STATS EXAM GRIND Exam Question And
Answers 2025
Who is sus? - correct answers✅David
Who is really sus? - correct answers✅Dhivyan
12.1 - correct answers✅a. A statistics practitioner took a
random sample of size 56. The sample mean and standard
deviation are 70 and 12, respectively. b. Determine the 95%
confidence interval estimate of the population mean. c.
Repeat part (a) changing the sample mean to 30. d. Describe
what happens to the width of the interval when the sample
mean decreases.
12.2 - correct answers✅a. The mean and standard deviation
of a sample of 25 is 50 and 10, respectively. a. Estimate the
population mean with 90% confidence. b. Repeat part (a)
changing the sample mean to 100. c. Describe what happens
to the width of the interval when the sample mean increases.
12.3 - correct answers✅a. A random sample of 25 was drawn
from a population. The sample mean and standard deviation
are x = 510 and s = 125. Estimate μ with 95% confidence. b.
Repeat part (a) with n = 50.
