## PSYC 354 Quiz 5 Probability

**PSYC 354 Quiz 5 Probability **

- The tail is on the right side of a normal distribution for any
*z*-score value greater than zero. - All probabilities can be expressed as decimal values ranging from 0.00 to 1.00.
- The symbol
*p*refers to percentage. - When finding percentile ranks for a percentile, the focus is always on identifying the percentile rank on the left side of a percentile.
- 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. - Which of the following is a requirement for a random sample?
- Equal chance and constant probability are essential aspects of random sampling that are conducive to using probability.
- 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. - Which statement accurately describes the proportions in the tails of a normal distribution?
- What is the probability of randomly selecting a
*z*-score greater than*z*= –0.75 from a normal distribution? - A population is normally distributed with μ = 145 and
*σ*= 20. Which is the percentile rank for*X*= 171? - 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? - 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? - Which proportion of a normal distribution is located in the tail above
*z*= +1.50?