Can the empirical rule be used on any population, why or why not?

Q: _________are computed to show cause and effect relationships and to test hypotheses and scientific…

A: Causation indicates the relationship between two events where one event causes another event to…

Q: A statistical procedure in determining which hypothesis is more acceptable as true or which…

A: HERE USE basic  hypothesis testing

Q: If nothing else changed besides an increase in sample size, the test statistic  would be *fill in…

A: The test statistic: A function of sample observations that are used to test H0 is called a test…

Q: Does statistically different indicate substantially different? Why or why not?

A: No, statistically different does not indicate substantially different. These two are different…

Q: Why does a large value of the F statistics provide evidence against the null hypothesis?

A: We use F-statistic (F ratio) when we are comparing the group means like ANOVA test for for more than…

Q: What is the test statistic?

A: At Rachel's 11th birthday party, B-girls were timed to see how long ( in seconds ) they could hold…

Q: Could you please help me understand the difference between a z-test and a t-test for in statistics?

A: Both the tests are useful to test the significance of means.Both the tests are assume a normal…

Q: What condition on a data set is required to apply the empirical rule?

A: The condition that required to apply the empirical rule is that the shape of the data should be…

Q: The alternative hypothesis for an ANOVA states that

A: ANOVA: In one factor ANOVA model only one factor is studied, that is only the effect on one factor…

Q: What is a T-Test? How is it applied to a Single Population Data Set?

A: Student's t-test was given and first used by W.S. Gosset in 1908. The statistician W.S. Gosset is…

Q: How can human bias influence data used to test hypothesis?

A: We have to write How can human bias influence data used to test hypothesis.

Q: What is meant by a result being statistically significant?

A: There are mainly two important things in any research. Practical significance and statistical…

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: A researcher wanted to know if there is an association between exercise and sleep for the population…

A:

Q: Do sports drinks help prevent cramps in endurance sports? At the end of a marathon, officials will…

A: Observational study: In observational study, the individuals of the study are observed by the…

Q: Suppose that you have bivariate data for a sample of a population. a. How would you decide whether…

A:

Q: What is the statement regarding a population parameter formulated for the sole purpose of being…

A: A hypothesis test.

Q: Why is it important to know what type of statistical test should be run before data is collected?

A: It is important know what statistical test should be run before data is collected to ensure data…

Q: What is the difference between testing hypothesis on a population and testing hypothesis when…

A: Statistical hypotheses testing:   Hypotheses testing is used to make inferences about the population…

Q: If a difference is not statistically significant, should you conclude that the two populations are…

A:

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: whats a statistical hypothesis?

A: Hypothesis: Hypothesis is an assumption about the parameter of the population which will be made on…

Q: Suppose that you have bivariate data for an entire population. a. How would you decide whether an…

A:

Q: What does it mean that a sample statistic is an unbiased estimator of a population parameter?

A: A statistic is called an unbiased estimator of a population parameter if the mean of the sampling…

Q: What information is provided by calculations of the “F” test statistic?

A:

Q: A recent study examined the drinking behaviors of undergraduate college students (male and female…

A: Null Hypothesis is :  (That is, there is no significant difference in the drinking habits of males…

Q: in statistical inference, a sample ............ is referred to as the point estimator of the…

A: Point estimate : A point estimate of a population parameter is a single value of a statistic. For…

Q: If the difference in means of two data sets is not zero, does that imply that on average the two…

A: In this we need to find whether the difference in means of two data sets is not zero, the does it…

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: If the variability between the different sample means taken from the same population is small, we…

A: If the variability between the different sample means taken from the same population is small, we…

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: When should the Empirical Rule be used?

A: Empirical rule provides percentages of observation that will lie within 1 SD, 2 SD and 3 SD.

Q: Is there sufficient evidence or not to conclude that there is a linear correlation between brain…

A: The P-value is 0.265.

Q: Explain how the average causal effect for a given population can be estimated by using an ideal…

A: Causal effect may be different for different individuals and it is not possible to measure the…

Q: Prove an efficient estimator for the average of a normal population

A: X~ Normal with mean= mu and variance= sigma^2 Find efficient estimator for the mean

Q: What is another name for the empirical rule? Why is that name appropriate?

A:

Q: Why is the empirical rule useful?

A: The empirical rule, which states that nearly all data will fall within three standard deviations of…

Q: What is a confidence interval in statistics?

A: In inferential statistics, the two types of estimation are: point estimate and confidence interval…

Q: A point estimate consists of a single sample that is used to estimate the true population parameter.

A:

Q: What are some of the most basic statistic formulas used in excel for the Hospitality carrier field?

A: Some of the basic formulas are given as mean, median, mode, quartiles etc

Q: Is this study experimental or observational? Justify.

A: In the study given , The people have been divided into groups to determine the effect of Vitamin E…

Q: If the condition for using the empirical rule is met, why should that rule be used instead of…

A: The Chebyshev’s rule will estimate a minimal percentage, whereas the empirical rule gives almost the…

Q: Explain two reasons why the research hypothesis is not tested directly.

A: the null hypothesis is a neutral statement about a population parameter that is never proved or…

Q: When do you consider a person to be statistically literate?

A: From the given information we find solution

Q: _________ are used to display actual data points for individual-level data. Would this answer be…

A: Univariate Statistics:Univariate data is that the data information is depends on only one random…

Q: What is the Standard test statistic?

A: Hypotheses:

Q: Define the term Penal data?

A: Panel data is useful in mainly econometrics and statistics. It is also called as longitudinal data.…

Q: What does the word 'quartile' mean?

A: Quartiles are the values that divide a list of numbers into quarters: Put the list of numbers in…

Q: Even if a treatment has no effect, it is still possible to obtain an extreme sample mean that is…

A: According to the provided information, if a treatment has no effect, the extreme sample mean that is…

Continuous Probability Distributions

Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.

Normal Distribution

Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!