To study the effects of prenatal cocaine use on infants, on collects a random sample of...
To study the effects of prenatal cocaine use on infants, on collects a random sample of 120 weights of babies born to cocaine users that gives a mean of 2750 g and a standard deviation of 680 g. Use a 5% significance level to test the claim that weights of babies born to cocaine users have a mean that is less than 2800 g. Which one of the following is true?
Select one:
a. None of the other answers in necessary true.
b. The test statistic is -0.81 and the critical value is -1.96, hence we fail to reject the null hypothesis.
c. The test statistic is -1.96 and the critical value is -0.81, hence we reject the null hypothesis.
d. The test statistic is -1.64 and the critical value is -0.81, hence we reject the null hypothesis.
e. The test statistic is -0.81 and the critical value is -1.64, hence we fail to reject the null hypothesis.
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