Chapter 9: Q.16 (page 547)
Asked to explain the meaning of “statistically significant at the A 0.05 level,” a
student says, “This means that the probability that the null hypothesis is true is less than 0.05.” Is this explanation correct? Why or why not?
The explanation is incorrect
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A change is made that should improve student satisfaction with the parking situation at a local high school. Right now, 37% of students approve of the parking that’s provided. The null hypothesis is tested against the alternative.
Which of the following 95% confidence intervals would lead us to reject in favor of at the 5% significance level?
(a) (0.29, 0.38) (c) (0.27, 0.31) (e) None of these
(b) (0.19, 0.27) (d) (0.24, 0.30)
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 .
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
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)
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