I need help understanding how to do this.  What's the mean annual return of the S&P 400 Midcap Index over the past 7 years? What's the standard deviation? What's the mean annual return of the NASDAQ-100 Index over the past 7 years? Calculate a coefficient of correlation of the two indexes' return. Explain what may be causing the changes in the indexes' return over the past 7 years.

Q: What would be a potentially better alternative to using standard error and standard deviation as the…

A: Standard Deviation : The standard deviation(SD) measures the amount of variability, or dispersion…

Q: Why is the standard deviation used more frequently than the variance as a measure of variability?

A: The standard deviation and variance, are measures of dispersion (variability).  The relation between…

Q: what percent of the data falls within 2 standard deviations of the mean?

A:

Q: What do the mean deviation, variance and standard deviation all have in common? How is this common…

A: Mean deviation, standard deviation and variance all measure the spread of the distribution.Mean…

Q: Why is the range much less informative (and much less useful) as a measure of variability than the…

A: Solution-: The problem with using the range as a measure of variability is that it is completely…

Q: What is an example of when you might want a large standard deviation? That is, data that is more…

A: Example -1 See in a factory, we require all types of people from labor to top officials of…

Q: Does a small standard deviation signify more or less uncertainty in the data ? Explain.

A:

Q: How do we calculate standard deviation?

A: Standard Deviation A number that expresses how much the members of a group deviate from the group's…

Q: If each score is increased by 25, what will be the mean and standard deviation of the distribution…

A: Given that  The distribution of raw scores on particular achievement test Mean = 500 Standard…

Q: the measure of variability that is influenced most by extreme values is

A: The range is the measure of dispersion or variability. The range can be calculated as: Range…

Q: Why should you be cautious when interpreting a correlation?

A: cautious when interpreting a correlation

Q: Illustrate the mean or expected value, variance and standard deviation

A: given: x f xf (x- x )2 f*(x- x )2 4 1 4 25 25 5 2 10 16 32 8 2 16 1 2 10 2 20 1 2 13 2…

Q: What is the difference between standard deviation and mean?

A: Standard deviation: The standard deviation is based on how much each observation deviates from a…

Q: Approximately what percentage of normally distributed data will fall within 2 standard deviations…

A: Based on the Concept of Empirical Rule: About 68% of the area under the curve falls within 1…

Q: Discuss why there is regression toward the mean in the correlation between the earnings of parents…

A: Answer: The correlation between earning of parents and children is represented by intergenrational…

Q: Do you agree that the standard deviation can measure variable relationships? Explain

A: The term standard deviation was introduced by karl pearsons in 1893. It is one of the most commonly…

Q: explain the variability that happens during normal distribution and why it happens.

A:

Q: Why is the standard deviation important? Give specific examples to illustrate your understanding.

A: Standard deviation is the measure of the amount of dispersion of a set of values A lower standard…

Q: Is there a significant linear correlation between consumption and price? Use 0.05 level of…

A: Given: Consumption Price 0.386 1.35 0.474 1.5 0.393 1.39 0.425 1.49 0.406 1.36 0.344…

Q: What are the best ways to find the standard deviation?

A: Standard deviation is a measure of variability. It describes how far the data falls from the…

Q: How does one calculate the standard deviation?

A:

Q: What is the effect of outliers on the value of correlation?

A: An outlier is a score that falls beyond the limits of the scores remaining on the scatter map. For…

Q: What would be the combined monthly credit card bill standard deviation (in dollars)? How do I…

A: here we need to compute the combined monthly credit card bill standard deviation. Here the first…

Q: How do i do standard deviation?

A: Standard deviation is use to measure the dispersion of data points from the mean. There are two…

Q: The playing life of a Sunshine radio has a Normal distribution with a mean of 600 hours and a…

A: The playing life of a radio is normally distributed with mean 600 hours and standard deviation of…

Q: Why should one be cautious when interpreting a correlation?

A: Why should one be cautious when interpreting a correlation?

Q: Explain the effect of the standard deviation on power?

A: Six ways to increase the power for the study: Increasing effect size by increasing difference…

Q: Why should researchers taught to be cautious when interpreting a correlation?

A: Correlation is a measure in statistics that is used to measure the strength of linear relationship…

Q: In words, explain what is measured by SS, variance, and standard deviation

A: The sum of squared deviations, , is also known as the sum of squares or SS. The number of squared…

Q: What is Regression toward the Mean?

A:

Q: Do you agree that standard deviation can measure variable relationships?

A: Yes, Standard deviation can measure variable relationships.

Q: 5. For the trend line in Exercise 3, what would the expected temperature be after 2 hours? Explain…

A: Correlation of a scatter plot means how y value is Changing with respect to the change of x value.…

Q: We calculate the central tendency and variability in order to provide a summary of a data set. Why…

A: While central tendency tells you where most of your data points lie, variability summarizes how far…

Q: How does the slightly different perspective make the standard deviation even more accessible?

A: Standard deviation: It is a measure of how far each observed value is from the mean and standard…

Q: What relation exists between the average deviation of the mean?

A: Note: Hi there! Thank you for posting the question. As your question is not clear, as per the…

Q: What is the Importance of Variability?

A:

Q: Do researchers prefer to report the variance instead of the standard deviation because it is easier…

A: No, researchers prefer using standard deviation because standard deviation is in the same units as…

Q: What is the Standard Deviation and the Percentage that falls within the 1 Distance of Standard…

A: N=30 for the given data  First we will calculate mean  We have to calculate standard deviation and…

Q: why is one standard error unit not a good choice for the error bars that relate to the trendline?

A: The error bars usually represent the variability of the data or uncertainty. The standard error tell…

Q: When you have significant results in data analysis, it is not necessary to report all relevant means…

A: Statistical significance is the likelihood that the difference in conversion rates between a given…

Q: The playing life of a Sunshine radio has a Normal distribution with a mean of 600 hours and a…

A: The playing life of a radio is normally distributed with mean 600 hours and standard deviation of…

Q: I need help with understanding standard deviation.  How to calculate it from the mean?

A: The standard deviation describes the spread of the data distribution from the mean of the given data…

Q: Define Test a correlation for significance?

A: Test for correlation: The test for correlation is used to compare the sample correlation coefficient…

Q: Explain the difference between variance and standard deviation? how it is calculated?

A: Variance Standard Deviation It is average of squared deviations It is root mean squared deviation.…

Q: When you have significant results in data analysis, it is customary to report all relevant means and…

A: Data Analysics is a process of inspecting, cleansing, transforming, and modeling data with the goal…

Q: What is the relationship between the standard deviation and variance?

A: