1.1 The following measurements were recorded for
the drying time, in hours, of a certain brand of latex
paint.
3.4 2.5 4.8 2.9 3.6
2.8 3.3 5.6 3.7 2.8
4.4 4.0 5.2 3.0 4.8
Assume that the measurements are a simple random
sample.
(a) What is the sample size for the above sample?
(b) Calculate the sample mean for these data.
(c) Calculate the sample median.
(d) Plot the data by way of a dot plot.
(e) Compute the 20% trimmed mean for the above
data set.
(f) Is the sample mean for these data more or less descriptive
as a center of location than the trimmed
mean?

1.7 Consider the drying time data for Exercise 1.1
on page 13. Compute the sample variance and sample
standard deviation.

1.13 A manufacturer of electronic components is interested
in determining the lifetime of a certain type
of battery. A sample, in hours of life, is as follows:
123, 116, 122, 110, 175, 126, 125, 111, 118, 117.
(a) Find the sample mean and median.
(b) What feature in this data set is responsible for the
substantial difference between the two?

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