MATH 225N WEEK 7 HYPOTHESIS TESTING
COMPREHENSIVE SCRIPT 2026 FULL STUDY
GUIDE COMPLETE RESPONSES
◉ The center will always be the same regardless of confidence
interval. Answer: Yes
◉ STAT, TESTS, zinterval and click enter, Inpt scroll over Stats is
highlighted and click enter, Enter standard dev, sample mean,
sample size, and the confidence level, Scroll down to Calc and hit
enter. Answer: Directionas
◉ (x, y) ex. (63.81, 70.79). Answer: 98% confidence the mean of all
test scores is between those two digits.
◉ 100% confidence. Answer: =1
◉ A greater sample size. Answer: Will yield a high confidence level
and a smaller margin of error
◉ n = (Za|2 x standard dev/m)^2. Answer: Compute sample size.
Round up to nearest whole number. ALWAYS round UP.
, ◉ 138.2976. Answer: 139
◉ The formula we currently have. Answer: Incorperates Standard
Deviation
◉ Once we replace it with sample standard deviation. Answer: It is
no longer normal.
◉ Student's t distribution. Answer: When standard deviation is
unknown it is a t-distribution. Not zscore a tscore.
◉ t a|2 (tscore). Answer: data more spread out. characterized by
degrees of freedom.
◉ STAT, TESTS, TINTERVAL, Inpt Scroll to Stats until highlighter.
Answer: for T interval
◉ zinterval and tinterval. Answer: you would not round. ZINterval
when pop sd known. Tinterval when pop sd unknown
◉ 744.25, 756.15). Answer: We are 95% confident
◉ Qualitative. Answer: Categorical
COMPREHENSIVE SCRIPT 2026 FULL STUDY
GUIDE COMPLETE RESPONSES
◉ The center will always be the same regardless of confidence
interval. Answer: Yes
◉ STAT, TESTS, zinterval and click enter, Inpt scroll over Stats is
highlighted and click enter, Enter standard dev, sample mean,
sample size, and the confidence level, Scroll down to Calc and hit
enter. Answer: Directionas
◉ (x, y) ex. (63.81, 70.79). Answer: 98% confidence the mean of all
test scores is between those two digits.
◉ 100% confidence. Answer: =1
◉ A greater sample size. Answer: Will yield a high confidence level
and a smaller margin of error
◉ n = (Za|2 x standard dev/m)^2. Answer: Compute sample size.
Round up to nearest whole number. ALWAYS round UP.
, ◉ 138.2976. Answer: 139
◉ The formula we currently have. Answer: Incorperates Standard
Deviation
◉ Once we replace it with sample standard deviation. Answer: It is
no longer normal.
◉ Student's t distribution. Answer: When standard deviation is
unknown it is a t-distribution. Not zscore a tscore.
◉ t a|2 (tscore). Answer: data more spread out. characterized by
degrees of freedom.
◉ STAT, TESTS, TINTERVAL, Inpt Scroll to Stats until highlighter.
Answer: for T interval
◉ zinterval and tinterval. Answer: you would not round. ZINterval
when pop sd known. Tinterval when pop sd unknown
◉ 744.25, 756.15). Answer: We are 95% confident
◉ Qualitative. Answer: Categorical
