BIOSTATS EXAM 2 REVIEW WITH ALL CORRECT &
VERIFIED ANSWERS/ALREADY GRADED A+
The constant used when calculating the 99% CI of the mean of 10 in a sample of 6 with a SD of 2:
Correct answer-4.032
The obtained value of a two-tailed one-sample z-test is 2.5 (alpha=0.01): Correct answer-Critical
value +/-2.576= fail to reject null
A description of how peaked or flat a distribution is: Correct answer-Kurtosis
True or False: Symmetrical distribution has a skew of 0. Correct answer-True
This is the % of the distribution that falls within one standard deviation of the normally distributed
mean: Correct answer-68%
A distribution where the median is less than the mean is considered _________. Correct answer-
Positively skewed
When a sample is greater than 30 we use this to standardize a score: Correct answer-Z-score
The probability of a score greater than 115 on a normally distributed test with a mean 100 and SD of
10: Correct answer-6.68%
True or False: Non-directional hypothesis= one-tailed test Correct answer-False
The probability of a score less than 115 on a normally distributed test with a mean of 100 and a SD of
10: Correct answer-93.32%
This is the type of error a researcher risks if they fail to reject the null: Correct answer-Type II
P-value=0.24 (alpha=0.05) what is statistical conclusion? Correct answer-Fail to reject the null; this
is not a significant result
Z-test statistic is 2.38 (alpha 0.05) what is statistical conclusion? Correct answer-Critical value +/-
1.96 reject the null
The process of hypothesis testing starts with this assumption: Correct answer-The null hypothesis
is true
This is when we fail to reject the null: Correct answer--results are not significant
-p-value is greater than alpha
True or False: The test statistic also called the obtained value. Correct answer-True
Determining significance: compare obtained value to _______ Correct answer-critical value
If we change our clinical practice as a result of findings we have ________. Correct answer-clinical
significance
Determining significance: compare p-value to_________. Correct answer-alpha
VERIFIED ANSWERS/ALREADY GRADED A+
The constant used when calculating the 99% CI of the mean of 10 in a sample of 6 with a SD of 2:
Correct answer-4.032
The obtained value of a two-tailed one-sample z-test is 2.5 (alpha=0.01): Correct answer-Critical
value +/-2.576= fail to reject null
A description of how peaked or flat a distribution is: Correct answer-Kurtosis
True or False: Symmetrical distribution has a skew of 0. Correct answer-True
This is the % of the distribution that falls within one standard deviation of the normally distributed
mean: Correct answer-68%
A distribution where the median is less than the mean is considered _________. Correct answer-
Positively skewed
When a sample is greater than 30 we use this to standardize a score: Correct answer-Z-score
The probability of a score greater than 115 on a normally distributed test with a mean 100 and SD of
10: Correct answer-6.68%
True or False: Non-directional hypothesis= one-tailed test Correct answer-False
The probability of a score less than 115 on a normally distributed test with a mean of 100 and a SD of
10: Correct answer-93.32%
This is the type of error a researcher risks if they fail to reject the null: Correct answer-Type II
P-value=0.24 (alpha=0.05) what is statistical conclusion? Correct answer-Fail to reject the null; this
is not a significant result
Z-test statistic is 2.38 (alpha 0.05) what is statistical conclusion? Correct answer-Critical value +/-
1.96 reject the null
The process of hypothesis testing starts with this assumption: Correct answer-The null hypothesis
is true
This is when we fail to reject the null: Correct answer--results are not significant
-p-value is greater than alpha
True or False: The test statistic also called the obtained value. Correct answer-True
Determining significance: compare obtained value to _______ Correct answer-critical value
If we change our clinical practice as a result of findings we have ________. Correct answer-clinical
significance
Determining significance: compare p-value to_________. Correct answer-alpha
