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Chapter 9: Q.10 (page 546)
In planning a study of the birth weights of babies whose mothers did not see a
doctor before delivery, a researcher states the hypotheses as
The problem is incorrect as the population mean value is as per the null hypothesis and is less than as per the alternative hypothesis.
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A significance test allows you to reject a null hypothesis in favor of an alternative at the significance level. What can you say about significance at the level?
(a) can be rejected at the significance level.
(b) There is insufficient evidence to reject at the significance level.
c) There is sufficient evidence to accept at the significance level.
(d) Ha can be rejected at the significance level.
(e) The answer can鈥檛 be determined from the information given
An opinion poll asks a random sample of adults whether they favor banning ownership of handguns by private citizens. A commentator believes that more than half of all adults favor such a ban. The null and alternative hypotheses you would use to test this claim are
a).
(b)
(c)
(d)
(e)
During the winter months, the temperatures at the Colorado cabin owned by the Starnes family can stay well below freezing (32掳F or 0掳C) for weeks at a time. To prevent the pipes from freezing, Mrs Starnes sets the thermostat at 50掳F. The manufacturer claims that the thermostat allows variation in-home temperature of S 3掳F. Mrs Starnes suspects that the manufacturer is overstating how well the thermostat works.
Describe a Type I error in this setting.
The most important condition for sound conclusions from statistical inference is that
(a) the data come from a well-designed random sample or randomized experiment
(b) the population distribution be exactly Normal.
(c) the data contain no outliers.
(d) the sample size be no more than of the population size.
(c) the sample size be at least .
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