MATH 225N STATISTICS FINAL EXAM
CHAMBERLAIN COLLEGE OF NURSING
EXAMINATION TEST 2026 COMPLETE
QUESTIONS AND SOLUTIONS GRADED A+
⩥ For the study in the previous question, the value of for the regression
line was 0.05 pounds. Interpret this statistic. Answer: As percent
compliance goes up by 1 percent, the average weight lost in three
months increases by 0.05 pounds.
⩥ A manufacturer claims that the thickness of the spearmint gum it
produces is 7.5 one-hundredths of an inch. A quality control specialist
regularly checks this claim. From his experience, the specialist knows
the distribution is right skewed and that the standard deviation is 0.4
one-hundredths of an inch. On one production run, he took a random
sample of n = 100 pieces of gum and measured their thickness. Which
hypothesis test would be most appropriate for this task? Answer: One
mean (sigma known)
⩥ An attorney is investigating whether it is plausible that the percentage
of Wal-Mart employees in Nevada who are over 45 years old is 30%.
Which confidence interval would be most appropriate in this situation?
Answer: One proportion
, ⩥ A marriage counselor conducted a study of couples, categorizing each
of the couples as "communicative" or "non-communicative". Among
other things, the counselor wanted to see whether the percentage of
communicative couples whose marriage ended in separation or divorce
was greater than the percentage of non-communicative couples whose
marriage ended in separation or divorce. Which hypothesis test would be
most appropriate for this study? Answer: Difference of two proportions
⩥ A business marketing firm specializes in radio advertising. They hope
to show there is a linear relationship between sales and the amount of
money a client invests in radio advertising. Which hypothesis test would
be most appropriate for addressing this question? Answer: Slope of the
regression line
⩥ Which one of the following best describes the notion of "the
significance level of a hypothesis test?" Answer: The probability of a
type I error.
⩥ The heights of young adult females in the United States are said to
have a population standard deviation of inches. A sample was taken of
young adult females at BYU-Idaho and the mean was computed to be
inches. A 95% confidence interval for the true mean height of females in
the United States was calculated from the BYU-Idaho sample data.
Which of the following explanations describes the correct way to
interpret the 95% confidence interval for this problem? Answer:
Approximately 95% of all 95% confidence intervals that could be
CHAMBERLAIN COLLEGE OF NURSING
EXAMINATION TEST 2026 COMPLETE
QUESTIONS AND SOLUTIONS GRADED A+
⩥ For the study in the previous question, the value of for the regression
line was 0.05 pounds. Interpret this statistic. Answer: As percent
compliance goes up by 1 percent, the average weight lost in three
months increases by 0.05 pounds.
⩥ A manufacturer claims that the thickness of the spearmint gum it
produces is 7.5 one-hundredths of an inch. A quality control specialist
regularly checks this claim. From his experience, the specialist knows
the distribution is right skewed and that the standard deviation is 0.4
one-hundredths of an inch. On one production run, he took a random
sample of n = 100 pieces of gum and measured their thickness. Which
hypothesis test would be most appropriate for this task? Answer: One
mean (sigma known)
⩥ An attorney is investigating whether it is plausible that the percentage
of Wal-Mart employees in Nevada who are over 45 years old is 30%.
Which confidence interval would be most appropriate in this situation?
Answer: One proportion
, ⩥ A marriage counselor conducted a study of couples, categorizing each
of the couples as "communicative" or "non-communicative". Among
other things, the counselor wanted to see whether the percentage of
communicative couples whose marriage ended in separation or divorce
was greater than the percentage of non-communicative couples whose
marriage ended in separation or divorce. Which hypothesis test would be
most appropriate for this study? Answer: Difference of two proportions
⩥ A business marketing firm specializes in radio advertising. They hope
to show there is a linear relationship between sales and the amount of
money a client invests in radio advertising. Which hypothesis test would
be most appropriate for addressing this question? Answer: Slope of the
regression line
⩥ Which one of the following best describes the notion of "the
significance level of a hypothesis test?" Answer: The probability of a
type I error.
⩥ The heights of young adult females in the United States are said to
have a population standard deviation of inches. A sample was taken of
young adult females at BYU-Idaho and the mean was computed to be
inches. A 95% confidence interval for the true mean height of females in
the United States was calculated from the BYU-Idaho sample data.
Which of the following explanations describes the correct way to
interpret the 95% confidence interval for this problem? Answer:
Approximately 95% of all 95% confidence intervals that could be
