Quiz - 01

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Lamar University *

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Statistics

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Feb 20, 2024

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Quiz- 01  Question 1 1.75 out of 1.75 points The median of a data set with 30 values would be the average of the 15 th and the 16 th values when the data values are arranged in ascending order. True  Question 2 0 out of 1.75 points A sample of 8 observations with a sample standard deviation of 2.50 has a sample variance of 17.50… . True  Question 3 1.75 out of 1.75 points Which measure of variability is defined as the maximum value of a data set minus the minimum value of a data set? b. Range  Question 4 0 out of 1.75 points In an extremely right-skewed distribution, the mean is less than the median. False  Question 5 1.75 out of 1.75 points The value of the mean times the number of observations equals the sum of all of the data values. True  Question 6 1.75 out of 1.75 points There are four quartiles that divide the values in a data set into four equal parts. True  Question 7 1.75 out of 1.75 points Where will you find "time" on a time series graph? b. horizontal axis  Question 8 1.75 out of 1.75 points The median is one of the most frequently used measures of variability. False  Question 9 1.75 out of 1.75 points The length of the box in the box plot portrays the- b. interquartile range.  Question 10 1.75 out of 1.75 points The difference between the first and third quartile is called the

c. interquartile range.  Question 11 1.75 out of 1.75 points If the number of observations in a single-variable data set is even, the median is the – c. average of the two middle observations.  Question 12 0 out of 1.75 points A histogram is used to display categorical data. True  Question 13 1.75 out of 1.75 points A population includes all elements or objects of interest in a study, whereas a sample is a subset of the population used to gain insights into the characteristics of the population. True  Question 14 1.75 out of 1.75 points Which statement is true for the following data values: 7, 5, 6, 4, 7, 8, and 12? c. The mean, median, and mode are all equal.  Question 15 1.75 out of 1.75 points Two common ways of displaying categorical data is column charts and pie charts. True  Question 16 1.75 out of 1.75 points A sample, selected from a population, taken at one particular point in time is categorized as c. cross-sectional.  Question 17 1.75 out of 1.75 points If a value represents the 95 th percentile, this means that 95% of all values in the data set are _____this value. d. less than or equal to  Question 18 1.75 out of 1.75 points The mean of a data set is 75 and one observation has the value of 65. What is the squared deviation of the observation, 65, from the mean ? b. 100  Question 19 1.75 out of 1.75 points Both ordinal and nominal variables are categorical. True

 Question 20 1.75 out of 1.75 points A variable (or field or attribute) is a characteristic of members of a population, whereas an observation (or case or record) is a list of all variable values for a single member of a population. True 2 nd Attempt  Question 1 1.75 out of 1.75 points The average score for a class of 30 students was 75. The 20 male students in the class averaged 70. The average score of the 10 female students in the class is _____ the males.  Question 2 1.75 out of 1.75 points Data can be categorized as cross-sectional or time series.  Question 3 1.75 out of 1.75 points In a box plot, the asterisk inside the box indicates the location of the  Question 4 1.75 out of 1.75 points Both ordinal and nominal variables are categorical.  Question 5 1.75 out of 1.75 points What are the three most common measures of central tendency?  Question 6 1.75 out of 1.75 points A histogram that is positively skewed may also be described as  Question 7 1.75 out of 1.75 points Mean absolute deviation (MAD) is the average of the squared deviations.  Question 8 1.75 out of 1.75 points The median can also be described as the  Question 9 1.75 out of 1.75 points The mean of a data set is 75 and one observation has the value of 65. What is the squared deviation of the observation, 65, from the mean?

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 Question 10 1.75 out of 1.75 points A population includes all elements or objects of interest in a study, whereas a sample is a subset of the population used to gain insights into the characteristics of the population.  Question 11 1.75 out of 1.75 points In order for the characteristics of a sample to be generalized to the entire population, the sample should be _____ the population.  Question 12 1.75 out of 1.75 points Coding males as 1 and females as 0 in a data set illustrates the use of _____ variables.  Question 13 1.75 out of 1.75 points The interquartile range (IQR) encompasses what percent of the observations?  Question 14 1.75 out of 1.75 points If a value represents the 95 th percentile, this means that 95% of all values in the data set are _____this value.  Question 15 1.75 out of 1.75 points The length of the box in the box plot portrays the  Question 16 1.75 out of 1.75 points Where will you find "time" on a time series graph?  Question 17 1.75 out of 1.75 points In an extremely right-skewed distribution, the mean is less than the median.  Question 18 1.75 out of 1.75 points Categorical variables can be classified as either discrete or continuous.  Question 19 1.75 out of 1.75 points The mean is a measure of central tendency.  Question 20 1.75 out of 1.75 points What is the most common type of chart for showing the distribution of a numerical variable?