PSYC 354 Quiz 5 Probability

PSYC 354 Quiz 5 Probability

1. The tail is on the right side of a normal distribution for any z-score value greater than zero.
2. All probabilities can be expressed as decimal values ranging from 0.00 to 1.00.
3. The symbol p refers to percentage.
4. When finding percentile ranks for a percentile, the focus is always on identifying the percentile rank on the left side of a percentile.
5. A vertical line drawn through a normal distribution at z = –0.72 separates the distribution into two sections. The proportion in the smaller section is 0.2358.
6. Which of the following is a requirement for a random sample?
7. Equal chance and constant probability are essential aspects of random sampling that are conducive to using probability.
8. A vertical line drawn through a normal distribution at z = +1.40 divides the distribution into two sections. The proportion in the smaller section is 0.0808.
9. Which statement accurately describes the proportions in the tails of a normal distribution?
10. What is the probability of randomly selecting a z-score greater than z = –0.75 from a normal distribution?
11. A population is normally distributed with μ = 145 and σ = 20. Which is the percentile rank for X = 171?
12. A normal distribution has a mean of μ = 40 with σ = 8. If one score is randomly selected from this distribution, which is the probability that the score will be less than X = 34?
13. Mitchell is getting ready to take a baseball rules exam in order to become certified as a baseball umpire in his local community. Past scores on the rules exam form a normal distribution with μ = 80 and σ = 6. Mitchell must score in the highest 25% of the distribution in order to become a certified umpire. Which minimum score does Mitchell need to obtain on the rules exam to become a certified umpire?
14. Which proportion of a normal distribution is located in the tail above z = +1.50?