Houses A real estate agent claims that all things being equal, houses with swimming pools tend to sell for less than those without swimming pools. What does this statement mean ? (Pick the best choice.) a. There are fewer homes with swimming pools than without. b. The typical price for homes with pools is smaller than the typical price for homes without pools. c. There’s more variability in the price of homes with pools than in the price of those without. d. The most expensive houses sold do not have pools.
Houses A real estate agent claims that all things being equal, houses with swimming pools tend to sell for less than those without swimming pools. What does this statement mean ? (Pick the best choice.) a. There are fewer homes with swimming pools than without. b. The typical price for homes with pools is smaller than the typical price for homes without pools. c. There’s more variability in the price of homes with pools than in the price of those without. d. The most expensive houses sold do not have pools.
Houses A real estate agent claims that all things being equal, houses with swimming pools tend to sell for less than those without swimming pools. What does this statement mean? (Pick the best choice.)
a. There are fewer homes with swimming pools than without.
b. The typical price for homes with pools is smaller than the typical price for homes without pools.
c. There’s more variability in the price of homes with pools than in the price of those without.
d. The most expensive houses sold do not have pools.
Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...
a small pond contains eight catfish and six bluegill. If seven fish are caught at random, what is the probability that exactly five catfish have been caught?
23 The line graph in the following figure shows
Revenue ($ millions)
one company's revenues over time. Explain
why this graph is misleading and what you
can do to fix the problem.
700
60-
50-
40
30
Line Graph of Revenue
20-
101
1950
1970
1975 1980 1985
Year
1990
2000
d of the
20
respectively.
Interpret the shape, center and spread of the
following box plot.
14
13
12
11
10
6
T
89
7
9
5.
治
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