Phase 3: Introduction to hypothesis testing
A hypothesis test of means that compares the variance between groups to the variance within groups is:
ANOVA
The power value represents the:
Ability of the test to detect a difference if there is one
a chi-square test is used with what type of data?
Discrete
With Normal data, the test used to compare the difference in variability in two processes is the...
F-test
Which of the following statements is true if the p-value is >0.05?
Fail to reject the null hypothesis
Which of the following statements is NOT true regarding p-value?
If the p-value is less than or equal to 0.05, there is NOT a significant difference--fail to reject the Null hypothesis
Which one of the following statements are true about a 2 sample t-test
It is based on the difference between the distribution of averages, not the differences between individual observations
In hypothesis testing, which of the following is NOT true regarding a Type 1 error?
Occurs when there really is a difference but we miss it
The true test of significance is...
p-value
the "p" in p-value represents...
probability
If the p-value is less than or equal to 0.05...
reject the null hypothesis; determine there is a statistically significant difference
Which test represents the best choice if you wanted to compare the average mean Time to Repair (MTTR) of your office for the last month to the division's MTTR?
1- sample t-test
Which hypothesis test is appropriate for comparing two sample means?
2 sample t-test
When running a Test of Equal Variance for Normal data, which test statistic is read when you are comparing several samples?
Bartlett's test
Which of the following hypothesis tests is appropriate for use with discrete data?
Chi-square test
Which test represents the best choice if you want to see or determine if there is a difference in the ratio of call types between any of the call centers: A, B, C, D?
Chi-square test
a chi-square test creates a table that is known as...
Contingency table
Which test represents the best choice if you wanted to compare the average number of adjustments made by service representatives at five different locations in Texas?
One-way ANOVA
If we are working with discrete data and we want to compare three or more groups of data in categories, the appropriate test is...
chi-square test
A hypothesis test...
helps to determine if differences are statistically significant
Regarding the p-value, which of the following statements is false?
the p-value is a number between -1 and +1
If a statistical difference cannot be proven...
the practical difference should be considered
there are multiple types of hypothesis tests. What drives the selection of the proper test?
the type of data you are working with
