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Chapter 7: Q.8 (page 429)
How tall? A random sample of female college students has a mean height of inches, which is greater than the -inch mean height of all adult American women.
The value of
Statistic
Parameter .
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1) State whether it is a parameter or a statistic and (2)use appropriate notation to describe each
number; for example, p = 0.65.
Get your bearings A large container of ball bearings has mean diameter 2.5003 centimeters (cm). This is within the specifications for acceptance of the container by the purchaser. By chance, an inspector chooses 100 bearings from the container that have a mean diameter of 2.5009 cm. Because this is outside the
For Exercises 1 to 4, identify the population, the parameter, the sample, and the statistic in each setting
Hot turkey Tom is cooking a large turkey breast for a holiday meal. He wants to be sure that the turkey is safe to eat, which requires a minimum internal temperature of . Tom uses a thermometer to measure the temperature of the turkey meat at four randomly chosen points. The minimum reading in the sample is
According to the U.S. census, the proportion of adults in a certain county who owned their own home was . An SRS of adults in a certain section of the county found that owned their home. Which one
of the following represents the approximate probability of obtaining a sample of adults in which fewer than own their home, assuming that this section of the county has the same overall proportion of adults who own their home as does the entire county?
(a)
(b)
(c)
(d)
(e)
Cold cabin? The Fathom screenshot below shows the results of taking SRSs of temperature readings from a population distribution that’s and recording the sample minimum each time.
(a) Describe the approximate sampling distribution.
(b) Suppose that the minimum of an actual sample is . What would you conclude about the thermostat manufacturer’s claim? Explain.
The number of undergraduates at Johns Hopkins University is approximately , while the number at Ohio State University is approximately . At both schools, a simple random sample of about of the undergraduates is taken. Each sample is used to estimate the proportion p of all students at that university who own an iPod. Suppose that, in fact, at both schools. Which of the following is the best conclusion?
(a) The estimate from Johns Hopkins has less sampling variability than that from Ohio State.
(b) The estimate from Johns Hopkins has more sampling variability than that from Ohio State.
(c) The two estimates have about the same amount of sampling variability.
(d) It is impossible to make any statement about the sampling variability of the two estimates since the students surveyed were different.
(e) None of the above
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