what effect does standardizing into z-score have on the shape of the distribution of a variable?

Q: Explain the assumption of homogeneity of variance?

A: Independent Two Samples t-test: Suppose there are two populations independent of one another. A…

Q: Explain the role of critical difference in Analysis of variance..

A: Explain the role of critical difference in Analysis of variance.?

Q: What does sample variance measures in F test?

A: F-test is used to test whether the observations in two groups have same variability. Let X1, X2, …,…

Q: How do you construct a residual plot using Statcrunch?

A: Regression analysis is a method of predicting the value for the one variable by the known value of…

Q: What is the z score of a normally distributed square?

A:

Q: What are three significant pieces of information we need to know to summarize a distribution?

A: The three significant pieces of information we need to know to summarize a distribution are as…

Q: Describe some of the reasons that group means might be different from each other in an analysis of…

A: What is ANOVA? Watch the video for an introduction, or read on below: An ANOVA test is a way to…

Q: rue of False? As the sample size of randomly selected samples increases, the distribution of the…

A: The statement is given.

Q: How is the normal curve important in psychological testing?

A: Here we have to explain how the normal curve important in psychological testing

Q: What is the benefit of modeling a random variable with a normal distribution

A: Here we have to give the reason for the benefit of modeling a random variable with a normal…

Q: How is the analysis of variance (ANOVA) specifically the F-Test, a signal to noise ratio?

A: ANOVA is a study which is non parametric. ANOVA stands for "Variance Analysis" and is used to…

Q: Explain the Sources of variability and F ratios in one- and two-factor ANOVAs.

A:

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: 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: What is the standard deviation around the least-squares line? Why is the denominator n-2?

A: Perceived Stress Telomere length 1 5 1.25 2 6 1.32 3 6 1.5 4 7 1.35 5 10 1.3 6 11 1…

Q: Explain the Multivariate Normal Distribution?

A:

Q: When we standardize using​ Z-scores, the shape of the distribution changes.   True…

A: Changing the values in z-scores does not change the shape of distribution. Clearly if values are…

Q: Explain when a random variable might be modelled using a Normal distribution, and give an example of…

A: Mathematically, Whenever a random variable is formed by adding a number of other individual…

Q: How is the shape of the F distribution affected by the degrees of freedom?

A: Given data How is the shape of F distribution affected by the degrees of freedom

Q: What z-score value separates the highest 10% of the scores in a normal distribution from the lowest…

A: We want to find highest 10% value for z score

Q: True or false: As the degrees of freedom decrease, the Student's tdistribution becomes more like the…

A: As the degrees of freedom decrease, the student's t-distribution becomes more like tends to the…

Q: what happens to the F-statistic if two variances are different?

A: The two variances are different hence the F-statistic are as follows,

Q: What is the z-score boundary for the bottom 2.5% of the distribution?

A: To find the z-score for the bottom 2.5% of the distribution.

Q: How do you find variance with only the standard deviation and number of values?How do you find…

A: Variance is square of standard deviation. So, if you are given standard deviation, then simply…

Q: What is the difference between a normal and binomial distribution?

A: Statistics uses normal distributions more often than binomial distributions most of the time.…

Q: How do I explain applying the normal curve to a set of test scores?

A:

Q: Describe about Sources of variability and F ratios in one- and two-factor ANOVAs.

A:

Q: What are the main characteristics of the normal distribution? Why is it advantageous to use the Z…

A: There are 2 types of probability distribution which are stated as follows:Continuous probability…

Q: What proportion of scores are above z-score of 1.0 in a normal distribution?

A: We want to find P(Z>1)= ?

Q: What are 6 real world applications of the two sample t test (equal variance)?

A: Two-Sample T-Test(equal variance) It is a hypothesis testing of the means of the two samples. It is…

Q: Can you explain how you find the p-value of the test statistic

A: The test statistic is -2.25 and the degrees of freedom is 80.

Q: How is it that estimates of variance can be used to test a hypothesis about means?

A:

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: Explain kurtosis of the distribution?

A:

Q: What z-score value separates the highest 70% of the scores in a normal distribution from the lowest…

A: Normal distribution is given.

Q: What are the predictor variables in general and what we can observe in general—normal distribution,…

A: Histogram: A simple bar graph of the data where the width bars are the range of the data and the…

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…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.