Is this numerical summary a measure of center or variability? Is this numerical summary best to use for data with symmetric or skewed distributions? Is this numerical summary resistant to outliers or skewness? Mean Standard Deviation Median IQR

Q: What is a frequency distribution of qualitative data and why is it useful?

A: Frequency distribution: Sometimes an event will be occurred two or more times, the number of…

Q: In the left skewed data distribution: Mean < Median < Mode Select one: True False

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Q: How does an outlier affect the mean absolute devlation?

A: Mean absolute deviation is calculated using the formula: MAD = ∑xi - x¯n xi = Input data values x¯ =…

Q: which measure of central tendency mean or median best describe the center of the distribution and…

A: Given query is to find the measure which is best to describe center of the distribution.

Q: Which of the following measure of central tendencies may not always provide the estimate of central…

A: Solution: Mean: It is a measure of central tendency and is the defined as the ration of sum of all…

Q: 2. Find a. Range b.. Mean absolute deviation (MAD) c. Sample standard deviation and d. Variance from…

A: Given information: The data for the class interval and frequency is given.

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: Define how to use t-Statistic in Regression When the Sample Size Is Small? Explain Use of the…

A: The t statistics is divided by its standard error coefficient. The default error is an approximation…

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

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Q: In the left skewed data distribution: Mean < Median < Mode Select one: True • False

A: Introduction -   Left skewed data distribution - In statistics , a negatively skewed also known as…

Q: What are the shapes of these distributions? Are they symmetric, left, or right skewed? Are there any…

A: Introduction A box and whisker plot is a graphical representation which shows the variation in the…

Q: What is Frequency Distribution for Grouped Data?

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Q: As the true population mean moves away from the hypothesized mean, the power of the test decreases.…

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Q: Explain the Multivariate Normal Distribution?

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Q: Does the distribution of sample variances tend to be a normal distribution

A: The shape of the sample distribution of sample variance will depend on the shape of the population…

Q: Define and explain the relevance of kurtosis, skewness and standard deviation as descriptive…

A: Kurtosis It is measure of tailedness Skewness It is measure of symmetry SD It is measure of…

Q: What is a frequency distribution? Explain how these differ if we are using qualitative data versus…

A: Frequency distribution- Frequency distributions are visual displays that organise and present…

Q: How do I determine standard deviation of an average score?

A: Solution: Let X be the score and n be the sample size. Standard deviation of scores should be known…

Q: It is never ethical to throw out an outlier datum present in a dataset. True False

A: Introduction An outlier is an extreme data value. It can be extremely low or extremely high.

Q: Which of the following does NOT reveal the variation (spread) of the data? Check all that apply.

A: Measures of central tendency: The measures of variability measures the centre of the data. Some of…

Q: Determine the distribution of the data pictured below Uniform Bell-shaped Skewed-right Skewed-left

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Q: Describe the sources of within groups variance. How does within groups variance affect the range of…

A: Given information: It is required to describe the sources of within groups variance.

Q: A random sample of 15 college students were asked "How many hours per week typically do you work…

A: The data given is shown below 7 8 16 19 11 31 5 12 14 8 3 12 17 29…

Q: Which are considered to be measures of dispersion, or "measures of spread?" median mean standard…

A: Measure of dispersion are those measure the scatteredness inside the data.

Q: Which one is not measuring the degree to which the scores in a distribution are spread out or…

A: Variance is a measure of dispersion. It measures how far each observation falls from the mean of the…

Q: The observed value "sample mean" is an estimate of the population mean. True False

A: Given statment is The observed value " sample mean " is an estimateof the population mean.

Q: Explain why the standard deviation is a useful sample statistic

A: Our aim is to explain why the standard deviation is a useful sample statistic

Q: A box-and-whisker plot does not show the

A: This is a question of theoretical distribution and Box Plot.

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

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Q: The spread or variation in the sampling distribution of means is called the                 of the…

A: Spread or variation in the sampling distribution of means is given.

Q: How does the normal curve allow behavioral scientists to compare different types of scales, tests…

A: First understand normal curve : For normal curve,  the curve is bell-shaped and symmetrical. Zero…

Q: what is the standard error (usually standard error of the mean)?

A: Standard error: The standard error of the statistic is defined as the standard deviation of its…

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 we quantify the amount of sampling variation

A: The quantifying the amount of Sampling Variation for given example. First of all, we understand what…

Q: what is the distribution of sample means exactly? Why are sample characteristics important in…

A: As per central limit theorem- The distribution of sample means, also known as the sampling…

Q: Which measure of central tendency  can be used to describe a distribution at any level of…

A: Nominal level: mode Ordinal level: mode, median Interval level: mode, median, mean