HCD 300 Bio Stats exam 2 review
Question and answers rated A+ 2025
A description of how peak or flat a distribution is. - correct answer ✔What is
the kurtosis?
The percent of the distribution that falls within one standard deviation of the
normally distributed mean. - correct answer ✔What is 68%?
A distribution where the median is less than the mean is considered ______
_______. - correct answer ✔What is positively skewed?
We use this to standardize a score (from a sample greater than 30) under a
normal distribution. - correct answer ✔What is a z score? Z=(X-U)/(up side
down Q)
The probability of a score greater than 115 on a normally distributed test with
a mean of 100 and standard deviation of 10 - correct answer ✔What is
6.68%
Z score = (115-100)/10 =1.5
Area between mean and z for 1.5 = 43.32
50-43.32 = 6.68% (we want the area to the right of the z score)
This is what the test of a non-directional research hypothesis is called. -
correct answer ✔What is a two-tailed test?
This is the type of error a researcher risks if they fail to reject the null. - correct
answer ✔What is a type II error (p. 225-226)?
