MATH 225N WEEK 7 HYPOTHESIS TESTING
ACTUAL TEST PAPER 2026 QUESTIONS
ANSWERS SOLUTIONS GRADED A+
◉ Sample Statistic. Answer: a numerical descriptive measure of a
sample (calculated from the observations in the sample). This is an
estimator of the population parameter.
◉ Inferential Statistics:Confidence Intervals. Answer: A set of most
likely values for an unknown parameter
◉ Inferential Statistics:Hypothesis Testing. Answer: A way to judge
the likelihood of a presumed value for a parameter
◉ Point estimate. Answer: Single value that serves as an estimate of
a population parameter. The best guess we can give. Can be the
sample mean
◉ Probably. Answer: Confidence Level
◉ Close. Answer: Margin of Error
, ◉ Confidence Interval. Answer: A set of most likely values of an
unknown parameter. This is an interval defined by two endpoints.
point estimate ± margin of error
◉ margin of error. Answer: A value that accounts for some chosen
percentage of natural variation.
◉ Critical Value. Answer: x(bar) +- za/2 x standarddev/sqrt(n)
◉ 90%. Answer: 1.645 we are 90% confident
◉ 95%. Answer: 1.96 we are 95% confident (zscores or values when
you know the confidence interval).
◉ Yes. Answer: Answer should be between to variables. 114.94
109.06
◉ 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
ACTUAL TEST PAPER 2026 QUESTIONS
ANSWERS SOLUTIONS GRADED A+
◉ Sample Statistic. Answer: a numerical descriptive measure of a
sample (calculated from the observations in the sample). This is an
estimator of the population parameter.
◉ Inferential Statistics:Confidence Intervals. Answer: A set of most
likely values for an unknown parameter
◉ Inferential Statistics:Hypothesis Testing. Answer: A way to judge
the likelihood of a presumed value for a parameter
◉ Point estimate. Answer: Single value that serves as an estimate of
a population parameter. The best guess we can give. Can be the
sample mean
◉ Probably. Answer: Confidence Level
◉ Close. Answer: Margin of Error
, ◉ Confidence Interval. Answer: A set of most likely values of an
unknown parameter. This is an interval defined by two endpoints.
point estimate ± margin of error
◉ margin of error. Answer: A value that accounts for some chosen
percentage of natural variation.
◉ Critical Value. Answer: x(bar) +- za/2 x standarddev/sqrt(n)
◉ 90%. Answer: 1.645 we are 90% confident
◉ 95%. Answer: 1.96 we are 95% confident (zscores or values when
you know the confidence interval).
◉ Yes. Answer: Answer should be between to variables. 114.94
109.06
◉ 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
