With a single-sample t ratio, the null hypothesis states that
a. the sample mean could readily be part of the same distribution whose overall mean is
already known.
b. the sample mean in all likelihood could not be part of the same
distribution whose overall mean is already known
c. the sample mean and the population mean are significantly different values
d. none of these, since the null hypothesis always assumes that at least two sample means
have been obtained
a
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A correlation coefficient shows that smoking and life expectancy are indeed related. As a result, a researcher could predict _____________ if the direction of the relationship is known
a) if a person smokes a lot of cigarettes, he or she will have less money monthly to buy gas b) the person's life expectancy will go up or down based on the number of cigarettes the person smokes daily c) if a person smokes cigarettes, he or she will eventually develop lung cancer d) a person's lungs will repair themselves and he or she will live a longer life