The lengths of a particular animal's pregnancies are approximately normally distributed, with mean \( \mu=266 \) days and standard deviation \( \sigma=16 \) days. (a) What proportion of pregnancies lasts more than 274 days? (b) What proportion of pregnancies lasts between 242 and 270 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 238 days? (d) A "very preterm" baby is one whose gestation period is less than 230 days. Are very preterm babies unusual? (a) The proportion of pregnancies that last more than 274 days is (Round to four decimal places as needed.)

What do correlations less than zero signify? A that the relationship between the variables is negative B correlation statistic can't have negative value (C) We need to square the correlations to get rid of the negative numbers (D) There is an error made

(a) The percentage of infected people reaches a maximum after 11 days. (Simplify your answer.) (b) The maximum percent of the population infected is \( \square \% \). (Round to the nearest hundredth as needed.)

What is the test statistic for correlation? (A) i (B) F (D) z (D)

The sign of the correlation indicates whether the correlation between the independent variable and dependent variable is negative or positive (A) True (B) False

The appropriate degrees of freedom for the distribution used in correlation is \( \mathrm{df}=\mathrm{N}-\mathrm{k} \). (A) True (B) False