c) Find the mean and variance of flights delayed per hour.

Q: Describe the main measures of central tendency and dispersion. Why are they important in analyzing…

A: A measure of central tendency helps to identify the location of a dataset, whereas a measure of…

Q: very observation in a data set is multiplied by a constant k. What best describes the effect on…

A: Given : Every observation in a data set is multiplied by a constant k Let the observations be :…

Q: In calculating the mode for the grouped data, f, represents

A: In grouped data, the observations are clustered together into classes. The grouped data basically…

Q: When data is normally distributed the mean equals the median True False

A: Normal distribution

Q: An business reviews data on the daily amount of calls it receives. Are the data discrete or…

A: Discrete Variable: A variable which assumes only specified values within a given range is a discrete…

Q: Which distribution should be used to find the critical value/multiplier for a 98% confidence-…

A: From the given information we find the 98 % confidence interval.

Q: 1. What are the relative strengths and weaknesses of using range as a measure of variability?

A: To discuss: What are the relative strengths and weaknesses of using range as a measure of…

Q: 6. Mrs. Dante collects data on the entry fees to local zoos for a class field trip. All of the entry…

A: Mrs. Dante needs to use measures of central tendency and variability that are suitable for…

Q: When data is normally distributed the mean equals the mode. True

A: Normal distribution

Q: Explain the term variability (this is not asking for a definition).

A: Here we want to explain Variability.

Q: Distinguish briefly the Parameters and statistics

A: A parameters is a values that describes some aspect of a population . A parameters may be very…

Q: If 50 and 70 are the two elements of a population data set and their z-scores are -2 and 3,…

A: For  X=50, Y=70  Z score= -2 and 3 for point X and Y

Q: If there is a large amount of variation, then on average, the data values will be far from the mean.…

A: The given statement is 'If there is a large amount of variation, then on average, the data values…

Q: 5) What effect would adding a constant to each data value in a set have on the mean and variance of…

A: What effect adding a constant to each data value in a set have on the mean and variance of the set.

Q: What is the primary difference between a scatter plot and a "regular plot" (plt.plot)?

A: A scatter plot and a regular plot (plt.plot) are two different ways of visualizing data using the…

Q: A psychology student conducted a study on using a chief executive officer's facial structure to…

A:

Q: A report from the National Center for Health Statistics for 2010 showed that 20% of the adult…

A: The objective of this question is to find the average number of adult smokers in a sample of 25…

Q: What formula is used to find the standard error of mean?

A: we have to give correct formula to find standard error of mean.

Q: Describe about Variability within Groups.

A: There are two types of variability in ANOVA. They are, Between groups variability. Within group…

Q: The sum of squares of deviation is least if measure from а. Median b. Mean

A: the sum of squares of deviation is least when measured from ?

Q: Identify the most appropriate measure of variation corresponding to each of the following measures…

A: -

Q: 6. Which statistical tool studies the relationship between two or more variables? a. Median b. Range…

A:

Q: Describe about mean square between.

A: In ANOVA, “SS” stands for “sum of squares”, “df” stands for degrees of freedom, F is for the test…

Q: how do I describe the "measures of center and variability" of a chart?

A: The commonly used measures of center tendency are, Mean Median Mode In charts like histogram, the…

Q: 2). What is the major problem with using the Range as the measure of variability?

A: Range is measure of variability

Q: The variance is sometimes a negative number.

A:

Q: Make a histogram graph and make table of required data

A: Fromm the given question, Lets data be as follows below:

Q: What are the null hypothesis (H) and the alternative hypothesis (H,) that should be used for the…

A: Given Population Mean, μ=136 Sample Mean, x=130 Sample sd, s=15

Q: Explain what a box and whisker plot is and how we use it to understand central tendency and…

A: Box and whisker plot:A type of graph used to display patterns of quantitative data is called a…

Q: Describe the descriptive statistics between the two variables.

A: For  College GPA:-Mean=2.7307standard deviation =0.4296Minimum = 2.0800First quartile (Q1) =…

Q: 5.Identify the following as being discrete or continuous data. Explain.a. The average number of pets…

A: Discrete Data: Discreate data are those for which the number of data points are countable (finite or…

Q: The cumulative frequency below displays the amount of time (in minutes) taken to travel to work by…

A: From given graph we have to find median.

Q: For item 4 to 6. Table 3.8 shows the heights of a sample of 12 fathers and their oldest adult sons.…

A: Given data: Height of father (X) Height of son (Y) 65 68 63 66 67 68 64 65 68 69 62…

Q: 2. Find the median survival.

A: Let, X be the time to failure of transplanted kidney in months. Given, X follows Weibull…

Q: How to determine if a histogram has much variation or little variation?

A: A histogram is a graphical plot of numerical data using bars of different heights. It shows the…

Q: 2. State whether the variables described have a positive correlation, a negative correlat…

A: Correlation: If the change in one variable affects a change in the other variable, the variables are…

Q: the Measure of Central Tendency and Measure of Variability

A: Solution: measure of central tendency  : It give information about the central part of the…