TABLE 9-11
An appliance manufacturer claims to have developed a compact microwave oven that
consumes a population mean of no more than 250 W. From previous studies, it is
believed that power consumption for microwave ovens is normally distributed with a
population standard deviation of 15 W. If there is evidence that the population mean
consumption is greater than 250 W, the manufacturer will be unable to make the claim.
Referring to Table 9-11, if you select a sample of 20 compact microwave ovens and are
willing to have a level of significance of 0.01, the probability of making a Type II error
is ________ if the mean power consumption of all such microwave ovens is in fact 248
W.
TABLE 17-12
The marketing manager for a nationally franchised lawn service company would like to
study the characteristics that differentiate home owners who do and do not have a lawn
service. A random sample of 30 home owners located in a suburban area near a large
city was selected; 15 did not have a lawn service (code 0) and 15 had a lawn service
(code 1). Additional information available concerning these 30 home owners includes
family income (Income, in thousands of dollars), lawn size (Lawn Size, in thousands of
square feet), attitude toward outdoor recreational activities (Attitude 0 = unfavorable, 1
= favorable), number of teenagers in the household (Teenager), and age of the head of
the household (Age).
The Minitab output is given below:
Referring to Table 17-12, what is the p-value of the test statistic when testing whether
the model is a good-fitting model?
TABLE 3-10
The population of eight analysts at a software firm were asked to estimate the reuse rate
when developing a new software system. The following data are given as a percentage
of the total code written for a software system that is part of the reuse database.
50, 62.5, 37.5, 75.0, 45.0, 47.5, 15.0, 25.0
Referring to Table 3-10, what are the variance and standard deviation of the total code
that is part of the reuse database?
________ results from the failure to collect data on all subjects in the sample.
The owner of a fish market determined that the average weight for a catfish is 3.2
pounds with a standard deviation of 0.8 pound. Assuming the weights of catfish are
normally distributed, the probability that a randomly selected catfish will weigh less
than 2.2 pounds is ________.