STT 200 Midterm Exam 2 Questions
with 100% Correct Answers
If the test is significantly significant then that means - Answer- you have to reject the null
hypothesis...so p-value is LESS than 0.05.
A variable tested is NOT INDEPENDENT of the another variable if ________ - Answer-
you FAIL to reject the null hypothesis
If the CI has a smaller width this means that - Answer- the sample size (n) is larger
IF the CI has a larger width this means that - Answer- the CL is higher
If you reject the null hypothesis (p-value was less than 0.05) - Answer- the test is
significant
If you FAIL to reject the null hypothesis (p-value is greater than 0.05) - Answer- the test
is NOT significant
"Provide an estimate of how far off, on average, you would expect this estimate to be"
means to find the - Answer- SE
How to calculate z score - Answer- (data point - mean)/ standard deviation
What does the z score mean? - Answer- a measure of how many standard deviations
below or above the population mean a raw score is
How to find the df for chi square test of independence (more than one column) -
Answer- df = (r-1)(c-1)
How to find P hat - Answer- observed/sample size (x/n)
"Provide an estimate of approximately how far we expect the point estimate from the
true difference in proportions p1-p2 on average." mean to find what? - Answer- pooled
standard error
How to find the expected count when there is only one column/category? - Answer-
Total Count/number of categories
with 100% Correct Answers
If the test is significantly significant then that means - Answer- you have to reject the null
hypothesis...so p-value is LESS than 0.05.
A variable tested is NOT INDEPENDENT of the another variable if ________ - Answer-
you FAIL to reject the null hypothesis
If the CI has a smaller width this means that - Answer- the sample size (n) is larger
IF the CI has a larger width this means that - Answer- the CL is higher
If you reject the null hypothesis (p-value was less than 0.05) - Answer- the test is
significant
If you FAIL to reject the null hypothesis (p-value is greater than 0.05) - Answer- the test
is NOT significant
"Provide an estimate of how far off, on average, you would expect this estimate to be"
means to find the - Answer- SE
How to calculate z score - Answer- (data point - mean)/ standard deviation
What does the z score mean? - Answer- a measure of how many standard deviations
below or above the population mean a raw score is
How to find the df for chi square test of independence (more than one column) -
Answer- df = (r-1)(c-1)
How to find P hat - Answer- observed/sample size (x/n)
"Provide an estimate of approximately how far we expect the point estimate from the
true difference in proportions p1-p2 on average." mean to find what? - Answer- pooled
standard error
How to find the expected count when there is only one column/category? - Answer-
Total Count/number of categories
