MAT 202 PRACTICE FINAL EXAM LATEST 2026 UPDATED
QUESTIONS AND VERIFIED 100% SOLUTIONS (2026/2027) |A+
GRADED |GUARANTEED PASS
A researcher performs a two-tailed test of the hypothesis that a sample mean is greater than
zero at the 90% confidence level. The population variance is known. What is the critical value of
the z-statistic? - Answers -1.65
The z-statistic of z=1.65 would result in a confidence level of 90.1%, because the area under the
normal curve between z=0 and z=1.65 corresponds an area of 0.4505. This is as close to a 90%
confidence level as a table with only two decimal places for z allows.
The dean at a university believes that the grade point average varies across freshman,
sophomore, junior, and senior years. She takes a random sample of 25 students from each year
and looks up their grades. The null hypothesis is
H0: µ₁=µ₂=µ₃
If she is going to use one-way analysis of variance (ANOVA), what will her alternative hypothesis
Text
be? - Answers -Not all of the means are equal
A researcher finds a significant statistical association between aggressive behavior and poor
grades among middle school students. What is one difficulty in interpreting this finding? -
Answers -The direction of causality is unclear.
1|Page
QUESTIONS AND VERIFIED 100% SOLUTIONS (2026/2027) |A+
GRADED |GUARANTEED PASS
A researcher performs a two-tailed test of the hypothesis that a sample mean is greater than
zero at the 90% confidence level. The population variance is known. What is the critical value of
the z-statistic? - Answers -1.65
The z-statistic of z=1.65 would result in a confidence level of 90.1%, because the area under the
normal curve between z=0 and z=1.65 corresponds an area of 0.4505. This is as close to a 90%
confidence level as a table with only two decimal places for z allows.
The dean at a university believes that the grade point average varies across freshman,
sophomore, junior, and senior years. She takes a random sample of 25 students from each year
and looks up their grades. The null hypothesis is
H0: µ₁=µ₂=µ₃
If she is going to use one-way analysis of variance (ANOVA), what will her alternative hypothesis
Text
be? - Answers -Not all of the means are equal
A researcher finds a significant statistical association between aggressive behavior and poor
grades among middle school students. What is one difficulty in interpreting this finding? -
Answers -The direction of causality is unclear.
1|Page
