math stisctic 245

6 A propped frequency distribution of population that is called "normal" will Opically have which of the following shapes: Symmetric Skewed Rimodal a Uniform 7. Which of the following alternate hypothesis does not indicate a one-tailed test? aHA: P>0 b.HA: BRO CHA: A CO d.Ha: p-.25 8. A Professor claims that 75% of his students receive As and Bs in his class. There are 28 students in his classes this semester. You would like to find the probability that 19 will receive an A or a B. This distribution that would best be used to answer this question is which of the following? Binomial b. Normal . Bimodal d. Student's t 9. According to the Central Limit Theorem, even if the distribution you are taking a sample from is not normally distributed, the distribution of sample means will be approximately normal for large numbers. In practice, what sample size is usually large enough for this provision of the CLT to be adequate? a. 10 b. 30 c. 50 d. 100 10. For a normal distribution, P(z > 1.81) is: a. .0351 b. .0181 c. .9649 d. .9000