Straighterline Statistics Final Exam Questions with Verified
Answers |2026/2027 Update | A+ Graded
A student performed a chi square test with 5° of freedom. What would be the critical value of
the chi square statistic, assuming a significance level of P< 0.05 - Answer -11.07
Withdrawn from a normal distribution, 95% of the sample means will fall within how many
standard deviations of the population - Answer -1.96
A maple syrup manufacturer asked 100 customers to rate its brand of maple syrup on a scale of
one to 10. The mean rating was seven, with a sample standard deviation of 1.5. Based on this
sample, what is the 95% confidence interval for the estimate of the population mean? - Answer
-(6.7, 7.3)
A regression analysis suggest that the number of children and employee has predicts the
number of personal days he/she will take off work. The life of the regression line is 3.2 and the
lower bound of the confidence interval for this slope is 0.8. What is the upper bound? - Answer
-5.6
A coach was just to determine whether her basketball team is performing worse this year than
in previous years. The coach knows that over the past several years games, the team scored an
average of 84 points in the last year, with 36 games, they scored an average of only 71 points,
with a standard deviation of 24 points. What T test statistic does this score correspond to? -
Answer --3.25
1|Page
, In a statistical analysis, how does the T distribution differ from the z distribution? - Answer -It
depends on sample size
In hypothesis testing, a type one error occurs when - Answer -A chance result is reported as
statistically significant
An analyst predicts that clients who use a certain investment strategy will have below average
profits. With a sample of 21 clients, the analyst performs a one tailed T test of this hypothesis at
the 95% confidence level, resulting in a statistic of -1.65. How should the analyst interpret the
result? - Answer -The null hypothesis is not rejected
A researcher test the hypothesis that math scores are significantly different between two groups
of students. The test yields a p value of 0.01. What is the correct interpretation of this value? -
Answer -The two score distributions have common values one percent of the time
A class of 25 students took a reading test before, and after completing an intensive vocabulary
course to determine whether there was a change in scores in either direction. The mean pretest
score was 24, and the mean post test score was 32. The standard deviation of the difference
was nine. What value of the T statistic does this difference correspond to? - Answer -4.4
A researcher wants to test the hypothesis that right handed people will have different visual,
acuity, and their left and right eyes. What sort of test should the researcher use? - Answer -One
tailed test with two independent samples
2|Page
Answers |2026/2027 Update | A+ Graded
A student performed a chi square test with 5° of freedom. What would be the critical value of
the chi square statistic, assuming a significance level of P< 0.05 - Answer -11.07
Withdrawn from a normal distribution, 95% of the sample means will fall within how many
standard deviations of the population - Answer -1.96
A maple syrup manufacturer asked 100 customers to rate its brand of maple syrup on a scale of
one to 10. The mean rating was seven, with a sample standard deviation of 1.5. Based on this
sample, what is the 95% confidence interval for the estimate of the population mean? - Answer
-(6.7, 7.3)
A regression analysis suggest that the number of children and employee has predicts the
number of personal days he/she will take off work. The life of the regression line is 3.2 and the
lower bound of the confidence interval for this slope is 0.8. What is the upper bound? - Answer
-5.6
A coach was just to determine whether her basketball team is performing worse this year than
in previous years. The coach knows that over the past several years games, the team scored an
average of 84 points in the last year, with 36 games, they scored an average of only 71 points,
with a standard deviation of 24 points. What T test statistic does this score correspond to? -
Answer --3.25
1|Page
, In a statistical analysis, how does the T distribution differ from the z distribution? - Answer -It
depends on sample size
In hypothesis testing, a type one error occurs when - Answer -A chance result is reported as
statistically significant
An analyst predicts that clients who use a certain investment strategy will have below average
profits. With a sample of 21 clients, the analyst performs a one tailed T test of this hypothesis at
the 95% confidence level, resulting in a statistic of -1.65. How should the analyst interpret the
result? - Answer -The null hypothesis is not rejected
A researcher test the hypothesis that math scores are significantly different between two groups
of students. The test yields a p value of 0.01. What is the correct interpretation of this value? -
Answer -The two score distributions have common values one percent of the time
A class of 25 students took a reading test before, and after completing an intensive vocabulary
course to determine whether there was a change in scores in either direction. The mean pretest
score was 24, and the mean post test score was 32. The standard deviation of the difference
was nine. What value of the T statistic does this difference correspond to? - Answer -4.4
A researcher wants to test the hypothesis that right handed people will have different visual,
acuity, and their left and right eyes. What sort of test should the researcher use? - Answer -One
tailed test with two independent samples
2|Page
