distribution but the maximum no of data points concentrate left of the normal curve therefore the data distri...
Buy now to view the complete solution
Other Similar Questions
User Profile
NUMBE...

BTM8107-8 Week 6 Apply Repeated-Measures

Exploratory data analysis Student’s name Professor’s name, Course title Date 1. Exploratory Data Analysis. a. Perform exploratory data analysis on the relevant variables in the dataset. When possible, includ...
User Profile
NUMBE...

BTM8107-8 WEEK 3

Activity #4 You will submit one Word document for this activity. You will create this Word document by cutting and pasting SPSS output into word. Please answer the questions first and include all output at the end of the acti...
User Profile
vpqnr...

BTM8107-8 week 2 understanding and exploring assumptions correct answers

1..Why do we care whether the assumptions required for statistical tests are met? (Tip: You might also want to write your answer on a note card you paste to your computer.) Assumptions are needed to draw accurate conclusions ...
User Profile
Exper...

BTM8107-8 | Week: 3 | Activity: Explore Correlation and Regression | Rated A+

We have used a two-tailed test to test the significance of the correlation coefficients. In the above table if Sig. (2-tailed) is less than 0.05 then correlation coefficient corresponding to those two variables is signific...

User Profile
Exper...

BTM8107-8 | Week: 7 | Activity: Apply Non-Parametric Tests | Rated A+

parametric test is preferred over parametric tests.
2. Nonparametric tests are ideal when the sample size is small. If data set is larger than 100 then it non-parametric tests should not be used, as sample mean will f...

The benefits of buying study notes from CourseMerit

homeworkhelptime
Assurance Of Timely Delivery
We value your patience, and to ensure you always receive your homework help within the promised time, our dedicated team of tutors begins their work as soon as the request arrives.
tutoring
Best Price In The Market
All the services that are available on our page cost only a nominal amount of money. In fact, the prices are lower than the industry standards. You can always expect value for money from us.
tutorsupport
Uninterrupted 24/7 Support
Our customer support wing remains online 24x7 to provide you seamless assistance. Also, when you post a query or a request here, you can expect an immediate response from our side.
closebutton

$ 629.35