Solve Using Chi-Square Test of Independence:   Extracurricular Activity Participation By Grade Level .   We’ll perform a Chi-square test of independence to determine whether there is a statistically significant association between Extracurricular Activity Participation and grade level.

Q: What is the point estimate of the annual income of a salesperson with three years of college?  Test…

A: In the problem, we are given a regression analysis output related to the data under study.  Here, we…

Q: Test whether the correlation (without Northern Ireland) is statistically significant (i.e.,…

A: Test whether the correlation (without Northern Ireland) is statistically significant

Q: What do you need to look for in bivariate screening (for each categorical and quantative variables)?

A: Solution:Bivariate analysis helps to determine the relationship of two variables. The possible…

Q: buckles were found. Is there sufficient evidence to indicate that the percentage of defective…

A: It ia given that Sample size n = 200 Number of defectives, X = 12 Level of significance = 0.01

Q: How do you find the Ouartiles and the IQR?

A: Quartiles are values that divide the entire set of data into quarters. The different types of…

Q: How correlation coefficient is Independent of Units of Measurement?

A: Correlation: Correlation a measure which indicates the “go-togetherness” of two data sets. It can be…

Q: A researcher is To evaluate its effectiveness, she obtains a sample of four volunteers. She…

A: We have used the excel data analysis tool to run the ANOVA analysis.The output is as under:

Q: What does this information tell you about the variability of student's performance on the prelims?…

A:

Q: Where do p-values concentrate?

A: Under the null hypothesis H0 about the unknown distribution of the test statistic, the p value is…

Q: What is the mean squared error (MSE)?

A:

Q: Cosh Test

A: To test the convergence of cosnnn=1∞ For all real valued x, it is known that -1≤cosx≤1. Therefore,…

Q: What aspect does the repeated measure test decrease when compared to an independent t test?

A: Two samples are said to be independent if the sample values selected from one population are not…

Q: Outline the differences between paired and unpaired t-test with examples.

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: What are the Sign of correlation coefficient?

A: Correlation: Correlation a measure which indicates the “go-togetherness” of two data sets. It can be…

Q: When do you use the t-statistic and what is the advantage over the z-statistic?

A: Conditions for using t statistic: The t statistic is used in the hypothesis testing, for testing the…

Q: Go through the steps of ANOVA hypothesis testing to see if you can conclude that there difference…

A: Excel Procedure: Enter the data for Autistic, Normal and Mentally in Excel sheet>Go to Data…

Q: What does the variance of a random variable measure? What is the standard deviation of a continuous…

A: Variance of a random variable measures how far a set of (random) numbers are spread out from their…

Q: How do I solve for the mean, quartile 1 and 3?

A: To calculate the mean, median, mode, quartile 1 and quartile 2 of the given data, we should first…

Q: What does this information tell you about the variability of the student's performance on the…

A: Given The data is as follows:

Q: A colonoscopy is a screening test for colon cancer, recommended as a routine test for adults over…

A: Given values, p = 0.01n = 2602x = 12

Q: What does the one-sample chi-square test determine?

A: The Chi-square test used with one sample is described as a "goodness of fit" test

Q: How do you know when to use a z -test vs. t -test?

A: Z-tests are statistical calculations that can be used to compare the means of a sample's population.…

Q: What are the statistical techniques used to measure the dispersion? Give an example?

A: The statistical techniques which are used to measure the dispersion are variance, standard…

Q: how do i find quartile 1 in a set of data?

A: First quartile: The first quartile is the middle-most observation or median of the lower half of the…

Q: Why are t statistics more variable than z -scores?

A: t-statistics uses sample variance instead of population variance.   t statistics has both s and x̅.

Q: How do we do Z-test on a quantitative data? Give an example.

A: Z test

Q: cores are normally distributed with a mean of 100 and a standard devaition of 15.  What IQ score…

A: Given: μ=100σ=15

Q: How to find the variance, explain the formula

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Q: 2. Calculate your t-statistic.

A: We have given that  Sample mean = 88 Population mean = 85 Sample standard deviation = 7 Sample size…

Q: Provide an example of a research project in your hometown where the one-sample chi-square test would…

A: A chi square test is used to test the comparison between observed and expected results. The main…

Q: What is the formula for converting z score to original score?

A: Solution: Let X be the random variable. Suppose X has a mean µ and standard deviation σ. Then, the z…

Q: When do we use Chi2 Test, i.e. what statistic does it involve?

A: Chi-square test is used for Categorical Variables. It is used to test the significant difference…

Q: What are characteristics of a t test?

A: T-test: The t-test is used to check the significant difference between the two groups. By comparing…

Q: When do you need to calculate and use a Z - Score?

A: Z - score :  A z-score describes the position of a raw score in terms of its distance from the mean,…

Q: II. Solve for the variance and standard deviation.

A: Here given discrete probability distribution table for variable x

Q: The Chi-square test statistic (rounded off to two decimals) is:

A: Test is that whether the daily breakdown of commuting pattern of workers into the CBS have changed…

Q: Analysis of Variance can also be called as F-test. true or false?

A: As we know that analysis of variance which is ANOVA . In this we can calculate F - value which is…

Q: How does changing from two-tailed test to one-tailed test increases power of a statistical test?

A: Given: Hypothesis test changed from a one-tailed test to a two tailed test as given in the question.…

Q: How do you calculate z-score?

A: Formula to calculate z - score  z = x - μσ

Q: How to provide statistical interpretation of the coefficient, standard error, t-stat and p value of…

A: Regression Coefficient:The regression coefficient ​corresponding to a given explanatory variable can…

Q: explain the use of z-test

A: Solution-: Explain the use of z-test?

Q: A colonoscopy is a screening test for colon cancer, recommended as a routine test for adults over…

A:

Q: Explain how F-statistic has two types of degrees of freedom?

A: Introduction: Degrees of freedom can be defined as the number of values in an analysis, that can be…

Q: What is the chi-square test-statistic for this datas (2 decimals)

A:

Q: Suppose that you have created a contingency table comparing the restaurants that students ate at and…

A:

Q: When to use a chi- square test?

A: The chi-square test can be used to test the in the following scenarios: To test the Goodness of fit…

Q: what is homogeneity variance ? how does it influence students t

A: Given information: It is required to state homogeneity of variance.

Q: How do you caluculate F statistics and test at the 0.05 level of significance?

A: F-test is used to compare two variances. However F-statistic is used in a variety of tests including…