HCD 300 BIOSTATS EXAM 2 REVIEW QUESTIONS
A description of how peak or flat a distribution is. - Answers - What is the kurtosis?
The percent of the distribution that falls within one standard deviation of the normally
distributed mean. - Answers - What is 68%?
A distribution where the median is less than the mean is considered ______ _______. -
Answers - What is positively skewed?
We use this to standardize a score (from a sample greater than 30) under a normal
distribution. - Answers - 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 - Answers - 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. - Answers - What
is a two-tailed test?
This is the type of error a researcher risks if they fail to reject the null. - Answers - 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. - Answers - 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. - Answers - What is reject the null? (p.
244-246)
Critical value 1.96 & test statistic 2.38
The process of hypothesis testing starts with this assumption. - Answers - What is the
'null hypothesis is true'?
In terms of significance, this is when we fail to reject the null. - Answers - What is when
the results are NOT significant.
This is how we determine significance with a test statistic. - Answers - What is compare
the test statistic to the critical value?
This is what we call findings which may change our clinical or community practice. -
Answers - What are clinically or practically significant results?
A description of how peak or flat a distribution is. - Answers - What is the kurtosis?
The percent of the distribution that falls within one standard deviation of the normally
distributed mean. - Answers - What is 68%?
A distribution where the median is less than the mean is considered ______ _______. -
Answers - What is positively skewed?
We use this to standardize a score (from a sample greater than 30) under a normal
distribution. - Answers - 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 - Answers - 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. - Answers - What
is a two-tailed test?
This is the type of error a researcher risks if they fail to reject the null. - Answers - 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. - Answers - 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. - Answers - What is reject the null? (p.
244-246)
Critical value 1.96 & test statistic 2.38
The process of hypothesis testing starts with this assumption. - Answers - What is the
'null hypothesis is true'?
In terms of significance, this is when we fail to reject the null. - Answers - What is when
the results are NOT significant.
This is how we determine significance with a test statistic. - Answers - What is compare
the test statistic to the critical value?
This is what we call findings which may change our clinical or community practice. -
Answers - What are clinically or practically significant results?
