If you calculate the sample covariance between two variables X and Y equals one, then there must be a strong linear relationship between the variables* True False

Q: What statistical analysis correctly analyzes the independent measure ( also known as in between…

A: Here we can say that for independent measures we use t-test for one sample and t-test for two…

Q: A: 16,17, 25, 26, 32, 34, 38, 40, 42, B: 14,16,24,28, 32, 35, 37, 42, 43, 45, 47 Test whether two…

A: Hypothesis testing is a statistical test to check whether the claim about the population parameter…

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: Many economic and business measures such as sales, investment, consumption, costs, and revenues can…

A: Discrete Random Variable: A random variable is a variable which is countable in an infinite amount…

Q: The sample mean x is a point estimate for the population mean u. In tests of significance, it is…

A: The sample mean is defined as an average computed on the basis of sample evidence. Population means…

Q: Which of these comparisons between an ANOVA and a t test is correct?   An ANOVA can be used to…

A: ANOVA decides whether three or more populations are statistically different from each other, while…

Q: What are the assumptions for a paired difference experimental design?

A: In paired experimental design, each study unit contributes a pair of observations which implies…

Q: Discuss how to identify dependent and independent samples and present examples in your discussion.…

A: Dependent samples will have paired observations the two samples are related to each other and…

Q: If the distribution of the data is Normal, then... 1 the Empirical Rule can be applied. 2 the…

A: Normal distribution: It is bell-shaped and symmetric distribution.   Empirical Rule: The Empirical…

Q: What is the difference between two samples that are dependent and two samples that are independent?…

A:

Q: How can the sample covariance be used to estimate the covariance of random variables?

A: The covariance is used to measure the relationship between two random variables, that is, to what…

Q: The coefficient determination indicates: the scores of each case in a sample simultaneously on two…

A: We have to find corrcet answer.

Q: An analysis of variance is used to compare the differences in for more than 2 populations. O…

A: According to the given information in this question. We need to identify the missing term from the…

Q: Explain when the empirical rule can be used to help describe data in a population or sample,…

A: The empirical rule for a normally distributed random variable is as follows: Approximately 68% of…

Q: How to calculate the sample correlation and covariance

A: Covariance and correlation are used to measure the linear relationship between two or more…

Q: The sample correlation coefficient is an estimator of the population correlation coefficient and…

A: Note: Hi there! Thank you for posting the question. As there are several independent questions,…

Q: Why sample covariance and correlation is used for?

A: Co-variance and correlation measure linear relationship between the variables.   Sample co-variance:…

Q: What distribution is used in this chapter to make inferences for two population standard deviations?

A:

Q: 3. What is the test variate used when the population variance is unknown and when the population…

A: There are two tests used for testing the population mean i.e. t-test and z-test. The t-test is used…

Q: Prachi rolls a die a number of times and records her outcomes in a bar graph as shown in Figure…

A: From the graph, the frequency of getting each number in the die is given in the table form below.…

Q: How to differentiate dependent and independent samples?

A: It is a subset of the population. In other words, it is a representative part of the population.

Q: Even if a treatment has an effect, it is still possible to obtain a sample mean after the treatment…

A: In any hypothesis testing, we fix null and alternative hypotheses then follow the testing procedure…

Q: 3)   In a paired samples t test, explain the logic of difference scores (why do you need to find…

A: Given A paired samples test with difference score and μ as  0 We considered population mean to be μ

Q: Last school year, the student body of a local university consisted of 35% freshmen, 25 % sophomores.…

A: Claim : significant change in % of students for each classification for this year as compared to…

Q: If a researcher takes a large enough sample, he/she will almost always obtain: practically…

A: Sample size is an important consideration for any study.  Larger sample sizes provide more accurate…

Q: Why do the study on the data variability is called as the complementary to the study on central…

A: Central tendency is the tendency of the quantitative data set to cluster around the some central…

Q: Participants enter a research study with unique characteristics that produce different scores from…

A: Solution

Q: 1. What estimator and statistical test should you use to test  is survival curves of two groups are…

A: As per our company guidelines we supposed to answer only 1st question. please repost another to get…

Q: Should be consider this score unusual? What is the value of the test statistic?

A:

Q: what test is used to determine whether two population means are different when the variance are…

A: The test that is used to determine if the two population means are different when the population…

Q: According to the JPM Riskmetrics analysis report, the return on a UK-based portfolio is bigger than…

A: A t test can be used to test the claim that the population mean is equal to the claimed value or…

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: The right statistical test to use when testing for the mean of two dependent populations is the…

A: We have to find out the statement is true or false..

Q: True or false: In order to use the unpooled t-test, we need to assume that the two population…

A: In order to use the unpooled t-test, we need to assume that the two population variances are…

Q: Having outliers in our data may affect the IQR but the sample range is unchanged True False

A: The sample range is defined as Range = Max - min. And the IQR is calculated as IQR = Q3 - Q1

Q: The dependent is variance inflation factor, make a decision whether it need to drop any variables.

A: Given information: The output of multiple linear regression model is given.

Q: We use information about populations to make conclusions about our samples. * TRUE FALSE

A: Given statement :  We use information about populations to  make conclusions about our samples

Q: - How do you know if a sample is significant different from the population mean? In other words,…

A: Let μ be the population mean of the sample we are taking and μ0 be the hypothesised population mean…

Q: What are examples of situations in independent sample t-test vs. Paired sample t-test between two…

A: There are two types of data, one is independent variable and another is dependent variable.…

Q: If we reject the null hypothesis, Ho: p=0, what can we conclude about the population correlation…

A: The test hypothesis are, H0: ρ = 0 H1: ρ ≠ 0. This is a two-tailed test.

Q: What is omitted variable bias?

A: The omitted variable bias is very useful concept in the statistics. A type of the selection bias…

Q: How to get rid of co-variances double head arrows among the demographic variables in semplot…

A: R- lavaan is an open-source package in R programming for latent variable modelling.

Q: Tracking Signal is used to determined if the forecaste bias is within limit or not True or False ?

A: Tracking signal is used to check the quality of forecasting model.

Q: What do you mean by Omitted Variable Bias? explain when omitted variable bias occurs?

A: Omitted variable bias is the bias that arise when the regressor, X, is associatedwith an omitted…

Q: The mean and variance of marks of BSCS Section A are 62 and 16 respectively and that of BSSE Section…

A: Given, Section A mean,X1¯=16variance= 62standard devaition = variance=4sample size,n1=30 Section B…

Q: Over repeated samples, the sample mean is considered a random variable. Is this statement TRUE or…

A: Sample mean: It is the sum of n sample observations divided by the total number of observations in…

Q: College Entrance Exam shows that the scores are normally distributed with a mean of 125 and a…

A: We have to use Z score to solve the questions

Q: The area of inferential statistics called hypothesis testing is a decision-making process for…

A: Introduction: Inferential statistics is the branch of statistics, that is involved in making…