STA 100 Midterm 2 Exam – Latest Update (100% Solved, Graded A+ Verified)

STA 100 MIDTERM 2 EXAM TEST LATEST
UPDATE WITH 100% SOLVED -GRADED A+
VERIFIED 2026 - 2027 UPDATE


1 sided Hypothesis Test - correct answer- HO: μ1 ≤ μ2 vs.
HA: μ1 > μ2


HO: μ1 ≥ μ2 vs. HA: μ1 < μ2


2 sided Hypothesis Test - correct answer- HO: μ1 = μ2 vs.
HA: μ1 ≠ μ2


3 Interpretations for comparing 2 means - correct answer-
1. Both bounds are below zero( μ1 < μ2) Group 1 has a smaller
average than group 2


2. Both bounds are above zero. (μ1 > μ2) Group 1 has a larger
average than group 2


3. The bounds cover zero. This means 0 is a possible value- no
significant difference between the means

, Alternative Hypothesis - correct answer- What must be
true if the null is not, and so is the opposite of the null.
Denoted HA.


Assumptions for a Confidence Interval - correct answer-
1. Random sample was taken
2. Y bar must be distributed normal because n ≥ 30 or
population is normal


If n is smaller than 30, we need a normal population.


Assumptions for Comparing 2 means - correct answer- 1.
A random sample was taken from both populations


2. Populations 1 and 2 are independent


3. Sample mean 1 and 2 are normally distributed, either because
N 1 and 2 are bigger than 30 or the populations are normally
distributed