Standard deviation

What is the median salary for men in this sample?What are the mean and standard deviation of salaries for women?

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Statistic Problem The following data are based on numbers taken from the Bureau of Labor Statistics surveys from the year 2019 ( https://www.bls.gov/cps/aa2019/cpsaat39.htm ), for community, service, social science, and education occupations. They represent the average weekly pay for wage and salary earners measured during 2019 and broken down by gender. Enter these data into … Read more

Calculate the mean, standard deviation, skew, 5-number summary, and interquartile range (IQR) for each of the variables.

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Statistics Analysis. Insert a new column in the database that corresponds to “Annual Sales.” Annual Sales is the result of multiplying a restaurant’s “SqFt.” by “Sales/SqFt.” Calculate the mean, standard deviation, skew, 5-number summary, and interquartile range (IQR) for each of the variables. Create a box-plot for the “Annual Sales” variable. Does it look symmetric? … Read more

What duration should be used in your schedule if you want to ensure 95% confidence that the activity’s duration will not be exceeded?

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Scheduling and Planning Historic records show that the mean duration of an activity is expectedto be 8 days with a standard deviation of 2.4 days. a) What duration should be used in your schedule if you want to ensure 95% confidence that the activity’s duration will not be exceeded? b) What it the probability that … Read more

If you have categorical, ordered data such as low income, middle income, high income what type of measurement would you have? Why?

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MEASUREMENT AND DESCRIPTIVE STATISTICS Respond to the following short answer questions from Chapter Three in the Morgan, Leech, Gloeckner, & Barrett textbook: If you have categorical, ordered data such as low income, middle income, high income what type of measurement would you have? Why? (a) Compare and contrast nominal, dichotomous, ordinal, and normal variables. (b) … Read more

Statistics Analysis: calculate the mean, standard deviation, skew, 5-number summary, and interquartile range (IQR) for each of the variables.

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Statistics Analysis In preparation for writing your report to senior management next week, conduct the following descriptive statistics analyses with Microsoft® Excel®. Answer the questions below in your Microsoft® Excel® sheet or in a separate Microsoft® Word document: Insert a new column in the database that corresponds to “Annual Sales.” Annual Sales is the result … Read more

Frequency and standard deviation: explain what the coefficient of variation is.what is the advantage of using it compared to standard deviation?

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Frequency and standard deviation. 1. For a dataset, without constructing of the frequency distribution table; how to obtain the class width of frequency distribution table if the number of classes is given? (2pts) Note: Use the formula in the slides; here frequency distribution table is not provided. 2. Explain the difference between a frequency distribution … Read more

What is the probability that a z-score is more than -1.0 rounded to four decimal places?

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What is the probability that a z-score is more than -1.0( rounded to four decimal places)? What is the probability that a z-score is less than -2.25 (Rounded to four decimal places)? If IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. what is the mean IQ score … Read more