Which of the following can cause OLS estimators to be biased? PLEASE EXPLAIN

Q: Please indicate the dependent and independent variables in the following hypotheses. Consumers’…

A: Here we are talking about dependent and independent variables

Q: If you make α too small (e.g., α = 0.0000000001), what kind of error are you more likely to make?…

A: Assuming, Initially  α = 0.05

Q: What is meant by an influential observation?

A: The definition of an influential observation is give bas follows:

Q: What would an outlier look like on box plot

A: Box plot diagram or Whisker’s plot is a graphical method of depicting the data by quartiles and…

Q: How to prove the consistency, unbiasedness, and efficiency of the OLS estimator?

A: The estimator is said to be good if it satisfies the characteristics of the OLS estimator as…

Q: The median for the dataset used to create this histogram could possibly be in which range?

A: Frequency Distribution table : Class Frequency Cumulative Frequency 2-4 1 1 4-6 4 1+4=5 6-8…

Q: Which of the following can cause OLS estimators to be biased? PLEASE EXPLAIN 1. Heteroscedasticity…

A:

Q: would it make sense to say this is a correlational study because variables were not manipulated and…

A: There are two types of study involve in the survey, they are correlation and experimental study.…

Q: We can make a causal claim from the results of the chi-square test ? tru or false

A: False

Q: If the coefficient of correlation between two variables is -0.6, What is the coefficient of…

A:

Q: We want our estimators to be unbiased. True or False? O True O False

A: True

Q: Based on the data provided by the Environmental Protection Agency (EPA) in New York, we are…

A: State the null and alternative hypotheses for the above research question.

Q: A study wants to do research on whether or not the median age of social media users is getting…

A: The study seeks to investigate whether the average age of social media users is small or not. Data…

Q: If the Pearson correlation coefficient for two variables is 0.00 can we definitively say that no…

A: The Pearson correlation coefficient defined the relationship between two quantitative variables and…

Q: Show that Ti is unbiased estimator and Tz is biared estimator.

A:

Q: Which of the following can cause OLS estimators to be biased? PLEASE EXPLAIN

A:

Q: Define estimator ?

A: Estimator: Estimator is a statistic that estimates some facts of population. Estimator is a function…

Q: Your medical research team is investigating the mean cost of a 30-day supply of a certain heart…

A: The claim The mean cost is less than $100

Q: Establish a sufficient conditions for an estimator to be a consistent estimator.

A: ANSWER: For the given data,

Q: If two distinct values of the variate are given when is the covariance or coefficient of correlation…

A:

Q: How is censored cases handled in the KM estimator? Let's consider the median survival time in…

A: Survival Analysis: The name of the variable containing the time to reach the event of interest or…

Q: Is this histogram still skewed to the left even if there's a gap between the graph? Is there any…

A: On observing the graph we can see that the higher values have higher frequency. Even though there is…

Q: Assume that the correlation coefficient between the scores of a pre- and post- assessment that you…

A: 1. Correlation: A statistical method that is applied between the pairs of variables to check how the…

Q: Extrapolating may lead to wrong predictions

A: Given:  Extrapolation: The process in which you estimate the value of given data beyond its range is…

Q: Which of the following can cause OLS estimators to be biased? PLEASE EXPLAIN. A sample correlation…

A: OLS  i.e, ordinary least sqaure method is a process ofobtaining th estimates of unknown parameter in…

Q: A study of obesity and metabolic syndrome used data collected from 15 students, and included…

A: There is a high correlation between BMI and WEIGHT i.e. 0.964. It means that these two variables are…

Q: Before using these mean squares what does we must calculate?

A: Mean squares is nothing but the sum of the squares of the mean of the group   divided by the degrees…

Q: Bias in an estimator is associated with which of the following as relates to experimental data?

A: The bias of an estimator is the difference between this estimator's expected value and the true…

Q: What is negatively correlated?

A:

Q: s there a significant relationship between subject’s IQ and pre-test scores?α =.05, two tailed, if…

A: We perform a hypothesis test of the “significance of the correlation coefficient” to decide whether…

Q: What is the empirical rule?

A: The word 'empirical' stands for 'based on observations.  The 68–95–99.7 rule, also known as the…

Q: What can you say about the bias and efficiency of the following estimators by looking at the…

A: Given information: The data represents the boxplots of 3 datasets.

Q: A fictitious study was conducted in Davao City in 2012 about the relationship between fine dust and…

A: The given information can be summarized in a contingency table as follows:   CVD   Yes No…

Q: If it was found that two variables have a statistically significant relationship, we conclude that…

A: Correlation:   Correlation gives the information about strength of the association and direction of…

Q: Researchers compared the balance of a sample of elderly (E) patients with that of a separate sample…

A: Testing of Hypothesis: Testing of hypothesis is a rule which, when the sample values have been…

Q: what does it means that the variable are positively correlated?

A: Positive correlation is a courting among variables where in each variables circulate in tandem—that…

Q: Show that the estimator of Exercise 21 is consistent.

A:

Q: For what types of data do we use chi-square tests?

A: Given : Chi-square tests

Q: If an F statistic is negative, which of these statements is true?

A: F statistic

Q: Which of the following is an accurate definition for the power of a statistic test?

A: Power of a statistical test is the chance of rejecting the null hypothesis when the null hypothesis…

Q: Show that the estimates βˆ 1 = 1.572 and βˆ 2 = 1.357 used in the first experiment of Table 3.1 are…

A: Solution: yi xi xi^2 xiyi 4 1 1 4 5 4 16 20 7 5 25 35 12 6 36 72 Total = 28 16 78 131…

Q: Are there ever any circumstances when a correlation such as Pearson’s r can be interpreted as…

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

Q: ANOVA does the following EXCEPT: *

A: here compare given options with characteristics of ANOVA

Q: List two unbiased estimators and their corresponding parameters.

A: Unbiased estimators:An estimator is used to study the population whose parameters are unknown. An…

Q: "Power is higher with a one-tailed test than with a two-tailed test as long as the hypothesized…

A:

Q: Which are considered to be measures of centi tendency?

A:

Inverse Normal Distribution

The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.

Mean, Median, Mode

It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.

Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.