HCD 300 BioStats Exam 2 Review
UPDATED QUESTIONS AND CORRECT
ANSWERS
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)?
This is the experimental conclusion a researcher would make if the p value is .24 when alpha is set at
.05. - CORRECT ANSWER What is fail to reject the null?
This is the experimental conclusion a researcher would make if the two-tailed z-test statistic is 2.38
when alpha is set at the .05 level. - CORRECT ANSWER What is reject the null? (p. 244-246)
UPDATED QUESTIONS AND CORRECT
ANSWERS
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)?
This is the experimental conclusion a researcher would make if the p value is .24 when alpha is set at
.05. - CORRECT ANSWER What is fail to reject the null?
This is the experimental conclusion a researcher would make if the two-tailed z-test statistic is 2.38
when alpha is set at the .05 level. - CORRECT ANSWER What is reject the null? (p. 244-246)
