Chapter 1: Q 102. (page 73)
Which of the distributions shown has a larger standard deviation? Justify your answer.
Short Answer
The graph of a variable will have a higher standard deviation.
Chapter 1: Q 102. (page 73)
Which of the distributions shown has a larger standard deviation? Justify your answer.
The graph of a variable will have a higher standard deviation.
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Get started for freeWhat do they measure? For each of the following summary statistics, decide (i) whether it could be used to measure center or spread and (ii) whether it is resistant.
(a)
(b)
At the Census Bureau Web site, you can view detailed data collected by the American Community Survey. The table below includes data for 10 people chosen at random from the more than one million people in households contacted by the survey. “School” gives the highest level of education completed.
This data set contains
(a) 7 variables, 2 of which are categorical.
(b) 7 variables, 1 of which is categorical.
(c) 6 variables, 2 of which are categorical.
(d) 6 variables, 1 of which is categorical.
(e) None of these.
You are preparing to study the television-viewing habits of high school students. Describe two categorical variables and two quantitative variables that you might record for each student. Give the units of measurement for the quantitative variables.
Phosphate levels The level of various substances in the blood influences our health. Here are measurements of the level of phosphate in the blood of a patient, in milligrams of phosphate per deciliter of blood, made on 6 consecutive visits to a clinic: 5.6, 5.2, 4.6, 4.9, 5.7, 6.4. A graph of only 6 observations gives little information, so we proceed to compute the mean and standard deviation. (a) Find the standard deviation from its definition. That is, find the deviations of each observation from the mean, square the deviations, then obtain the variance and the standard deviation. (b) Interpret the value of sx you obtained in (a)
You look at real estate ads for houses in Naples, Florida. There are many houses ranging from in price. The few houses on the water, however, have prices up to . The distribution of house prices will be
(a) skewed to the left.
(b) roughly symmetric.
(c) skewed to the right.
(d) unimodal.
(e) too high.
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